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Will Bald Mountain open before Nov 22, 2026?
4%
Agent
7%
Market Price
-2.6%
Edge
80%
Confidence
5,080
Volume
90.0c
Spread
60
Days to resolution
5
Markets in event
final rationale
Mean of 5 draws (0.04, 0.04, 0.04, 0.05, 0.05). (0) Nothing is resolved yet. The resolution source shows Bald Mountain at 0/0 lifts open as of Sept 29, and no source shows opening operations. (a) About 7.5 weeks remain until the Nov 22 cutoff; public skiing would have to start by Nov 21. (b) Status quo is No. Sun Valley's official Opening Day page and its season preview both set opening for Nov 26, 2026 (Thanksgiving), four days after the cutoff, and the resort says it opens on Thanksgiving 'like every year.' (c) NO: the resort holds to its Nov 26 plan or slips later, as it did last year to Dec 3. This is more likely given lift construction still underway and OpenSnow's drier early-season signal for southern Idaho. (d) YES: an unusual early cold snap plus the upgraded pumphouse snowmaking lets Sun Valley open a lift early, as in 1991 (Nov 16). That has no analog in the modern era, and the resort's marketing is anchored to Thanksgiving. The Kalshi price is 7% but thinly traded (2/92 spread), and the research gives specific reasons (a fixed Thanksgiving tradition and a Nov 26 official date) to shade below it, to about 4%.
price vs. prediction
market price
agent forecast at t+0
19 follow-ups
1. Planner Opus 5.5 · picks the research tools
Tools chosen:
kalshi_direct
resolution_source
kalshi_related
article_search
polymarket_related
Planner reasoning
Kalshi market, so kalshi_direct gives the price anchor. The resolution source is Sun Valley's own operations page. kalshi_related shows the sibling date thresholds and other resorts' opening markets, which together give the implied distribution. Historical Bald Mountain opening dates are the base rate: Sun Valley usually targets Thanksgiving week and occasionally opens earlier with snowmaking, so one targeted article_search goes after the announced 2026 opening date and past opening dates.
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** (KXBALDYOPEN-27-22NOV26) - Current price (probability): 7.00% (live; bid 2% / ask 92%) - 7-day price change: +1.00% - 30-day price change: +1.00% - Average daily volume: 2540 contracts - Price range: 6.00% - 7.00% - Data points: 2 days
- resolution_source: already_resolved=unclear; matches_criteria=True; last_updated=September 29, 2026 (mountain report), with a page snapshot noting 'Last Updated: Apr 12, 2:36 PM MT'. Bald Mountain shows 0/0 lifts open and 0/0 trails open, with a 41" base and data dated September 29, 2026, indicating the mountain is not yet operating for the season.
- kalshi_related: 2 related markets / summaries. series KXBALDYOPEN: 0 markets (skipped 5 no-signal) | keyword 'ski resort open': ok | keyword 'opening day': ok
- article_search: Fetched 15 unique articles across 2 queries (lookback=365d). 'Sun Valley Bald Mountain 2026-27 opening day date': 10 articles | 'Bald Mountain Sun Valley opening day history Thanksgiving early opening': 10 articles
- polymarket_related: Polymarket search over 2 keyword(s), kept 0 matches. keyword 'Sun Valley': 0 markets | keyword 'ski resort opening': 0 markets
Research loops, bottom lines
- current state: As of late September 2026, Sun Valley/Bald Mountain's officially announced and third-party-confirmed target opening date is November 26, 2026 (Thanksgiving), which is before the Nov 22 cutoff only if... actually Nov 26 is AFTER Nov 22 — so the announced plan itself already falls after the market's Nov 22 deadline, and last season's opening was further delayed by weather to Dec 3 rather than moved earlier, indicating a low likelihood of Bald Mountain opening before Nov 22, 2026.
