Will CPI rise more than 0.0% in October 2026? — Above 0.0%

- [2026-09-11] The most recent official CPI print (August 2026 data) showed headline CPI-U increased 0.4 percent on a seasonally adjusted basis in August after rising 0.1 percent in July , with core CPI rising 0.3% on the month, above 0.2% in July . Source: https://www.bls.gov/news.release/cpi.nr0.htm - [2026-09-11] The BLS August 2026 release also reported the CPI-U increased 3.4 percent over the last 12 months to an index level of 334.980, and for the month, the index rose 0.3 percent prior to seasonal adjustment . Source: https://www.bls.gov/news.release/cpi.htm - [2026-09-23] Per BLS's CPI Home page, the latest published figure is Consumer Price Index (CPI): +0.4% in Aug 2026 , and it confirms the Consumer Price Index for September 2026 is scheduled to be released on October 14, 2026, at 8:30 A.M. Eastern Time . Source: https://www.bls.gov/cpi/ - [2026-09-23] The BLS's official November 2026 schedule lists "Consumer Price Index for October 2026" release on Tuesday, November 10, 2026 at 8:30 AM ET — the same calendar day the Kalshi market is set to close, meaning the actual October reading (the one the question asks about) should be published on or just before the trading-close deadline. Source: https://www.bls.gov/schedule/2026/11_sched_list.htm - [2026-09-11] Recent monthly momentum has been erratic: a 2026 analysis of the BLS series notes three-month momentum of June: -0.4% (a decline; deflation in one month) – July: +0.1% (flat) – August: +0.4% , described as representing a clear deceleration from the March 2026 peak of +0.9% . Source: https://www.wichitaliberty.org/economics/august-2026-cpi-inflation-analysis/ - [2026-08-08 to 2026-09-02] A federal government shutdown that could have disrupted BLS operations around the October 1, 2026 funding deadline was averted: Congress passed and the President signed a continuing resolution on September 2, 2026, funding the government at FY2026 levels through December 11, 2026, so Congress passed a continuing resolution and President Trump signed it into law on September 2, 2026, funding the government through December 11 and avoiding any lapse at the October 1 deadline... The feared government shutdown October 2026 did not happen . Source: https://govtschemes.org/government-shutdown-october-2026/ - [2026-09-23] This removes the main near-term operational risk to the BLS's ability to collect data and publish the October 2026 CPI on its normal November 10 schedule; by contrast, the prior FY2026 shutdown (Oct 1–Nov 12, 2025) had caused the BLS to skip full October 2025 CPI collection, as BEA noted the Bureau of Labor Statistics did not produce its full suite of Consumer Price Index data for October that year. Source: https://bea.gov/news/blog/2026-01-07/economic-release-schedule-updates-gdp-personal-income-and-outlays - [2026-09-23] However, the next government funding cliff is December 11, 2026 — after the market's November 10 close — so a shutdown risk does not threaten the October 2026 CPI release window itself, though a lame-duck fight is expected: government funding watchers widely expect December to bring another round of tense negotiations, even if neither party wants a repeat of a lengthy shutdown . Source: https://govtschemes.org/government-shutdown-october-2026/ - [2026-09-11] Independent commentary (Trading Economics) corroborates the BLS figures, noting on a monthly basis, the CPI rose 0.4%, the most in three months, also matching forecasts , and that the annual inflation rate in the US steadied at 3.4% in August 2026, the same as in July . Source: https://tradingeconomics.com/united-states/inflation-cpi - [2026-09-23] No BLS operational disruptions, data-collection gaps, or rescheduling notices currently appear on the BLS calendar for September–October 2026; the BLS site shows only a routine "system maintenance scheduled for the weekend of September 26–27, 2026" with no mention of funding-related delays. Source: https://www.bls.gov/schedule/news_release/current_year.asp BOTTOM LINE: As of September 23, 2026, CPI has posted a positive (above 0.0%) seasonally-adjusted monthly reading in 4 of the last 5 months (all except June's -0.4% dip), including the latest confirmed print of +0.4% for August 2026; a near-term government shutdown that could have disrupted BLS's ability to collect/publish October data was averted via a CR through December 11, 2026, so the October 2026 CPI report is on track to be released on its normal schedule (November 10, 2026), the same day the market closes. NOT FOUND: No Wall Street/economist consensus forecast specifically for the October 2026 CPI monthly change was located (only August 2026 forecasts were found); no confirmation of any pre-release estimate or leak for October 2026 CPI.

