Endurance Grid lists 5 races in Boulder, Colorado, from October 2026 to June 2027.
The Boulder race calendar is busiest in October, May, and June. Every race here is a running event, so there's usually one near you. You'll see distances like 5K, 2 Mile / 3K, and 1K.
Weather on race day varies by time of year, so it lives where it’s accurate — each race page shows that race’s typical high, low, and rain chance from NOAA climate normals for its venue and date.
Population
106,274
as of 2023
City Elevation
5,438 ft
Nearest Airport
BJC
Rocky Mountain Metropolitan Airport
Time Zone
Mountain Time
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Explore and filter upcoming endurance races in Boulder, Colorado on the map below — by sport, distance, price, or month.