- base rate: In the reference class of the last several Sun Valley seasons, opening day has consistently landed on or after Thanksgiving Day itself (Nov 23–28 range), and when weather has interfered the resort has only ever opened later than planned, never earlier; with Thanksgiving 2026 falling on Nov 26 and the resort's own schedule targeting that date, an opening before Nov 22, 2026 would require an unprecedented multi-day-early opening relative to every recent and the officially announced schedule.
- yes case: The only plausible path to YES is an unprecedented (not seen in over 30 years under modern operations) early cold snap combined with the resort's continuing snowmaking investments enabling a jump on its own Nov 26 target; current seasonal outlooks and the resort's own public schedule and construction status give no indication this is underway, making the YES case rest entirely on an uncommitted, currently-unsupported weather contingency.
- no case: Sun Valley's own official schedule, reiterated by every source found, targets Nov 26, 2026 — already 4 days after the market's Nov 22 cutoff — and the resort's active, still-unfinished top-mountain lift replacement projects (Lookout Express, Christmas) plus last season's weather-driven slip to Dec 3 show every recent precedent points to on-time-or-later openings, never earlier; an opening before Nov 22 would require the resort to beat its own announced plan by at least five days, something with
tools
| tool | status | time | items | summary |
|---|---|---|---|---|
| kalshi_direct | OK | 0.2s | 1 | ## This Market's Kalshi Data **Before Nov 22, 2026** (KXBALDYOPEN-27-22NOV26) - Current price (probability): 7.00% (live; bid 2% / ask 92%) - 7-day price change: +1.00% - 30-day price change: +1.00% - Average daily volume: 2540 contracts - Price range: 6.00% - 7.00% - Data points: 2 days |
| resolution_source | OK | 5.1s | 1 | already_resolved=unclear; matches_criteria=True; last_updated=September 29, 2026 (mountain report), with a page snapshot noting 'Last Updated: Apr 12, 2:36 PM MT'. Bald Mountain shows 0/0 lifts open and 0/0 trails open, with a 41" base and data dated September 29, 2026, indicating the mountain is no |
| kalshi_related | OK | 4.8s | 2 | 2 related markets / summaries. series KXBALDYOPEN: 0 markets (skipped 5 no-signal) | keyword 'ski resort open': ok | keyword 'opening day': ok |
| article_search | OK | 4.8s | 15 | Fetched 15 unique articles across 2 queries (lookback=365d). 'Sun Valley Bald Mountain 2026-27 opening day date': 10 articles | 'Bald Mountain Sun Valley opening day history Thanksgiving early opening': 10 articles |
| polymarket_related | OK | 0.8s | 0 | Polymarket search over 2 keyword(s), kept 0 matches. keyword 'Sun Valley': 0 markets | keyword 'ski resort opening': 0 markets |
research loops
·
4/4 ok ·
15 searches ·
6 page reads
| dimension | status | time | searches | page reads | report |
|---|---|---|---|---|---|
| current state | OK | 33s | 3 | 3 | 4321 chars |
| base rate | OK | 38s | 4 | 1 | 4041 chars |
| yes case | OK | 34s | 4 | 2 | 3935 chars |
| no case | SNIPPETS | 36s | 4 | 0 | 5545 chars · no page read; snippets only |
report: current state
- [2026-09-17] Sun Valley Resort's official 91st-season preview states the resort is
scheduled to open on November 26, 2026 — Thanksgiving Weekend
, published on SnowBrains. (https://snowbrains.com/sun-valley-91st-season-opening-november-26-2026/)
- [2026-09-28] The resort's own official "Opening Day" page confirms: "2026–2027 Opening Day is November 26!" with festivities including hot cocoa and terrain opening at 9am. (https://www.sunvalley.com/the-mountain/opening-day/)
- [2026-09-28] Sun Valley's live mountain report page (as of this date) shows Bald Mountain currently has 0/0 lifts and trails open (summer/off-season status), with no snowmaking or opening operations underway yet. (https://www.sunvalley.com/the-mountain/mountain-report/)
- [2026-09-28] The mountain report notes ongoing lift construction impacts:
"Warm Springs Trail: Closed due to snowmaking upgrades and World Cup finish area work," and "Bald Mountain Trail (BMT): No estimated opening at this time."
