Denver
Triathlon Calendar near Denver 2026-2027
Monthly updates for Denver
Get new running races (and updates) in your inbox every month.
Explore the top triathlons near Denver for 2026-2027! We've gathered 4 exciting races in the area. Check out our detailed list below to find your next local race.
August 2026
A multi-format triathlon at Boulder Reservoir on August 29, 2026 featuring a sunrise swim, fast bike and smooth run with the Flatirons in view. Sprint, Olympic, aquabike, duathlon and relay options are available.
September 2026
A combined 5K trail run and 3K paddle at Chatfield State Park in Littleton, Colorado, with limited participant slots and paddleboard rentals available. Categories include men's, women's, and a couples relay where teammates split the run and paddle.
June 2027
IRONMAN 70.3 Boulder on June 12, 2027 features a reservoir swim, hilly bike and run at higher elevation near the Flatirons.
Monthly updates for Denver
Get new running races (and updates) in your inbox every month.