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Will Park City Mountain open before Nov 22, 2026?
70%
Agent
84%
Market Price
-14.4%
Edge
56%
Confidence
3,276
Volume
12.0c
Spread
51
Days to resolution
5
Markets in event
final rationale
Mean of 5 draws (0.71, 0.73, 0.74, 0.62, 0.68). (0) Not resolved: Ski Utah still lists Park City as 'Summer Open' with an anticipated Nov 20 opening as of Sept 30; a public lift must run by Nov 21 ET. (a) About seven weeks remain, and snowmaking typically starts in late October. (b) Status quo is the resort's Aug 18 target of Friday Nov 20, a one-day buffer before the deadline. Park City hit its target in about 5 of the last 7 seasons, missing in 2021 and 2025 by 7-14 days, so a repeat of that failure mode is a clean No. (c) No: a very strong El Niño (81% CPC odds) brings warm, rain-dominated storms in Oct-Nov per an NWS hydrologist, snowmaking stalls outside the 14-27F window, and opening slips to December as in 2025. (d) Yes: cold air arrives normally (late-September dustings at Snowbird and Brian Head), Vail's aggressive snowmaking builds a base, and the resort opens Nov 20 as in 2023's El Niño year (Nov 17). The market's 84% (74/86 spread) looks somewhat rich against the base rate, the El Niño headwinds and the thin margin, with no hard October data either way.
price vs. prediction
market price
agent forecast at t+0
17 follow-ups
1. Planner Opus 5.5 · picks the research tools
Tools chosen:
kalshi_direct
kalshi_related
resolution_source
article_search
wikipedia
Planner reasoning
kalshi_direct gives the price anchor, and kalshi_related on the same series covers the other date strikes and other resorts' opening markets, which together show the opening-date curve. The main open question is the historical base rate for Park City's opening date, which is usually around Nov 20-22. Wikipedia and a targeted search for past opening dates and the announced 2026 target date help pin that down. The resolution source is the resort's official site or snow report.
2. Research parallel tool calls + 4 web research loops (Sonnet 5) · read raw by the forecasters
at a glance
RESEARCH DIGEST (built in code: tool summaries and each report's bottom line; the forecasters read the full tool outputs and reports)
Tools
- kalshi_direct: ## This Market's Kalshi Data **Before Nov 22, 2026** (KXPARKCOPEN-27-22NOV26) - Current price (probability): 84.00% (live; bid 74% / ask 86%) - 7-day price change: +30.00% - 30-day price change: +4.00% - Average daily volume: 252 contracts - Price range: 54.00% - 84.00% - Data points: 13 days
- resolution_source: already_resolved=unclear; matches_criteria=True; last_updated=unknown. The fetched page is Park City Mountain's weather/snow report page, but the truncated content shown is mostly site navigation and menus; no actual opening date announcement or confirmation of Seasonal Opening Operations for the 26/27 season is present in the text.
- kalshi_related: 2 related markets / summaries. series KXPARKCOPEN: 0 markets (skipped 5 no-signal) | keyword 'ski resort open': ok | keyword 'Park City': ok
- article_search: Fetched 18 unique articles across 2 queries (lookback=400d). 'Park City Mountain opening day 2026-27 season date announced': 10 articles | 'Park City Mountain opening day history 2023 2024 2025': 10 articles
- wikipedia: Fetched 1 Wikipedia entries (0 missing pages).
Research loops, bottom lines
- current state: As of October 1, 2026, Park City Mountain's own official target is Nov. 20, 2026 (two days before the Nov. 22 deadline), but the resort's resolution-relevant history shows this exact target was missed last year (slipping to Dec. 5, 2025) and current El Niño-driven forecasts specifically warn of a slow, possibly rain-dominated start to November in northern Utah — making the Nov. 20 target plausible but far from assured to be met before Nov. 22.
- base rate: Over the last 7 seasons, Park City Mountain hit a Nov-22-or-earlier opening roughly 5 of 7 times (~71%), but the most recent season (2025-26) was a conspicuous miss, opening Dec 5 after a historically warm, dry November — showing that while the base rate favors "Yes," real year-to-year variance driven by early-winter weather is significant enough that a repeat delay is plausible.