These relate to hiking/biking trail access, not the ski-lift opening itself. (https://www.sunvalley.com/the-mountain/mountain-report/)
- [2026-09-28] Sun Valley's season pass page states Early/Late season passes are
"Unlimited access to Sun Valley's Bald and Dollar Mountain from Opening Day–12/11/26 and 3/24/27–Closing Day"
, implying an "Opening Day" designation for pass validity consistent with the Nov. 26 target. (https://www.sunvalley.com/tickets-passes/season-passes/)
- [2026-09-17] SnowBrains reports two new Doppelmayr high-speed lifts (Lookout Express upgraded to six-person, Christmas Lift to a high-speed quad) plus
"upgrades across all four pumphouses serving Bald Mountain"
for snowmaking reliability this season. (https://snowbrains.com/sun-valley-91st-season-opening-november-26-2026/)
- [2026-09-17] The same article notes Sun Valley's traditional annual "Pray for Snow Party" is scheduled for Saturday, November 7, 2026, as a pre-season community event ahead of opening. (https://snowbrains.com/sun-valley-91st-season-opening-november-26-2026/)
- [2025-11-30] Historical precedent: for the 2025-26 season, Sun Valley had originally planned a Thanksgiving (Nov. 27, 2025) opening but delayed it to
"Wednesday, Dec. 3, for the 2025-26 season after weather forced it to delay the opening"
due to warm, dry conditions hampering snowmaking. (https://www.mtexpress.com/news/recreation/resort-announces-new-opening-date/article_81365ba4-6bcb-4d4d-8ada-f63b2dbc1c55.html)
- [2025-10-14] For context, the prior 2025-26 season's originally announced date was
"its 90th winter season which commences on Thanksgiving Day, Thursday, November 27, 2025"
, showing the resort's pattern of targeting the Thanksgiving weekend but sometimes slipping about a week due to weather. (https://www.sunvalley.com/blog/news/90th-season/)
- [2026-08-10] A long-range snow forecast tracker (J2Ski) as of mid-August 2026 shows no early/unusual snowfall signals yet for Sun Valley heading into fall; seasonal forecasts (Almanac.com) for the broader region suggest a warmer-than-normal early winter with coldest periods concentrated in late November/early December, a factor that historically has affected opening timing. (https://us.j2ski.com/snow_forecast/United_States/Sun_Valley_weather.html; https://www.almanac.com/weather/longrange/nv/Sun%20Valley)
- [2026-09-29] Third-party trackers (OnTheSnow, Skiresort.info) list a
"Projected opening date Nov 26, 2026"
for Sun Valley, matching the resort's own announced date. (https://www.onthesnow.com/idaho/sun-valley/ski-resort)
BOTTOM LINE: As of late September 2026, Sun Valley/Bald Mountain's officially announced and third-party-confirmed target opening date is November 26, 2026 (Thanksgiving), which is before the Nov 22 cutoff only if... actually Nov 26 is AFTER Nov 22 — so the announced plan itself already falls after the market's Nov 22 deadline, and last season's opening was further delayed by weather to Dec 3 rather than moved earlier, indicating a low likelihood of Bald Mountain opening before Nov 22, 2026.
NOT FOUND: No official confirmation of an early/pre-Thanksgiving opening for 2026-27; no news yet (as of Sept 29, 2026) of any snowmaking start dates or early-access/preview openings that would count toward the Kalshi definition of "Seasonal Opening Operations."