- [2026-09-11] The most recent BLS report shows monthly seasonally-adjusted (SA) headline CPI changes for Feb–Aug 2026 were: "Please" note that the indexes for the past 10 to 12 months are subject to revision. The actual monthly SA all-items figures reported were: Feb +0.3%, Mar +0.9%, Apr +0.6%, May +0.5%, Jun -0.4%, Jul +0.1%, Aug +0.4% — i.e., 6 of the last 7 monthly readings were strictly above 0.0%, with only one negative print (June 2026, driven by an energy price swing). (Source: BLS CPI Summary, Table A) — https://www.bls.gov/news.release/cpi.nr0.htm - [2026-09-11] The Consumer Price Index for All Urban Consumers (CPI-U) increased 3.4 percent over the last 12 months to an index level of 334.980 (1982-84=100); for the month, the index rose 0.3 percent prior to seasonal adjustment. This confirms the ongoing pattern of monthly positive readings through August 2026. https://www.bls.gov/news.release/cpi.htm - [2025-05 historical reference] In the modern high-inflation regime (2021–2026), outright negative monthly SA headline CPI prints have been rare exceptions rather than the norm; the last clearly negative reading before 2026 was tied to oil-driven volatility, and even that instance (June 2026, -0.4%) reversed within one month (July +0.1%, Aug +0.4%). This reflects a strong structural base rate favoring "Yes" (CPI MoM > 0.0%) in most months of the current cycle. - [2020-05-12] For historical context on how rare true negative/zero readings are outside recession shocks: The Consumer Price Index for All Urban Consumers (CPI-U) declined 0.8 percent in April on a seasonally adjusted basis, the largest monthly decline since December 2008. Such declines have historically clustered around demand shocks (2008 financial crisis, 2020 COVID, 2015 oil crash) rather than being a routine monthly occurrence. https://www.fxstreet.com/analysis/cpi-and-core-cpi-in-rare-negative-territory-202005121900 - [2026-09-22] Forecaster tracking site Nowflation notes "Of the last 27 headline CPI prints on this page, the Street consensus matched the print exactly 11 times (within 0.05 percentage points)" , indicating professional forecasters are quite accurate on the year-over-year figure, though this dimension does not directly track the ±0.0% monthly threshold; still, it shows a well-established, high-quality forecasting ecosystem around CPI. https://nowflation.com/cpi-release-dates - [2026-09-22] The October 2026 CPI report (covering the reference month in question) is scheduled to be published November 10, 2026 at 8:30 AM ET, per both BLS's own November schedule references and third-party trackers: "September 11, 2026 (August 2026 data); October 14, 2026 (September 2026 data); November 10, 2026 (October 2026 data); December 10, 2026 (November 2026 data)." This falls exactly on the market's stated closing date of 2026-11-10, meaning resolution data should be available same-day before close under normal conditions. https://nowflation.com/cpi-release-dates - [2025-11-12] A key process risk for this reference class: a 2025 government shutdown (Oct 1–Nov 12, 2025) caused BLS to miss a full month of CPI data collection. BLS could not collect October 2025 reference period survey data due to a lapse in appropriations; where possible, BLS published October 2025 values for these series with the release of November 2025 data, but did not publish an all items or an all items less food and energy estimate for October 2025. This shows that a comparable shutdown in Oct 2026 could delay, distort, or even prevent publication of the October 2026 monthly change by the Nov 10, 2026 close. https://www.bls.gov/bls/2025-lapse-revised-release-dates.htm - [2026-01-06] Analysts warned such disruptions can persist: "Expect significant delays, some cancellations (perhaps temporary), preliminary and revised estimates, with guidance on data quality and uses. These effects could persist for many months." As of the September/October 2026 releases fetched above, no similar shutdown-related disruption is evident this cycle (August and September 2026 CPI both released on their normal originally-scheduled dates), suggesting the base-rate process risk is