Running Events in Boulder

Check out happening running events all around Boulder, CO

Boulder Peak Triathlon, Duathlon, & Aquabike

 Sun, 12 Jul at 07:15 am Boulder Reservoir

Boulder Rez Half Marathon

 Sat, 11 Apr at 08:00 am Boulder Reservoir

2026 Boulder Polar Plunge presented by Spectrum

 Sat, 04 Apr at 11:00 am Boulder Reservoir

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

 Sat, 06 Jun at 07:15 am Boulder Reservoir

Dirt Circus Boulder

 Sat, 08 Aug at 08:00 am Runners Roost (Boulder)

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

 Wed, 18 Mar at 07:30 pm Chautauqua Community House

Boulder Bubbleicious Bubble Run

 Sat, 11 Jul at 12:00 pm Boulder, Colorado, USA

Wild Provisions 5k | Boulder | 2026 CO Brewery Running Series

 Sat, 27 Jun at 10:00 am Wild Provisions by 4 Noses Brewing Company USD 0 to 65

Lucky Leprechaun 5K

 Sat, 14 Mar at 04:00 pm Twisted Pine Brewing

CU Diabetes Link 5K

 Sun, 12 Apr at 09:00 am Visual Arts Complex, Department of Art & Art History USD 18 to 34

Be Kind to Your Mind 1M 5K 10K 13.1 26.2

 Sat, 02 May at 01:00 pm Boulder USD 4 to 42

Consider the Wildflowers 1M 5K 10K 13.1 26.2

 Sun, 01 Mar at 01:00 pm Boulder USD 4 to 42

2026 Be Brave 1M 5K 10K 13.1 26.2

 Sat, 07 Mar at 01:00 pm Boulder USD 4 to 42

Race for Love 1M 5K 10K 13.1 26.2

 Sat, 14 Feb at 01:00 pm Boulder USD 4 to 42

2026 New Year Challenge -Year of the Horse 2.026 Mile 20.26 Mile 202.6 MILE

 Sun, 15 Feb at 01:00 pm Boulder USD 4 to 42

2026 Taco Sloth 1M, 5K, 10K, 13.1, 26.2

 Sun, 22 Feb at 01:00 pm Boulder USD 4 to 42

Avery Spring 5k | Avery Brewing | 2026 CO Brewery Running Series

 Sun, 26 Apr at 10:00 am Avery Brewing Company USD 0 to 65

Memorial Day 1M 5K 10K 13.1 26.2

 Mon, 25 May at 01:00 pm Boulder USD 4 to 42

2026 First Responders 1M 5K 10K 13.1 26.2

 Sat, 28 Mar at 01:00 pm Boulder USD 4 to 42

2026 Race Alotl for the Axolotl 1M 5K 10K 13.1 26.2

 Sun, 08 Mar at 01:00 pm Boulder USD 4 to 42

Harvest Moon Long Course Triathlon

 Sun, 31 May at 07:15 am Boulder Reservoir

Luck of the Irish 5K

 Tue, 17 Mar at 01:00 pm Boulder USD 4 to 42

2026 Day of the Dead 1M 5K 10K 13.1 26.2

 Sat, 14 Mar at 01:00 pm Boulder USD 4 to 42

2026 The Truth is Out There 1M, 5K, 10K, 13.1, 26.2

 Fri, 20 Mar at 01:00 pm Boulder USD 4 to 42

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

 Sun, 01 Feb at 01:00 pm Boulder USD 4 to 42

Mother's Day 1M 5K 10K 13.1 26.2

 Sun, 10 May at 01:00 pm Boulder USD 4 to 42