report: base rate
- [2026-09-17] Sun Valley's official 2026-27 season preview states the resort is
scheduled to open on November 26, 2026 — Thanksgiving Weekend
, and that
Sun Valley will celebrate season opening on Thanksgiving, like every year
. Nov 26, 2026 is four days after the Nov 22 market cutoff. https://snowbrains.com/sun-valley-91st-season-opening-november-26-2026/
- [2025-12-02] For 2025-26 (90th season), Sun Valley originally targeted Nov 27 (Thanksgiving) but
pushed back its original opening day from November 27, 2025, because of persistently warm temperatures... that prevented the mountain from making enough snow to open safely... credited the rescheduled opening this week to the "return of colder temperatures"
, eventually opening Dec 3, 2025 — 11 days after the analogous Nov-22-style cutoff. https://www.powder.com/ski-resorts/sun-valley-opening-day-2025
- [2025-11-24] BoiseDev reported the 2025 delay marked the
conditions on Bald Mountain at its base as of November 20... Sun Valley has recorded just 11″ of snowfall so far this season
, and its headline notes this was the first missed Thanksgiving opening in over 15 years. https://boisedev.com/news/2025/11/20/a-bit-grim-sun-valley-to-miss-thanksgiving-opening-for-first-time/
- [2024-11-28] For 2024-25 (89th season), opening day was Thursday, Nov. 28, 2024, per Idaho Mountain Express:
Hailey residents... ride the first chair up Bald Mountain from the River Run base on Thursday, Nov. 28, 2024, Sun Valley Resort's opening day for the 2024-25 ski season
. That is after Nov 22. https://www.mtexpress.com/news/recreation/resort-announces-new-opening-date/article_81365ba4-6bcb-4d4d-8ada-f63b2dbc1c55.html
- [2022-11-24] For 2022-23 (87th season), opening day event was listed for
Thu Nov 24 2022, 09:00 AM - 04:00 PM
. Also after Nov 22. https://www.sunvalley.com/events/detail/bald-mountain-opening-day-2022
- [2023-10-27] For 2023-24 season, Valley Chamber calendar stated
The 2023 ski season opens November 23 at Sun Valley's Bald Mountain
— one day after the Nov-22 threshold. https://valleychamber.org/events/opening-day-of-bald-mountain/
- [1991-11-07] Historical record shows Sun Valley's earliest-ever opening was Nov. 16, 1991, when
Sun Valley predicts it will open Nov. 16, the earliest in its 56 years of winter operation... The resort usually opens on Thanksgiving
, driven by an unusually early cold snap plus a new $8.1M snowmaking system. https://www.lmtribune.com/northwest/sun-valley-predicts-its-earliest-opening-ever-fa744205
- [Pattern] Across the last five documented seasons (2022-2026), Bald Mountain's opening day has clustered on or near Thanksgiving Day (Nov 23–28), tracking the shifting Thanksgiving calendar date rather than a fixed calendar day; in 2026 Thanksgiving falls unusually late (Nov 26), pushing the scheduled target itself past the Nov 22 cutoff.
- [Snowmaking] The
resort is also continuing to invest in snowmaking reliability, with upgrades across all four pumphouses serving Bald Mountain
for 2026-27, which could help hold to the Nov 26 target but does not indicate any plan to open earlier than scheduled.
BOTTOM LINE: In the reference class of the last several Sun Valley seasons, opening day has consistently landed on or after Thanksgiving Day itself (Nov 23–28 range), and when weather has interfered the resort has only ever opened later than planned, never earlier; with Thanksgiving 2026 falling on Nov 26 and the resort's own schedule targeting that date, an opening before Nov 22, 2026 would require an unprecedented multi-day-early opening relative to every recent and the officially announced schedule.
NOT FOUND: No case in the last ~10 seasons of Bald Mountain opening for public downhill skiing before Nov 22 under normal operations (the sole precedent for an opening that early, Nov 16, 1991, is 35 years old and pre-dates current snowmaking/operational practices); no Kalshi-specific historical resolution data for sibling contracts (e.g., prior-year "before Nov X" Bald Mountain markets) was found.
report: yes case
YES means: Bald Mountain (Sun Valley) begins Seasonal Opening Operations (at least one public passenger lift serving open downhill terrain) on some calendar day before November 22, 2026.
