WIC total participation, March 2026

WIC participation tests whether agents can track benefit-program take-up, recertification, birth-cohort effects, and program-operation changes. This target resolves on 2026-07-31 under a fixed-vintage rule, with an expected ~3 months lag. The same series can also spawn next release, +3 months, child participation questions.

February 2026 total participation was 6.64 million. The agent splits the recent downward FY2026 trend against a possible March seasonal rebound.

The resolver is the USDA Food and Nutrition Service WIC Participation and Costs national monthly table, Total Participants, March 2026, first preliminary print. The forecast evidence excludes the March 2026 realized value and uses only the official source family, the prior official vintage, and earlier monthly observations.

Base-rate/reference-class view: a seasonal-naive prior starts from Feb 2026 and adds a typical February-to-March increase. In 2025 the increase was 48,661, while the recent March level range was 6,621,311 to 6,850,836 across 2023-2025.

Model prior: use a simple seasonal persistence model, averaging two anchors: Feb 2026 plus a roughly 45,000 March seasonal rebound, and Mar 2025 adjusted down by the Feb 2026 year-over-year shortfall versus Feb 2025. This intentionally avoids a more complex time-series model because only a small monthly official reference class is needed for this first-print target.

Current-release update: Feb 2026 at 6,640,819 was 161,356 below Feb 2025, so carrying the full year-over-year shortfall to March gives about 6,689,480. A direct Feb-to-Mar seasonal rebound anchor gives about 6,685,000. The point estimate is placed near the midpoint of those pre-release anchors.

Upside scenario: March administrative reporting catches up more than usual, participation retains more of the 2025 level, or state caseload timing adds a larger-than-normal seasonal bounce, putting the first print near or above 6.75 million. Downside scenario: the early-2026 decline persists, the March seasonal bounce is weak, or reporting delays hold the print near 6.60 million.

Point calculation: 0.5 * (6,640,819 + 45,000) + 0.5 * (6,850,836 - 161,356) = 6,687,650, rounded to 6,686,000 after a small downward adjustment for late-2025 and early-2026 softness. The 80% interval is 6,580,000 to 6,795,000, spanning roughly plus 154,000 and minus 106,000 around the point to cover recent first-print seasonal dispersion, reporting timing, and a mildly upside-skewed rebound risk.

Review disposition: Accepted the blocking leakage, update, interval, coherence, and model-prior critiques by removing the realized March 2026 value from evidence and historicalContext, widening the interval to ex-ante forecast uncertainty, and adding a seasonal-persistence prior. Kept the official resolver metadata and June 12 resolution source only for resolution clarity.