Upcoming Races in Boulder

The Boulder race calendar is busiest in September, May, and June. It covers a range of endurance sports — you'll find races in Running, Road Cycling, and Gravel — so there's usually a race near you. Distances span a wide range across those sports; you'll see Half Marathon, 5K, 25–50 mi, 50–100 mi, and 100+ mi, along with other popular distances.

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.