Boulder Marathons Events

Tri Boulder Sprint, Olympic & Long Course

Boulder Reservoir 18 Jul 2026

Boulder Peak Triathlon, Duathlon, & Aquabike

Boulder Reservoir 12 Jul 2026

Boulder Sunrise Triathlon

Boulder Reservoir 28 Jun 2026

Boulder Rez Marathon

Boulder Reservoir 15 Aug 2026

A Running Mechanics Clinic with Bobby McGee

East Boulder Community Center 27 Jun 2026

Grit2Greatness Endurance Training Camp 2026 - Boulder, CO

Boulder Reservoir 25 Jun 2026

Plant Forward Boulder Potluck: Dine with a Dietician

NoBo Library - Boulder Public Library District 21 Jun 2026

Day of the Dog Virtual Race 1M 5K 10K 13.1 26.2

Boulder 22 Aug 2026

Lavender Virtual Race 1M 5K 10K 13.1 26.2 | Language of Flowers Collection

Boulder 27 Jun 2026

Memorial Day 1M 5K 10K 13.1 26.2

Boulder 25 May 2026

2026 Born to Be a Princess 1M 5K 10K 13.1 26.2 - Now Only $16!

Boulder 1 Nov 2026

Cat Day Virtual Race 1M 5K 10K 13.1 26.2

Boulder 9 Aug 2026

Unhinged and Feral 1M 5K 10K 13.1 26.2 - Now Only $18!

Boulder 3 Oct 2026

2026 Race to Read 1M 5K 10K 13.1 26.2

Boulder 6 Mar 2026