- [2026-09-17] Sun Valley's own release confirms continued heavy investment in operational reliability for 2026-27, including "upgrades across all four pumphouses on Bald Mountain built to support the system's reliability and long-term success," which — as the strongest mechanism for an early opening — improves the resort's ability to make snow quickly if a cold snap arrives in October/November. (https://www.outdoorsportswire.com/sun-valley-resort-unveils-new-chairlifts-expanded-terrain-and-a-first-u-s-darksky-resort-designation-for-2026-27/)
- [2026-08-11] OpenSnow's seasonal outlook states Southern Idaho (Sun Valley/Bogus Basin) sits in a largely "equal chances" zone for snowfall this El Niño winter but explicitly notes
"Bogus Basin and Sun Valley can do better in strong El Nino winters as storms can swing up from California via favorable southerly winds, but this doesn't always happen as Sun Valley has had below-average El Nino winters in addition to above-average ones."
This leaves a non-zero chance of an early-arriving southerly storm track bringing cold and snow well ahead of Thanksgiving.
- [2026-08-11] The same outlook adds that for Southern Idaho
"there is a drier signal early in the season from November-December and again in February, with a s[tronger signal in January and March]"
— meaning the base-rate meteorological signal actually leans against, not for, an early-November cold/snow surge, tempering the YES case's own best mechanism.
- [1991-11-07] The sole historical precedent for a pre-Thanksgiving Bald Mountain opening shows the mechanism required: general manager Wallace Huffman said
"Our automated snowmaking system and early snowfall are allowing us to start early,"
with 17 inches of snow on the ground in early November and an early cold snap — i.e., an early opening has historically required both an early cold snap AND functioning snowmaking capacity simultaneously.
- [2026-09-17] Sun Valley has explicitly stated
"Sun Valley will celebrate season opening on Thanksgiving, like every year"
, and the two new Doppelmayr lifts (Lookout Express, Christmas) are
"scheduled to open in December 2026"
— the resort's own operational calendar contains no plan or preparation aimed at a pre-Nov-22 opening.
- [2026-09-28] The live mountain report (as of Sept 28) shows zero lifts/terrain open and no snowmaking activity yet, and separately flags that "Bald Mountain Trail (BMT): No estimated opening at this time" due to World Cup finish-area construction work — an added operational complication this year (relative to prior seasons) that argues against, not for, moving the opening earlier than the announced Nov 26 date.
- [Mechanism note] For YES to occur, Sun Valley would need to both reverse its own public Thanksgiving-target messaging and replicate the rare 1991 combination of an unusually early autumn cold snap plus rapid snowmaking buildup — a scenario for which there is no current forecasting or operational signal as of late September 2026.
BOTTOM LINE: The only plausible path to YES is an unprecedented (not seen in over 30 years under modern operations) early cold snap combined with the resort's continuing snowmaking investments enabling a jump on its own Nov 26 target; current seasonal outlooks and the resort's own public schedule and construction status give no indication this is underway, making the YES case rest entirely on an uncommitted, currently-unsupported weather contingency.
NOT FOUND: No evidence of any snowmaking start date, cold-weather advisory, or resort statement in September 2026 suggesting Sun Valley is targeting or preparing for an opening before November 22, 2026; no confirmed early/preview-access day announced for Bald Mountain this season.
report: no case
YES means: Bald Mountain (Sun Valley) conducts Seasonal Opening Operations (at least one passenger lift open to the general public for downhill skiing/riding on designated terrain) on any calendar day before Nov 22, 2026 (Eastern Time), i.e., on or before Nov 21, 2026.
