Longmont
Triathlon Calendar near Longmont 2026-2027
Monthly updates for Longmont
Get new running races (and updates) in your inbox every month.
Explore the top triathlons near Longmont 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
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 multi-discipline race at Boyd Lake State Park on September 27, 2026 featuring triathlon, duathlon, aquabike, SUP and aquathlon formats with on-site camping and USAT sanction.
October 2026
A high altitude swimrun in Fort Collins combining open water swims in Horsetooth Reservoir with trail runs in Lory State Park across three distances.
Mini Tri comp only on October 31, 2026 in Fort Lupton features 15 minute swim bike run slots, combined time scoring, and prizes for fastest time and costumes.
Monthly updates for Longmont
Get new running races (and updates) in your inbox every month.