The Consumer Price Index is the inflation print that matters most to the Federal Reserve's reaction function — and therefore to every asset price. It lands at 8:30am ET roughly twelve times a year, covering the prior month, and the minutes around it are among the most violent of any scheduled catalyst: in 2025–26, a 0.1pp upside surprise in core CPI has been worth about a 1% down-move in S&P futures before the cash open.
How the release works
The Bureau of Labor Statistics publishes CPI at 8:30am, simultaneously with a full sub-index breakdown. Headline CPI includes food and energy; core CPI excludes them and is what the Fed watches. The market compares both against consensus (compiled by surveys of economists in the days before). The surprise — not the number itself — drives the move, which is why the consensus is as much a part of the catalyst as the print.
The first reaction is in rates and index futures, within seconds. A hot core print reprices the expected fed funds path, lifts the dollar, hits long-duration growth stocks hardest. A cool print does the mirror image. The cash open at 9:30 often extends the move; by afternoon, the market is usually trading the next catalyst.
When CPI comes out in 2026
CPI follows a stable rhythm: each month's release covers the prior month, and lands mid-month on a schedule of roughly the 10th–13th. For 2026 the confirmed calendar is: Jan 13 (Dec), Feb 11 (Jan), Mar 11 (Feb), Apr 10 (Mar), May 12 (Apr), Jun 10 (May), Jul 14 (Jun), Aug 12 (Jul), Sep 11 (Aug), Oct 13 (Sep), Nov 10 (Oct), Dec 10 (Nov). Every release is 8:30am ET. CPI is never released on the same morning as FOMC decision days — the calendar deliberately separates its two biggest catalysts.
Reading the print in three numbers
You don't need the full table. Three numbers carry the day: core CPI month-over-month (the Fed's real target — consensus ±0.02pp is the swing factor), core year-over-year (the headline everyone quotes), and shelter month-over-month (the stickiest component; a soft shelter print can flip the whole reaction even when headline core is hot). Services ex-shelter is the fourth number Fed watchers quote to each other.
Trading around CPI days
Three habits help. First, check the consensus the afternoon before — the trade is long-vs-consensus, not long-vs-last-month. Second, expect options to be expensive into the print: implied volatility rises into 8:30am and collapses after, so buying protection the morning of is paying retail. Third, respect the two-sided risk: CPI days produce both the month's best and worst intraday reversals, and the initial move is wrong often enough that many desks simply wait for 9:30 before committing.
The dates are public a year in advance. There's no reason to be surprised by one.