- yes case: The strongest Yes case rests on Park City's firm Nov. 20 target (two days of buffer before the Nov. 22 deadline) being reinforced by fresh September 2026 signals — early high-elevation snow at Brian Head, Snowbird and Kings Peak, sector-wide snowmaking-capacity investments, fully staged snowmaking crews at sibling Vail resorts, and a strong-El-Niño analog that one climatologist says has historically "resulted in some high precipitation and snow in Park City" — all pointing to a more typical (les
- no case: The strongest NO case rests on mechanism, not just history: Park City's Nov. 20 target leaves almost no margin before the Nov. 22 cutoff, snowmaking is hard-constrained by a narrow temperature window that a "very strong" (81%-probability) El Niño specifically threatens with warm spells, and conflicting/unstable seasonal outlooks plus a very low current (Sept. 27) snowpack baseline mean there is no current evidence of favorable early-season conditions actually materializing.
tools
| tool | status | time | items | summary |
|---|---|---|---|---|
| kalshi_direct | OK | 0.1s | 1 | ## This Market's Kalshi Data **Before Nov 22, 2026** (KXPARKCOPEN-27-22NOV26) - Current price (probability): 84.00% (live; bid 74% / ask 86%) - 7-day price change: +30.00% - 30-day price change: +4.00% - Average daily volume: 252 contracts - Price range: 54.00% - 84.00% - Data points: 13 days |
| kalshi_related | OK | 2.8s | 2 | 2 related markets / summaries. series KXPARKCOPEN: 0 markets (skipped 5 no-signal) | keyword 'ski resort open': ok | keyword 'Park City': ok |
| resolution_source | OK | 9.6s | 1 | already_resolved=unclear; matches_criteria=True; last_updated=unknown. The fetched page is Park City Mountain's weather/snow report page, but the truncated content shown is mostly site navigation and menus; no actual opening date announcement or confirmation of Seasonal Opening Operations for the 26 |
| article_search | OK | 53.0s | 18 | Fetched 18 unique articles across 2 queries (lookback=400d). 'Park City Mountain opening day 2026-27 season date announced': 10 articles | 'Park City Mountain opening day history 2023 2024 2025': 10 articles |
| wikipedia | OK | 0.4s | 1 | Fetched 1 Wikipedia entries (0 missing pages). |
research loops
·
4/4 ok ·
17 searches ·
4 page reads
| dimension | status | time | searches | page reads | report |
|---|---|---|---|---|---|
| current state | OK | 26s | 4 | 1 | 4772 chars |
| base rate | OK | 33s | 4 | 1 | 4506 chars |
| yes case | OK | 40s | 5 | 1 | 6163 chars |
| no case | OK | 46s | 4 | 1 | 5313 chars |
report: current state
- [2026-08-18] Vail Resorts/Park City Mountain officially announced its target Opening Day for the 2026-27 season as **Friday, Nov. 20, 2026**, weather and conditions permitting; this is "the Friday before Thanksgiving" and is the resort's own stated target.
Park City Mountain announced Tuesday morning that its target opening date for the 2026/27 ski season is Friday, Nov. 20.
(https://www.parkrecord.com/2026/08/18/park-city-mountains-aims-for-nov-20-opening-day/)
- [2026-08-18] The same announcement explicitly flags conditionality:
"The target opening date is subject to change depending on weather and snow conditions."
(https://townlift.com/2026/08/park-city-mountain-announces-target-opening-date-for-upcoming-ski-season/)
- [2026-09-20] Salt Lake Tribune confirms Park City Mountain remains among Utah resorts hoping to open by Thanksgiving, alongside Alta and Solitude, under the current El Niño outlook. (https://www.sltrib.com/news/environment/2026/09/20/utah-ski-resort-2026-27-opening/)
- [2026-09-30] Ski Utah's live resort tracker still lists Park City Mountain's status as "Summer Open" with an anticipated winter opening date of November 20, 2026 — no snowmaking/opening updates posted yet as of late September. (https://www.skiutah.com/blog/authors/yeti/utah-ski-resort-opening-dates/)
- [2026-09-21] A National Weather Service hydrologist cautioned that the developing "Grande El Niño" pattern could bring
"relatively warm storms during October, November and potentially into December"
, with early-season precipitation falling as rain rather than snow at lower-to-mid elevations. (https://unofficialnetworks.com/2026/09/21/utah-el-nino-ski-season-forecast-2026-27/)
- [2026-08-13/2026-09-20] Multiple outlets (Deseret News, KSL, Ski Utah) report forecasters' consensus that
strong El Niño winters have delivered average to below-average snowpack to northern Utah, especially early in the season, with a pattern that tends to be slow in November and December but picks up from January through spring.
