Running events in Denver–Boulder, CO

There are 160 upcoming running events listed in Denver–Boulder between July 2026 and July 2027. The next race is Spirit of the West 5K Run/Walk on Sun, Jul 26, 2026. Every listing includes the date, venue, distances, and a direct registration link.

The Front Range is America's trail-running capital — altitude, 300 days of sun, and instant foothills access — with road racing peaking at the Bolder Boulder 10K each Memorial Day and a deep trail calendar from spring through fall.

Showing the next 100 of 160 races

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Calendar updated Sun, Jul 26, 2026. Missing a race? Add it free.

Run with a crew

Miles are better shared — 17 running clubs in Denver–Boulder welcome new faces at their group runs.

Races by month

August 2026 (32) September 2026 (35) October 2026 (27) November 2026 (19) December 2026 (13) January 2027 (6) February 2027 (5) March 2027 (3) April 2027 (6) May 2027 (6) June 2027 (4)

Seasonal race guides

Nearby race calendars

Browse by distance

Looking beyond Denver–Boulder? See 5K races near you, 10K races near you, half marathons near you, marathons near you, trail races near you.