Observed arrival · 2026-09-13

Marathon Pacing Study

splithappens.run Observed source

Editorial interest 86/100 Selection signal · not a rating of the site

An open-data exploration of how marathon pacing, weather, courses, age groups, and checkpoint times shape race outcomes.

Landing page captured for the 2026-09-13 issue.

Field notes

The study breaks marathon results into section-level questions rather than treating finish time as the whole result. Its comparisons include checkpoint entries at 12.43, 18.64, and 21.75 miles, temperature and wind bands, supplied elevation profiles, and prior performances. The homepage reports 3,517,336 complete finishes from 29 cities, including a four-hour-marathon slice of 453,052 results. Methods, sources, a research archive, and a data download are linked from the site.

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