(https://www.deseret.com/lifestyle/2026/08/03/super-el-nino-utah-winter-snow-ski-resorts/)
- [2026-09-01] Park City Mountain unveiled a new "Larger Than Life" marketing campaign with Shaun White; per Kalshi's rules a rebrand does not change the resort's identity, so this has no bearing on resolution. (https://www.kpcw.org/ski-resorts/2026-09-01/park-city-mountain-announces-larger-than-life-brand)
- [2026-09-28] Vail Resorts confirmed major lift upgrades (Silverlode, Eagle/Eaglet replacements) are planned for the 2027-28 season, not this winter, so no near-term lift-construction delay is expected for 2026-27 opening. (https://www.parkrecord.com/2026/09/28/vail-resorts-says-new-park-city-mountain-lifts-will-be-ready-by-2027-28-season/)
- [2025-11-17 to 2025-12-05] Historical context: last season's target of Nov. 21, 2025 was delayed to Dec. 5, 2025 due to lack of early snow/warm temperatures — a direct precedent showing target dates for this resort are frequently missed.
"Park City Mountain delayed its opening from November 21 to December 5 after unseasonably warm temperatures and limited early snowfall left the mountain without enough coverage to open safely."
(https://townlift.com/2026/03/park-city-mountain-pulls-the-plug-on-mountain-village-this-weekend/)
- [2026-04/2026-09] Park City Mountain's heavy snowmaking investment ("state-of-the-art snowmaking system") was cited by the resort last year as key to opening even amid weak natural snow, and Vail Resorts has said it is "taking an aggressive approach to snowmaking" this year specifically to mitigate El Niño uncertainty. (https://www.abc4.com/news/digital-exclusives/park-city-opening-snow-super-el-nino/)
- [2026-09-01 to 2026-09-30] No decommissioning, ownership dispute, or operational shutdown of Park City Mountain has been reported; the resort continues normal summer-into-fall operations and capital planning under Vail Resorts. (https://www.sltrib.com/news/environment/2026/09/01/park-city-mountain-rebrands-with/)
NOT FOUND: No confirmation yet (as of 2026-10-01) of actual snowmaking start dates, early-season snow totals, or any updated/delayed opening announcement for the 2026-27 season — because the season has not yet begun and such updates typically emerge in late October/November.
BOTTOM LINE: As of October 1, 2026, Park City Mountain's own official target is Nov. 20, 2026 (two days before the Nov. 22 deadline), but the resort's resolution-relevant history shows this exact target was missed last year (slipping to Dec. 5, 2025) and current El Niño-driven forecasts specifically warn of a slow, possibly rain-dominated start to November in northern Utah — making the Nov. 20 target plausible but far from assured to be met before Nov. 22.
report: base rate
- [2019-11-22] Park City Mountain officially opened for the 2019-20 season, matching its planned date exactly.
Today, Park City Mountain officially opened for the 2019-20 season.
(on/before Nov 22 ✓)
- [2020-11-20] The resort opened two days before the Nov 22 threshold.
Park City Mountain Opens for the 2020-21 Winter Season PARK CITY, Utah – November 20, 2020 — Park City Mountain is now open for the 2020-21 winter season.
(✓)
- [2021-11-28/12-01] In the 2021-22 season the resort missed a Nov 22-type threshold: its planned Nov 19 open was delayed, and
the resort delayed its November 19 opening day last season due to a lack of snow. The Canyons Village side eventually opened on November 28 and Mountain Village on December 1.
(✗ — this is the key prior "miss" year)
- [2022-11-18] Park City opened on schedule well before Nov 22:
Park City Mountain announced Monday that the resort is scheduled to open for winter operations on Friday, November 18.
(✓)
- [2023-11-17] The resort opened early, two days ahead of its planned date amid a historically snowy season:
It has even set a date for when it expects its 2023-24 ski season to begin: Nov. 17... Last year the resort opened two days earlier than planned, getting a jump on what would become the snowiest season in resort history.