- [2026-09-17] Sun Valley's own 91st-season preview confirms the resort is
"scheduled to open on November 26, 2026 — Thanksgiving Weekend"
and that
"Sun Valley will celebrate season opening on Thanksgiving, like every year"
— a plan that is already four days later than the Nov 22 cutoff, meaning even a fully on-schedule season resolves this market No. (https://snowbrains.com/sun-valley-91st-season-opening-november-26-2026/)
- [2026-09-29] Third-party trackers independently list the same target:
"Projected opening date Nov 26, 2026"
for Sun Valley. (https://www.onthesnow.com/idaho/sun-valley/ski-resort)
- [2026-08-12] Beyond snow/weather risk, Bald Mountain enters this season mid-construction: the Idaho Mountain Express reports the resort is
"working to have the new lifts fully operational for the 2026-27 winter season"
and that,
"because the resort is replacing the Christmas chairlift, lift access to the top of Baldy has not been available to hikers, bikers or sightseers this summer"
— a mechanism (unfinished top-mountain lift replacements) that raises operational risk of delay rather than acceleration relative to the already-late Nov 26 target.
- [2026-08-31] As of late August, SnowBrains reported crews were still completing structural work:
"In an early July update, grooming and trails Manager John Nichols discussed completing the lift tower concrete bases on the new Lookout Express. The work required a helicopter lifting 4,000 pounds of concrete for each tower"
— indicating the two new Doppelmayr lifts (Lookout Express, Christmas) were only being finished in the final weeks before ski season, adding schedule risk on top of snowmaking uncertainty.
- [2026-09-28] Sun Valley's live mountain report (as fetched) still shows
"Warm Springs Trail: Closed due to snowmaking upgrades and World Cup finish area work"
and
"Bald Mountain Trail (BMT): No estimated opening at this time"
, and separately flags
"Christmas & Lookout Lift Enhancements: Coming Winter 2026–2027"
as still-pending work rather than completed infrastructure, consistent with a resort still finishing capital projects rather than preparing for an early opening.
- [2025-12-02] The most recent precedent shows the resort's only response to adverse conditions is to open later than planned, never earlier: last season's Thanksgiving target slipped to
"Wednesday, December 3, 2025"
, a delay of about a week caused by
"persistently warm temperatures... that prevented the mountain from making enough snow to open safely"
.
- [2025-11-20] The mechanism behind that delay was documented in detail by the Idaho Mountain Express meteorological sourcing: a persistent high-pressure ridge and a "split-flow" jet stream pattern
diverted storms and pushed most systems toward Montana and California instead of central Idaho
— a recurring type of regional pattern that, if it recurs in 2026, would only push an already-Nov-26-targeted opening further past the Nov 22 cutoff, not pull it earlier.
- [2026-09-15] Regional industry attention this fall is on climate adaptation, not accelerated openings: Sun Valley is hosting the
"2026 Mountain Towns 2030 Climate Summit... scheduled for Oct. 13-14 in Sun Valley, Idaho"
, explicitly framed around wildfire and climate resilience — a sign the resort and peers are operating from an assumption of warming trends and operational risk, not early-season abundance.
- [Reference class] Sun Valley's season-pass structure itself embeds the Nov 26 assumption: the pass terms define
"Unlimited access to Sun Valley's Bald and Dollar Mountain from Opening Day–12/11/26"
, treating "Opening Day" as a single flexible marketing date rather than any earlier preview or soft-opening window that could count under the market's "Seasonal Opening Operations" test.
- [2026-09-17] For comparison, most other major Western resorts targeting to be open in the Nov 22 window are unrelated ski areas (e.g.,
"Mammoth Mountain currently positioned to get things started in mid-November... the calendar then gets busy around Thanksgiving, when Heavenly, Northstar California, Palisades Tahoe and Sugar Bowl all hope to be spinning lifts within the span of a week"
), underscoring that Sun Valley's Thanksgiving-anchored (Nov 26) calendar is a structural, resort-specific choice, not a byproduct of unusually late snow region-wide.
BOTTOM LINE: Sun Valley's own official schedule, reiterated by every source found, targets Nov 26, 2026 — already 4 days after the market's Nov 22 cutoff — and the resort's active, still-unfinished top-mountain lift replacement projects (Lookout Express, Christmas) plus last season's weather-driven slip to Dec 3 show every recent precedent points to on-time-or-later openings, never earlier; an opening before Nov 22 would require the resort to beat its own announced plan by at least five days, something with no analog in the last 10+ seasons.
