Boulder
Triathlon Calendar near Boulder 2026-2027
Monthly updates for Boulder
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Explore the top triathlons near Boulder for 2026-2027! We've gathered 5 exciting races in the area. Check out our detailed list below to find your next local race.
August 2026
Family-focused gravel triathlon at Boulder Reservoir with Sprint, Super Sprint, Mini and SSS options for adults and children.
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 two-day trail and bike event in Estes Park featuring 31-mile bike and run options, a 15-mile heavy half, and a 62-mile duathlon, with rugged trails, significant climbs, and aid stations supporting competitors.
A lakeside multi discipline event at Boyd Lake State Park on September 27, 2026 offering sprint, supersprint, duathlon, aquabike, aquathlon and SUP race options.
October 2026
A competitive mini triathlon in Fort Lupton on October 31, 2026 featuring a 15 minute swim bike run time slot format for adults ages 18 to 99.