(✓)
- [2024-11-22] The 2024-25 season opened exactly on Nov 22, aided by favorable snow:
Thanks to nearly 30 inches of natural snow since late October, and perfect weather for snowmaking, Park City Mountain will offer guests an excellent Opening Day terrain package. On Opening Day guests will have access to ten trails and 3 Kings terrain park served by lifts and carpets across two base villages.
(✓, right at the boundary)
- [2025-12-05] Most recently, the 2025-26 season missed the Nov-22-type window badly: the resort's planned Nov 21 opening was postponed due to warm, dry weather, and lifts did not spin until
another season of boundless opportunities for winter adventure begins at Park City Mountain on Friday, December 5, as the nation's largest ski and snowboard resort opens for the 2025-26 winter season.
(✗ — most recent and most salient miss)
- [2025-11-17] The 2025-26 delay was driven by weather, explicitly:
Park City Mountain has postponed its scheduled Nov. 21 opening to an unspecified future date due to a lack of snow, but says guests can expect a fully operational lift system this season.
- [2025-11-18] The delay was part of a broader regional pattern that season:
The delay mirrors what happened at Brian Head, Alta Ski Area, and Solitude Mountain in Utah. Because of mild temperatures and low snowfall, they've all pushed their opening dates back.
- [2026-08-20 equivalent, i.e., 2025-08-20 announcement for 25/26 season] Vail Resorts/Park City consistently targets the Friday before Thanksgiving as its opening-day goal (historically around Nov 17-22), per VP of Mountain Operations:
"The Friday before Thanksgiving has always been our goal," shared Mike Lewis, Vice President of Mountain Operations. This carefully selected date aligns with when snowmaking and early natural snowfall typically deliver prime conditions.
- [base-rate summary] Across the last 7 seasons (2019-20 through 2025-26), Park City Mountain opened on or before Nov 22 in 5 of 7 years (~71%), and missed that threshold in 2 years (2021-22 and 2025-26), both times due to warm/dry early-winter weather delaying snowmaking, not resort closure or structural change.
- [trend note] Notably, the two "miss" years occurred in 2021 and again in 2025 — i.e., the most recent season was a miss, meaning the immediately preceding year's outcome does not strongly predict the next (no obvious multi-year streak), but it shows failures are weather-driven and recur roughly every few years rather than being rare one-offs.
NOT FOUND: No explicit third-party prediction market, meteorological outlook, or expert forecast specifically estimating probability of a sub-Nov-22 opening for the 2026-27 season was located; Vail Resorts has not yet (as of the search date) announced a target opening date for 2026-27.
BOTTOM LINE: Over the last 7 seasons, Park City Mountain hit a Nov-22-or-earlier opening roughly 5 of 7 times (~71%), but the most recent season (2025-26) was a conspicuous miss, opening Dec 5 after a historically warm, dry November — showing that while the base rate favors "Yes," real year-to-year variance driven by early-winter weather is significant enough that a repeat delay is plausible.
report: yes case
YES means: Park City Mountain conducts Seasonal Opening Operations (at least one public passenger lift serving open terrain) on or before Nov 21, 2026 ET, i.e., its own Nov 20 target date holds or is only trivially late.
- [2026-08-18] Park City Mountain's own announced target for 2026-27 is Nov. 20, 2026, explicitly framed around the historically favorable "Friday before Thanksgiving" slot that Vail's VP of Mountain Operations called the resort's enduring goal.
Park City Mountain's target date is Nov. 20, the Friday before Thanksgiving.
- [2026-08-18] Vail Resorts' official investor press release frames the 2026-27 calendar around optimism for a "Super El Niño," with leadership stating the company is "laser focused on preparing our resorts to deliver the best" experience and feels optimistic given "the possibility of blockbuster snowfall."
"It may only be August, but we're laser focused on preparing our resorts to deliver the best and most differentiated guest experience in skiing and riding," said Bill Rock, President of Vail Resorts' Mountain Division.
- [2026-09-01 to 2026-09-10] Independent trackers (Unofficial Networks) corroborate Park City is grouped with Solitude, Whistler Blackcomb, Heavenly and Northstar all targeting the same Nov. 20 date, with Brian Head even earlier (Nov. 6) — showing a broad regional push for earlier-than-last-year openings.