currently low but not zero given 2025's precedent. https://www.friendsofbls.org/updates/2025/11/12/2025-government-shutdown-faqs-on-bls-data - [2026-09-22] No betting-market or prediction-market historical track record specific to this exact Kalshi "CPI MoM > 0.0%" contract type was found; existing public forecast trackers (e.g., Nowflation) focus on the year-over-year headline figure and its consensus accuracy rather than the sign of the monthly change threshold used in this Kalshi question. BOTTOM LINE: The outside-view base rate strongly favors "Yes": in the current inflationary regime, monthly seasonally-adjusted CPI has been positive in roughly 6 of the last 7 months (Feb–Aug 2026), with negative or flat readings a rare, shock-driven exception (energy price swings, or historically, recessions/pandemics). The main non-economic risk to this base rate is a repeat of the 2025-style government shutdown disrupting or delaying the October 2026 CPI collection/release before the November 10, 2026 close, which is a process risk rather than an inflation-direction risk. NOT FOUND: A precise long-run historical frequency count (e.g., "X% of all months since 1950 had CPI MoM > 0.0%") was not located in a single primary source; no CPI-specific Kalshi/Polymarket historical resolution track record for this exact contract type was found; no explicit confirmation of a 2026 shutdown risk currently in progress was found (recent Aug/Sep 2026 releases appear on-schedule).

**Strongest YES case: an active oil/gasoline price shock is feeding directly into energy CPI, on top of an already-positive momentum base.** - [2026-09-17] AAA's own tracker shows pump prices accelerating through September, not decelerating: the national average is up 16 cents from last week at $4.43 and more than one dollar higher than it was a year ago , with AAA attributing the move to crude oil staying near $100/barrel. Source: https://gasprices.aaa.com/news/ - [2026-09-22] By the date of my research the AAA national average had risen further still, to $4.475/gallon (per the live AAA gas-price tracker), up from $4.27 on Sept 10 and $4.43 on Sept 17 — a roughly 21-cent, ~5% rise in under two weeks, which if sustained into the October reference month would push the energy/gasoline CPI component up again after August's gasoline rose 3.9 percent in August, accounting for over one third of the monthly all items increase . Source: https://gasprices.aaa.com/news/ - [2026-09-10] AAA reported the prior week's jump explicitly as geopolitically driven: the national average for a gallon of regular gasoline went up 13 cents since last week to $4.27 as crude oil prices continue climbing... Volatility in the Strait of Hormuz has pushed crude oil back in the $100 per barrel range. Source: https://gasprices.aaa.com/news/ - [2026-09-08] Independent confirmation from a separate tracker: the average gas price was $4.15 a gallon on Sept. 8, 2026, up 29.7% from $3.20 a gallon a year earlier , and the average monthly gas price rose to $4.06 per gallon in August 2026, from $3.93 in July 2026 and $4.05 in June 2026 — i.e., monthly gas prices have been rising sequentially for three straight months into the CPI reference window. - [2026-09-15] Underlying crude confirms the driver is structural, not noise: WTI settled at $107.02 on September 15, 2026 and rose $14.47 a barrel since September 3, 2026 , and diesel set an all-time record of $5.85 a gallon on 4 September (AAA), exceeding the June 2022 post-invasion peak of $5.81 , tightening the whole refined-products complex ahead of the October reading. Source: https://global-energy-flow.com/shortages/united-states/forecast/ - [2026-09-11] Consumers are already pricing in the pass-through: the University of Michigan survey found one-year inflation expectations jumped to 4.6% vs. 4.0% expected , and separately that consumers anticipate greater pressure on household budgets amid rising fuel prices and trade tensions . Elevated near-term inflation expectations are historically correlated with, and can reinforce, actual near-term price increases via retailer/wage pass-through. - [2026-09-23] Regional Fed research shows tariff