Boulder Running Events

Boulder Peak Triathlon, Duathlon, & Aquabike

Boulder Reservoir 12 Jul 2026

Colorado Triathlon (Sprint, Olympic, Duathlon, & Aquabike)

Boulder Reservoir 6 Jun 2026

Boulder Rez Half Marathon

Boulder Reservoir 11 Apr 2026

Chelsea Sodaro: An Unlikely Journey to Triathlon, Motherhood, and Ironman World Champion

Chautauqua Community House 18 Mar 2026

Boulder Bubbleicious Bubble Run

Boulder, Colorado, USA 11 Jul 2026

Lucky Leprechaun 5K

Twisted Pine Brewing 14 Mar 2026

2026 Boulder Polar Plunge presented by Spectrum

Boulder Reservoir 4 Apr 2026

Harvest Moon Long Course Triathlon

Boulder Reservoir 31 May 2026

2026 World Cancer Day 1M 5K 10K 13.1 26.2

Boulder 1 Feb 2026

2026 Full Moon Challenge 12K and 12M

Boulder 7 Feb 2026