Utah's announced opening calendar currently begins with Brian Head on November 6. After that: Park City: November 20, Solitude: November 20
- [2026-09-14] KUER reporting on Brian Head's roughly $1 million snowmaking system upgrade (adding ~50% more snow guns) illustrates a sector-wide capital response to last year's failure, aimed at making early openings less weather-dependent this year.
This summer, Pettigrew said the resort spent nearly $1 million to beef up its snowmaking system. "It increases the amount of water that we deliver, which enables us to use approximately 50% more snow guns," Pettigrew said.
- [2026-09-14] That same Brian Head official expressed rising confidence based on observed conditions differing from the prior two years:
"We're seeing differences in the weather this year compared to last year and the prior year," Pettigrew said. "And that just gives me hope — more than hope, gives me confidence — that we will see a return to a winter like we normally experience at Brian Head."
- [2026-09-17] Sibling Vail resort Arapahoe Basin reported its snowmaking crew and systems are fully staged and ready, waiting only on temperature, indicating company-wide operational readiness heading into October rather than any equipment or staffing delay risk.
With temperatures beginning to fall across Colorado, Arapahoe Basin Ski Area is preparing to make its first snow of the 2026-27 ski season. The ski area recently shared an update showing that its snowmaking operation and crew are ready to begin work once temperatures become cold enough.
- [2026-09-29] Early-season natural snow has already fallen regionally — Arizona Snowbowl and Brian Head, Utah both recorded their first snow of the season in late September, a leading sign that cold air is arriving on a more typical schedule than last year's record-warm start.
Winter showed up a little early at Arizona Snowbowl and Brian Head, Utah, this week. Arizona Snowbowl plans to open for the season on November 20, 2026
- [2026-09-19] TownLift reports snow was also observed on some of Utah's highest peaks (e.g., Kings Peak) in mid-to-late September, and Snowbird shared photos of accumulating snow — both well ahead of the typical Nov. 15 median first-snow date for the region.
Both Brian Head in Southern Utah and Snowbird near Salt Lake City shared recent photos showing shallow dustings of snow. Hikers have also shared photos of snow on some of Utah's highest peaks.
- [2026-09-20] A University of Utah climatologist quoted by TownLift noted that historically strong El Niño years have specifically "resulted in some high precipitation and snow in Park City," distinct from the generic statewide caution about El Niño variability.
"And if you look at the analogs — what years were similar to this — really, there is no year that's similar to this in terms of El Niño," Jennings said. "But years that were pretty strong did result in some high precipitation and snow in Park City."
- [2026-09-10] Vail's own planning calendar places Keystone (Colorado) as aiming to open "as soon as possible in October," earlier than last year's Oct. 25 opener — if Keystone's snowmaking conditions allow an on/ahead-of-schedule opening, it signals the broader continental cold pattern Vail is counting on is arriving on time, which is the same pattern Park City depends on for its Nov. 20 date.
- [2026-09-28] Separately, colleagues' research already shows no lift/construction risk this year (upgrades deferred to 2027-28) and no decommissioning risk — removing two structural failure modes and leaving weather as the sole swing factor, which the above indicators suggest is trending favorably versus last year's record-warm analog.
BOTTOM LINE: The strongest Yes case rests on Park City's firm Nov. 20 target (two days of buffer before the Nov. 22 deadline) being reinforced by fresh September 2026 signals — early high-elevation snow at Brian Head, Snowbird and Kings Peak, sector-wide snowmaking-capacity investments, fully staged snowmaking crews at sibling Vail resorts, and a strong-El-Niño analog that one climatologist says has historically "resulted in some high precipitation and snow in Park City" — all pointing to a more typical (less record-warm) early season than 2025's failure, which should let the Nov. 20 target hold or slip only marginally and still clear Nov. 22.
NOT FOUND: No confirmation yet that Park City Mountain's snow guns have been turned on for 2026-27 (last year's first firing was Oct. 27, 2025, and this year's equivalent date had not occurred as of this search); no October 2026 temperature/wet-bulb data from Park City itself; no word yet on whether Keystone has opened in October 2026 to serve as the first real-world test of this season's cold-air arrival.
report: no case
YES means: Park City Mountain conducts qualifying Seasonal Opening Operations (public lift access to open terrain) on or before Nov 21, 2026 (Eastern Time calendar day cutoff before Nov 22).