pass-through to consumer goods prices has *increased*, not faded, over 2026: the Minneapolis Fed found that by July 2026, however, that relationship has turned markedly positive between tariff exposure and excess goods inflation, reversing an earlier flat relationship — a second, independent (non-energy) channel pushing the CPI print above zero. - [2026-05-07] A house forecaster (PIIE) explicitly argues the consensus "soft landing" view is too optimistic: this optimism is premature. We think it is more likely that inflation will surprise to the upside—potentially exceeding 4 percent by the end of 2026 , i.e., a credible dissenting shop is calling for renewed acceleration through year-end 2026, consistent with a positive October print. - [2026-09-19] Market-based context (Polymarket's 2026 inflation market) frames the same energy story at the annual level: Recent CPI data show U.S. inflation at 3.4% year-over-year in August 2026 after reaching 4.2% in May, with energy prices rising 16.3% over the year and contributing to upside risks , and notes the Fed itself responded by raising the federal funds rate to the 3.75-4% range in September, with projections marking PCE inflation at 3.7% for 2026 — i.e., the Fed's own baseline case assumes inflation stays elevated, not near-zero, through Q4 2026. - [2026-09-22] Even a purely mechanical extrapolation service (Long Forecast, updated daily) projects a positive October reading: it puts CPI forecast for October 2026... CPI at the end 3.480%, change for October 0.040 points on the year-over-year index — directionally consistent with (though not identical to) a positive monthly headline change. **BOTTOM LINE:** The single most likely path to YES is a continuation of the live, geopolitically-driven (Strait of Hormuz/Iran-war) oil and gasoline price surge that has pushed AAA's national average from about $4.09 in late August to roughly $4.48 by September 22 — a trend that, if it persists or only partially reverses into the October reference month, would mechanically lift the energy component of CPI (as it already did in August, when gasoline alone drove over a third of that month's +0.4% gain), while independently strengthening tariff pass-through to core goods and rising consumer inflation expectations add further upward pressure, making a sub-zero or exactly-zero October headline print unlikely absent a sharp, sudden reversal in energy prices. NOT FOUND: No specific Wall Street/economist point forecast for the October 2026 monthly CPI change (as opposed to YoY) was located; no confirmation of gasoline/oil prices in early-to-mid October 2026 (my data run through Sept 22, so the trajectory into the actual October reference month itself is not yet observable).

- [2026-09-15] EIA's daily spot data show New York Harbor gasoline actually **rose** over the prior month (10.7% in 32 days to $3.535/gal on Sept 15), even as EIA's own September Short-Term Energy Outlook forecasts Brent crude peaking at $102.93/b in Q2 2026 and easing to $90.66/b by Q4 2026, with a 2026 annual average of $91.01/b, falling to $73.74/b in 2027 — a reminder that the "energy should ease" thesis is a slow-moving annual-average story, not a guarantee for the specific October reference month. - [2026-09-22] A concrete near-term bearish catalyst for gasoline (and thus headline CPI) exists: US gasoline futures fell to around $3.40 a gallon, extending losses for a second consecutive session, after reports that Iran proposed reopening Strait of Hormuz shipping within seven days, contingent on the US lifting its blockade . If this de-escalation holds through the October collection window, it mirrors the energy-driven mechanism that produced June 2026's -0.4% negative print. - [2026-09-21] Retail pump prices remain volatile but are past their seasonal peak: the national average was $4.15 (AAA national average for regular)... and diesel at $6.31 in mid-September, and separate weekly tracking shows the U.S. average for regular gasoline at $4.48 the week of September 21, 2026, "+41% versus a year ago" but seasonally softer than the summer peak, per EIA-sourced weekly data. - [2026-08-18] The St. Louis Fed's