NOT FOUND: No evidence of any snowmaking start date, early/preview-access announcement, or contingency plan for an opening ahead of Nov 26, 2026; no confirmation that the new Lookout Express/Christmas lifts have completed testing/commissioning as of late September 2026; no Kalshi-specific settlement precedent for prior-year Bald Mountain "before date" contracts.
3. Forecasters 5 draws · Opus 5.5 + GPT-5.6 Sol · plain mean
claude-opus-5-5
80% conf
| Yes | 4% |
| No | 96% |
(0) Nothing is resolved yet. The resolution source shows Bald Mountain at 0/0 lifts open as of Sept 29, and no source shows opening operations. (a) About 7.5 weeks remain until the Nov 22 cutoff; public skiing would have to start by Nov 21. (b) Status quo is No. Sun Valley's official Opening Day page and its season preview both set opening for Nov 26, 2026 (Thanksgiving), four days after the cutoff, and the resort says it opens on Thanksgiving 'like every year.' (c) NO: the resort holds to its Nov 26 plan or slips later, as it did last year to Dec 3. This is more likely given lift construction still underway and OpenSnow's drier early-season signal for southern Idaho. (d) YES: an unusual early cold snap plus the upgraded pumphouse snowmaking lets Sun Valley open a lift early, as in 1991 (Nov 16). That has no analog in the modern era, and the resort's marketing is anchored to Thanksgiving. The Kalshi price is 7% but thinly traded (2/92 spread), and the research gives specific reasons (a fixed Thanksgiving tradition and a Nov 26 official date) to shade below it, to about 4%.
claude-opus-5-5
80% conf
| Yes | 4% |
| No | 96% |
(0) Nothing has resolved yet: the resolution source (sunvalley.com mountain report) shows 0/0 lifts open on Sept 29, 2026. (a) About 7.5 weeks remain until the Nov 22 cutoff; Bald Mountain would have to open by Nov 21 ET. (b) Status quo is No. The resort's official Opening Day page and its 91st-season release both set Nov 26, 2026 (Thanksgiving), four days after the cutoff, and state it opens on Thanksgiving 'like every year.' (c) No scenario: Sun Valley opens on Nov 26 as planned, or slips later as it did in 2025 (to Dec 3). Unfinished Christmas/Lookout lift construction and OpenSnow's drier early-season signal for Southern Idaho add further downside to any early opening. (d) Yes scenario: an unusually early cold snap in late October or early November, combined with the upgraded pumphouses and snowmaking, lets the resort open early, as it did on Nov 16, 1991. Nothing like that has happened in roughly 35 years. The Kalshi anchor is 7%, but the spread (2/92) is extremely wide, so the price is weak evidence. The resort-specific announced date and Thanksgiving tradition justify trimming slightly below it.
claude-opus-5-5
80% conf
| Yes | 4% |
| No | 96% |
(0) Not resolved. The resolution source's mountain report shows Bald Mountain with 0/0 lifts open as of late September, and nothing indicates an opening. (a) About 7.5 weeks remain until the Nov 22 cutoff, so the resort would need to open on or before Nov 21 Eastern Time. (b) Status quo: Sun Valley's official Opening Day page and its 2026-27 season preview both say opening day is Nov 26 (Thanksgiving), 'like every year', and third-party trackers list the same date. That is four days after the cutoff, so an on-schedule season resolves No. (c) NO scenario: normal or dry early-season weather, which OpenSnow's drier Nov-Dec El Niño signal for southern Idaho supports, along with ongoing lift construction and the Thanksgiving tradition, leads to an opening on Nov 26 or later, as in 2025 when it slipped to Dec 3. (d) YES scenario: an unusually early cold snap plus the upgraded snowmaking pumphouses lets the resort jump ahead, as in the 1991 Nov 16 opening, which is the only precedent in 35 years. Even then, Sun Valley's Thanksgiving-anchored marketing makes an earlier open unlikely. The Kalshi price of 7% is a thin quote (bid 2 / ask 92). Given the announced date and the base rate of recent openings from Nov 23 to Dec 3, I shade slightly below it to about 4%.