- [2026-09-27] Statewide Utah snowpack sits at only 27% of normal across 49 SNOTEL stations this early fall, underscoring that the mountains are starting the water year from a low baseline rather than with any pre-season surplus that could buffer a warm November. (https://snoflo.org/snow/report/utah/)
- [2026-08-18] NOAA's Climate Prediction Center placed the odds of a "very strong" El Niño between October and December at 81%, a historically rare strength category associated in forecaster commentary with slow, rain-dominated starts to the Wasatch winter. (https://townlift.com/2026/08/strong-el-nino-could-tilt-utahs-winter-warmer-and-drier/)
- [2026-08-18] That same CPC outlook explicitly favors above-normal temperatures for Utah during the core winter months and places northern Utah/the Wasatch Back directly on the boundary between NOAA's wetter-south and drier-north El Niño precipitation split, meaning the mountains most relevant to Park City sit in the less favorable half of the state's precipitation outlook. (https://townlift.com/2026/08/strong-el-nino-could-tilt-utahs-winter-warmer-and-drier/)
- [2026-08-21] A separate, later CPC fall update (Sept-Oct-Nov) instead leaned toward above-normal precipitation and temperatures statewide, showing that even official seasonal outlooks have shifted and disagree month to month — this forecast instability is itself evidence against assuming a confident on-time open. (https://www.ksl.com/article/51614320/everyones-talking-about-a-super-el-nio-winter-but-how-will-it-affect-utahs-fall)
- [2026-08-18] Vail Resorts' own 2026-27 target-date release groups Park City Mountain with Whistler Blackcomb, Heavenly and Northstar at Nov. 20 — a batch of resorts in different climates that the company is treating as a single "mid-tier" risk bucket, two days before Breckenridge/Vail Mountain's earlier Colorado targets, implying corporate awareness that Park City is not among its most snow-secure properties. (https://news.vailresorts.com/2026-08-18-Is-Winter-About-to-Show-Off-Vail-Resorts-Announces-2026-27-Opening-Dates-as-Super-El-Nino-Builds-Anticipation-for-Great-Powder)
- [2026-09-19] Even Keystone, Vail Resorts' earliest-opening and most aggressively groomed property, had only recorded its first light snowfall of the season and had not yet opened as that report was published, consistent with the historical pattern of early-season openings depending on last-minute conditions rather than being locked in weeks ahead. (https://www.powder.com/news/keystone-resort-first-snow-season)
- [2026-08-18] Vail Resorts' president explicitly hedged the entire 2026-27 opening calendar, stating the company cannot predict what "Mother Nature will deliver" and is relying on aggressive snowmaking rather than guaranteed natural snow to hit targets. (https://news.vailresorts.com/2026-08-18-Is-Winter-About-to-Show-Off-Vail-Resorts-Announces-2026-27-Opening-Dates-as-Super-El-Nino-Builds-Anticipation-for-Great-Powder)
- [2026-09 (snowmaking mechanism)] A Denver7 interview with Keystone's operations team quantified the snowmaking constraint: the resort needs temperatures in roughly a 14°F-to-27°F window to make snow, meaning any multi-day warm spell in the two-week window before Nov. 20-22 can mechanically stall snowmaking across the whole Vail Resorts portfolio, not just Park City. (https://www.denver7.com/news/local-news/vail-resorts-announces-target-opening-dates-for-2026-2027-season)
- [structural/margin point] Because Park City's own target (Nov. 20) leaves only a two-day buffer before the Nov. 22 market deadline, the resolution is unusually sensitive to even a short slip; the two prior "miss" seasons (2021-22 and 2025-26, both already documented) involved delays of 7-14+ days, far more than the thin margin available this year, so a repeat of either prior failure mode would cause a clean NO.
- [reservoir/drought context] Utah's reservoirs had fallen to just 52% capacity by late August 2026 after last winter's record-low snowpack, meaning there is added institutional and public pressure narrative around "will this winter deliver," but no physical buffer of residual high-elevation snow carried into this fall that could accelerate an early opening. (https://www.ksl.com/article/51614320/everyones-talking-about-a-super-el-nio-winter-but-how-will-it-affect-utahs-fall)
NOT FOUND: No October 2026 snowmaking-start confirmation, no updated (post-Sept 27) SNOTEL readings for Park City-area stations specifically (Thaynes Canyon, Trial Lake), and no resort-issued statement narrowing or reaffirming the Nov. 20 target since the Aug. 18 announcement.
