State of US Marathons 2027: The Data Behind 114 Races

The typical US marathon is small — much smaller than you think

Media coverage is dominated by the giants, so most runners picture a marathon as 50,000 people crossing a bridge. The data says otherwise: across the 92 races in our database with verified field sizes, the median field is 1,646 runners. Six in ten US marathons (60.9%) field under 2,000 people. Only two races top 50,000 — New York (59,000) and Chicago (54,000) — and just 7 of 92 reach 20,000 or more.

Practical consequence: if you want a marathon where you park 200 meters from the start line and never weave through a crowd, you have 56 races to choose from — they just don't advertise on your feed. All of them are in the US marathon calendar.

What a US marathon actually costs in 2026-2027

Across 100 races with verified USD entry fees, the median is $149, with the middle half falling between $120 and $175. The tails are wide: San Francisco tops the set at $458.84 (all-in, processing fees included), while Pocatello costs $70 — a 6.5× spread for the same 26.2 miles. Fifteen percent of races now charge $200 or more; only 9% stay under $100.

For context, RunDida's global fee-inflation index — built from 31 races with multi-year official price points — puts marathon entry inflation at +4.9% per year (median +4.0%, as of August 2026), well above general consumer inflation. A US-only sub-index needs at least 8 races with three or more verified annual price points; we have 7, so we report the global figure rather than fake a national one.

The calendar: October owns the sport, August is empty

October hosts 23 of 114 races — one in five. Fall (September through November) carries 41.2% of the US calendar. But the spring block (March–May) is closer than the stereotype suggests at 35.1%, led by May (16) and April (15). The true dead zone is high summer: August has one race in the entire set, and June–July together have seven — almost all of them in Alaska, the Pacific Northwest, or at altitude, where summer heat doesn't kill a marathon. Next season's confirmed dates collect on the 2027 marathon calendar.

The 2027 BQ downhill rule barely touches the mainstream calendar

From the 2027 qualifying cycle, the B.A.A. docks verified times from steep net-downhill courses: +5:00 for 1,500–2,999 ft of net drop, +10:00 for 3,000–5,999 ft, and no acceptance at 6,000 ft or more. The headlines made it sound like the end of fast marathons. The data disagrees: of 68 US courses with verified net-drop figures, exactly 3 take a penalty — St. George (2,559 ft, +5:00), Mt. Charleston (5,102 ft, +10:00) and REVEL Big Cottonwood (5,259 ft, +10:00). The next-closest course, Tucson, sits about 7 ft under the line after deliberately re-tuning its route. Zero mainstream US marathons are rejected outright.

The median US course gains just 178 m over 42.2 km, and 22% gain under 100 m — functionally flat. If you are hunting a clean BQ course, the constraint was never the rule; it's picking from the downhill races that stay under the penalty line or the dozens of genuinely flat ones in the full US ranking.

Race-day weather: most of the calendar sits in the PR window

We derived race-day climate for 56 US marathons from 20 years of NASA POWER daily data (2005–2024), using a ±7-day window (15 days) around each race's reference date. The median race-day mean is 12.4°C (54°F), and 62.5% of races land inside the 8–14°C band where most distance PRs happen. The five hottest race days in the set — Kauai (26.3°C), Kona (25.6°C), Maui (24.2°C), Honolulu (23.9°C) and Miami (21.6°C) — are all destination races where the heat is the deal you accept for the setting. The coldest — Madison (2.0°C), Seattle (4.6°C) and Philadelphia (5.4°C) — cluster in late November, when a PR-friendly start can turn into a cold finish for 5-hour runners; Equinox (5.0°C) is the outlier, a September race where interior Alaska's latitude does the work.

Methodology

Counts come from the RunDida marathon database: 114 US marathon series, using each race's latest confirmed edition as of August 2026. Field sizes n=92, entry fees n=100 (USD domestic; 89 verified against official race sources, 3 from news or archive records, 8 from listed prices pending verification; tiers vary by race and 15 of 100 include processing fees — spreads between individual races partly reflect those differences), net-drop figures n=68, elevation gain n=112, climate n=56. Race-day climate is computed from NASA POWER daily meteorology, 2005–2024, 7-day window per race. B.A.A. downhill adjustment thresholds are taken from the official 2027 qualifying announcement. Every statistic on this page is reproducible from the underlying per-race pages; sample sizes are stated per metric because coverage differs — where coverage sits below our own publication threshold (a US-only fee-inflation sub-index needs 8 qualifying races; we have 7) or where a field is held to a machine-only verification standard not yet cleared for publication (per-race finisher counts), we say so instead of estimating. Field sizes throughout this page are registration capacity, not finisher counts — the two are never interchanged.