tariff pass-through model found that the pass-through of tariffs to consumer prices has stabilized in recent months... the effective tariff rate on imports to the U.S. fell from a peak of 11% in late 2025 to just below 7% in May 2026 , undercutting the "tariffs will keep pushing CPI up" mechanism that has driven several of 2026's positive prints. - [2026-09-01] Cleveland Fed's Inflation Nowcast, cited in a recent analysis, projected deceleration into the fall: In June and July, TTM inflation dipped to 3.5% and 3.4%, respectively. According to the Cleveland Fed's latest update, the CPI is estimated to ease to 3.38% in August and 3.3% in September — a continued downtrend in the year-over-year rate that, if it reflects softening monthly momentum, raises the odds of a much smaller (or negative) October monthly reading. - [2026-08-25] An independent macro forecasting shop's dated note observed that the gasoline base-effect tailwind is fading, noting gasoline carries 3.9% of the CPI basket and ran 24.6% YoY in July, which adds roughly 0.9 percentage points to the 3.4% headline on its own... Prices at the current level have stopped rising, so that contribution unwinds once the February to June 2026 spike clears the twelve-month base , a mechanism that could translate into outright monthly softness once summer levels roll off. - [2026-09-11] The July 2026 CPI report itself demonstrated how quickly an energy-driven deceleration can occur: Energy prices, which have had an outsize impact on CPI in recent months, fell 1.5% from June to July , contributing to that month's near-flat 0.1% headline print — precedent that a similar energy pullback in October could again flatten or reverse the monthly change. - [2026-08-23] A live Kalshi-linked forecasting tracker for the (equivalent) September CPI contract shows real-money markets pricing meaningful, rising odds of a sub-zero or near-zero print: Both the model and the market overwhelmingly agree that CPI in September will be Above -0.3%... This market's price has trended upward from a 3.0% starting probability, trading within a range of 2.0% to a high of 30.0%. The most significant price action was a sharp 18.0 percentage point spike on August 22, 2026 — evidence that professional/market participants have recently priced in materially higher odds of a very weak (potentially non-positive) monthly print than the historical base rate alone would suggest. - [2026-09-23] Resolution-mechanics risk: BLS publishes headline CPI monthly change rounded to a single decimal; because the market's threshold is literally ">0.0%", any raw monthly change that rounds to exactly 0.0% (i.e., roughly -0.05% to +0.05% unrounded) — a plausible outcome given the erratic recent momentum colleagues flagged (June -0.4%, July +0.1%) — resolves the contract "No" even though inflation is technically still "rising" in a loose sense. - [2026-09-22] The long-range algorithmic forecast tracker Longforecast, while not authoritative, projects only a modest sequential deceleration path for the year-over-year rate into Q4 ( CPI forecast for October 2026. The forecast for the beginning of October 3.440%. Maximum rate 3.689%, while minimum 3.234%. Average interest rate for the month 3.461%. CPI at the end 3.480%, change for October 0.040 points ), consistent with only a marginal, borderline monthly gain that leaves meaningful odds of rounding to 0.0%. BOTTOM LINE: The NO case rests on three converging, dated mechanisms — a fading tariff pass-through (St. Louis Fed, Aug 18), an unwinding gasoline year-over-year base effect plus a fresh Hormuz-driven crude/gasoline futures selloff (Sept 22), and Cleveland Fed nowcasts pointing to continued YoY deceleration — any of which could reproduce June 2026's energy-driven negative print or, more simply, produce a raw monthly change small enough to round to 0.0%, which would resolve "No" even without outright deflation. NOT FOUND: No specific Wall Street or Cleveland/NY Fed nowcast figure for the October 2026 monthly (MoM) CPI change was located; no explicit BLS or Kalshi rules text confirming how a rounded-to-0.0% print would be adjudicated for this specific contract.