BOTTOM LINE: The strongest NO case rests on mechanism, not just history: Park City's Nov. 20 target leaves almost no margin before the Nov. 22 cutoff, snowmaking is hard-constrained by a narrow temperature window that a "very strong" (81%-probability) El Niño specifically threatens with warm spells, and conflicting/unstable seasonal outlooks plus a very low current (Sept. 27) snowpack baseline mean there is no current evidence of favorable early-season conditions actually materializing.
3. Forecasters 5 draws · Opus 5.5 + GPT-5.6 Sol · plain mean
claude-opus-5-5
50% conf
| Yes | 71% |
| No | 29% |
(0) Not resolved: Ski Utah still lists Park City as 'Summer Open' with an anticipated Nov 20 opening as of Sept 30; a public lift must run by Nov 21 ET. (a) About seven weeks remain, and snowmaking typically starts in late October. (b) Status quo is the resort's Aug 18 target of Friday Nov 20, a one-day buffer before the deadline. Park City hit its target in about 5 of the last 7 seasons, missing in 2021 and 2025 by 7-14 days, so a repeat of that failure mode is a clean No. (c) No: a very strong El Niño (81% CPC odds) brings warm, rain-dominated storms in Oct-Nov per an NWS hydrologist, snowmaking stalls outside the 14-27F window, and opening slips to December as in 2025. (d) Yes: cold air arrives normally (late-September dustings at Snowbird and Brian Head), Vail's aggressive snowmaking builds a base, and the resort opens Nov 20 as in 2023's El Niño year (Nov 17). The market's 84% (74/86 spread) looks somewhat rich against the base rate, the El Niño headwinds and the thin margin, with no hard October data either way.
claude-opus-5-5
50% conf
| Yes | 73% |
| No | 27% |
(0) Resolution check: nothing has resolved. The resolution-source page shows no 26/27 opening, and Ski Utah (Sept 30) still lists Park City as "Summer Open" with an anticipated Nov 20 opening. (a) There are about 7 weeks until the deadline, so Park City must spin a public lift on Nov 20 or 21 at the latest. (b) Status quo: the resort's official target is Fri Nov 20, so on-target execution gives YES with only a two-day buffer. (c) NO scenario: the strong El Niño brings warm, rain-prone storms in early-to-mid November, as the NWS hydrologist warned. That stalls snowmaking, which needs roughly 14–27°F temperatures, and opening slips by a week or more, as in 2021 (Nov 28) and 2025 (Dec 5). (d) YES scenario: cold nights arrive on a normal schedule, consistent with the early high-elevation September snow seen at Snowbird, Brian Head and Kings Peak. Vail's aggressive snowmaking then delivers a small terrain package by Nov 20, as in 2019, 2020, 2022, 2023 and 2024. Historically Park City hit its target or was early in 5 of the last 7 seasons, and missed only in 2021 and 2025, both by 7+ days. Strong El Niño analogs (2015, 2023) did not prevent near-target openings. The Kalshi anchor is 84%, with a wide 74/86 spread and a +30-point jump on thin volume. I find no new hard information, such as snowmaking having started, that justifies pricing above the roughly 70% base rate. I shade below the market to about 73%, giving slight credit for snowmaking investment and early cold signs against El Niño warm-November risk.
claude-opus-5-5
50% conf
| Yes | 74% |
| No | 26% |
(0) Not resolved. As of Oct 1 Ski Utah lists Park City as 'Summer Open', and the resort's own snow-report page shows no winter opening. Park City Mountain still has to spin a public lift for skiing by Nov 21 (Eastern Time) for Yes. (a) That leaves about seven weeks, with only a two-day buffer after the resort's official Nov 20 target, announced Aug 18. (b) Status quo: the Nov 20 target holds and the resort opens on time, which would resolve Yes. Historically, on-time years (2019, 2020, 2022, 2023, 2024) cleared the bar, about 5 of the last 7 seasons. (c) No scenario: a strong El Niño brings warm, rain-dominated storms in late October and November, as an NWS hydrologist cautioned. That stalls snowmaking in its 14-27°F window and the target slips a week or more, as in 2021 (Nov 28) and 2025 (Dec 5). Prior misses ran 7 to 14+ days, so the thin margin offers little protection. (d) Yes scenario: the early September snow at Snowbird, Brian Head and Kings Peak signals a more normal cold arrival than 2025's record warmth. Vail's aggressive snowmaking plan and no lift construction this year then let Park City hit Nov 20, as in 2023's El Niño year when it opened early. The Kalshi anchor is 84% (bid 74/ask 86, mid about 80) after a +30% jump this week. I found no specific new information justifying that jump. With the base rate near 71% and real El Niño and low-snowpack headwinds, I shade below the market to about 74%.