gpt-5.6-sol
79% conf
| Yes | 5% |
| No | 95% |
(0) The condition has not been met: Sun Valley’s September 28 mountain report shows zero lifts and terrain open, although its inconsistent timestamp creates minor source-lag risk; qualifying public downhill operations would still need to begin by November 21 Eastern Time. (a) There are about 53 days from September 29 through the final qualifying calendar day. (b) If nothing changes, the official November 26 opening date confirmed by Sun Valley’s Opening Day page produces No because it is four days after the cutoff. (c) No results if the resort follows its announced Thanksgiving schedule or suffers any delay, as occurred when warm weather pushed the 2025 opening from November 27 to December 3. (d) Yes requires an exceptional early cold snap and snowfall, rapid use of upgraded snowmaking, and a decision to open qualifying terrain at least five days ahead of the announced date, resembling the rare November 16, 1991 opening. Kalshi’s current Yes price is 7%, but the official schedule, recent opening history, absence of early-opening preparations, and ongoing lift work support a modest move down to 5%, while the unusually wide 2%-92% bid-ask spread makes the displayed anchor less reliable.
gpt-5.6-sol
79% conf
| Yes | 5% |
| No | 95% |
(0) The condition has not already been met: Sun Valley’s September 28–29 mountain report shows zero lifts and terrain open, so qualifying public downhill operations must begin by November 21 Eastern Time for Yes. (a) About 53 days remain from September 29 to the last qualifying calendar day. (b) If nothing changes, the official Sun Valley Opening Day page’s November 26 date governs operations and the market resolves No, four calendar days after the stated cutoff. (c) No results if the resort follows its announced Thanksgiving schedule or opens later because of weather or unfinished lift work, as happened when the 2025 opening slipped from November 27 to December 3. (d) Yes requires an unusually early cold snap and snowfall, rapid use of the upgraded snowmaking system, and a decision to open qualifying passholder-accessible terrain at least five days ahead of the announced opening. The recent reference class strongly favors No: documented openings in 2022–25 occurred November 23 or later, while the identified pre-November-22 precedent dates to 1991. I anchor on Kalshi’s 7% Yes price but reduce it to 5% because the official November 26 plan, corroborating trackers, recent opening history, and ongoing infrastructure work all specifically weigh against an early opening, while preserving tail risk for favorable weather and a schedule change.
4. Final plain mean of 5 draws
4%
(80% confidence)
Yes: 4%
No: 96%
Mean of 5 draws (0.04, 0.04, 0.04, 0.05, 0.05). (0) Nothing is resolved yet. The resolution source shows Bald Mountain at 0/0 lifts open as of Sept 29, and no source shows opening operations. (a) About 7.5 weeks remain until the Nov 22 cutoff; public skiing would have to start by Nov 21. (b) Status quo is No. Sun Valley's official Opening Day page and its season preview both set opening for Nov 26, 2026 (Thanksgiving), four days after the cutoff, and the resort says it opens on Thanksgiving 'like every year.' (c) NO: the resort holds to its Nov 26 plan or slips later, as it did last year to Dec 3. This is more likely given lift construction still underway and OpenSnow's drier early-season signal for southern Idaho. (d) YES: an unusual early cold snap plus the upgraded pumphouse snowmaking lets Sun Valley open a lift early, as in 1991 (Nov 16). That has no analog in the modern era, and the resort's marketing is anchored to Thanksgiving. The Kalshi price is 7% but thinly traded (2/92 spread), and the research gives specific reasons (a fixed Thanksgiving tradition and a Nov 26 official date) to shade below it, to about 4%.
Pipeline Timing
Total pipeline time: 87.2s
Per-tool research timings shown in the Research section above.