Upcoming Duathlons in Colorado

Endurance Grid lists 3 duathlons in Colorado, from September 2026 to June 2027 across 3 cities.

3
Races
3
Cities

The lay of the land

Duathlon Races in Colorado

The duathlon race calendar in Colorado is busiest in February, June, and September.

What a duathlon is

A duathlon is a triathlon without the swim: you run, transition to the bike, ride, then transition back and finish on foot. Two disciplines, two timed transitions, no open water — which makes it one of the most accessible ways into multisport racing.

Most US duathlons run one of two distances. A sprint is roughly a 5K run, 20K bike, and 2.5K run — short enough to finish on a first attempt. The standard, often called Olympic, doubles the front end to a 10K run, 40K bike, and 5K run. Exact distances vary by organizer.

Frequently Asked Questions

How many duathlons are in Colorado?
Endurance Grid's Race Calendar lists 3 upcoming duathlons in Colorado across 3 cities, from September 2026 to June 2027.
What duathlon distances are offered in Colorado?
Duathlons in Colorado include 70.3 and Olympic distances.
When is duathlon season in Colorado?
Duathlon season in Colorado runs spring through fall. Of the upcoming duathlons on Endurance Grid's Race Calendar, the most are in February and June.
Which Colorado cities have duathlons?
Duathlons in Colorado are held in Alma, Englewood, and Estes Park.

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