gpt-5.6-sol
64% conf
| Yes | 62% |
| No | 38% |
(0) The resort’s weather page does not confirm qualifying 2026-27 operations, so the event is unresolved; at least one passenger lift must carry eligible members of the public to open ski or snowboard terrain by November 21 Eastern Time. (a) About 52 days remain from October 1 until the before-November-22 deadline, with Park City’s weather-dependent target of November 20 leaving only a narrow margin. (b) If nothing changes and the resort remains in its currently reported “Summer Open” status, the outcome is No. (c) No results if the forecast warm El Niño pattern prevents adequate snowmaking and forces even a short delay beyond November 21, as occurred more substantially in 2021 and 2025. (d) Yes results if aggressive snowmaking and sufficiently cold November conditions allow the resort to meet its official November 20 target, supported somewhat by early high-elevation regional snowfall and the absence of structural or lift-construction problems. I am below Kalshi’s 84% Yes anchor because the cited 5-of-7 base rate incorrectly treats openings on November 22 in 2019 and 2024 as qualifying even though the contract says before November 22; only three of the seven listed historical opening dates were strictly earlier. The official target still makes Yes more likely than No, but the corrected history, last season’s December 5 opening, warm-season outlook, and lack of Park City-specific snowmaking evidence make 84% too optimistic.
gpt-5.6-sol
68% conf
| Yes | 68% |
| No | 32% |
(0) The resolving condition has not already been met: Ski Utah still listed Park City Mountain as “Summer Open” on September 30, while the resort’s resolution-source page provides no confirmation of 2026-27 Seasonal Opening Operations; a qualifying public lift opening must occur by November 21 Eastern Time. (a) About 52 days remain until the November 22 cutoff, with the resort targeting November 20 and therefore retaining only a one-day calendar cushion. (b) If nothing changes, the resort remains closed for winter operations and the market resolves No, although its announced target currently points toward Yes. (c) No results if above-normal temperatures or rain prevent adequate snowmaking and force even a two-day delay, as occurred more substantially in 2021 and 2025. (d) Yes results if aggressive snowmaking and ordinary November cold allow at least one public lift and designated trail to open on the planned November 20 date. I discount Kalshi’s 84% Yes anchor because the cited 5-of-7 historical base rate incorrectly treats openings exactly on November 22 in 2019 and 2024 as successes even though “before Nov 22” excludes them, while the strong El Niño outlook adds warm-start risk. The official November 20 target, early regional high-elevation snow, operational readiness, and absence of structural impediments still leave Yes favored, but not at the market’s current level.
4. Final plain mean of 5 draws
70%
(56% confidence)
Yes: 70%
No: 30%
Mean of 5 draws (0.71, 0.73, 0.74, 0.62, 0.68). (0) Not resolved: Ski Utah still lists Park City as 'Summer Open' with an anticipated Nov 20 opening as of Sept 30; a public lift must run by Nov 21 ET. (a) About seven weeks remain, and snowmaking typically starts in late October. (b) Status quo is the resort's Aug 18 target of Friday Nov 20, a one-day buffer before the deadline. Park City hit its target in about 5 of the last 7 seasons, missing in 2021 and 2025 by 7-14 days, so a repeat of that failure mode is a clean No. (c) No: a very strong El Niño (81% CPC odds) brings warm, rain-dominated storms in Oct-Nov per an NWS hydrologist, snowmaking stalls outside the 14-27F window, and opening slips to December as in 2025. (d) Yes: cold air arrives normally (late-September dustings at Snowbird and Brian Head), Vail's aggressive snowmaking builds a base, and the resort opens Nov 20 as in 2023's El Niño year (Nov 17). The market's 84% (74/86 spread) looks somewhat rich against the base rate, the El Niño headwinds and the thin margin, with no hard October data either way.
Pipeline Timing
Total pipeline time: 101.0s
Per-tool research timings shown in the Research section above.