Triathlon / Duathlon Venues in Colorado
Triathlon and duathlon venues in Colorado come in a few shapes, and this page lists them all: reservoirs and lakes with open water swim courses, recreation centers that host pool swim sprint races, and parks that serve as transition areas and run courses.
The outdoor multisport season usually runs from late spring through early fall, when water temperatures and weather cooperate. Early season races may use pools or be run as duathlons, and wetsuits are common in Colorado’s cool reservoirs. Altitude, wind and steep climbs make many courses challenging, which is part of the appeal. Indoor triathlons at rec centers give beginners a low pressure way to try the sport in the off season.
Open a venue to see its setting and upcoming races. Race directors can add a race free on CUP and reach multisport athletes across Colorado.
Triathlon / Duathlon FAQ
What is a duathlon?
A duathlon is a run, bike, run race with no swim. It is a common option early or late in the season.
Do I need a wetsuit for Colorado triathlons?
Often yes, since many reservoirs stay cool. Check each race’s water temperature rules.
Are there beginner triathlons in Colorado?
Yes, sprint and pool swim races are popular first triathlons. Many events have beginner waves.
Hosting an event at one of these venues? List it free on Colorado Under Par.

