Colorado Race Calendar

Colorado Half Marathons by Date • By City

Browse all 2019-2020 Colorado half marathons by month below. For each race, you’ll find course maps, elevation profiles, runner reviews, and how to sign up.

When you view a race, you’ll also find contact info if you’re having problems with your registration or need to contact the race directors.

January 2020

February 2020

March 2020

April 2020

May 2020

June 2020

July 2019

Thu Jul 4 Longmont Half Marathon & 5K Longmont CO
Sat Jul 13 Aspen Valley Marathon Half Marathon & 5K Aspen CO
Sat Jul 13 Sand Creek Half Marathon 10K & 5K Denver CO
Sun Jul 14 Summer Roundup Half Marathon & 10K Colorado Springs CO
Sat Jul 20 All-Out Dog Days Half Marathon 10K & 5K Westminster CO
Sat Jul 20 Camp Hale Half Marathon & 5K Red Cliff CO
Sat Jul 20 Kickers for Kids Fun Run Palmer Lake CO
Sat Jul 20 Prairie Dog Half Marathon & 10K Castle Rock CO
Sun Jul 21 Blackhawk Trail Half Marathon & 10K Golden CO
Sat Jul 27 Fort Collins Human Race Half Marathon 10K & 5K Fort Collins CO
Sat Jul 27 Living Journeys Half Marathon Crested Butte CO
Sat Jul 27 Sunlight Sunny Half Marathon Glenwood Springs CO

August 2019

Sat Aug 3 Visit Estes Park Half of the Rockies Estes Park CO
Sat Aug 3 Winter Park Half Marathon & 5K Winter Park CO
Sun Aug 4 Beaver Creek Half Marathon 10K & 5K Beaver Creek CO
Sat Aug 10 Run the Rockies Trail Half Marathon & 10K Frisco CO
Sat Aug 10 Georgetown to Idaho Springs Half Marathon Georgetown CO
Sun Aug 11 Steamboat Stinger Marathon & Half Marathon Steamboat Springs CO
Sat Aug 17 Mount Sneffels Marathon & Half Marathon Ouray CO
Sun Aug 18 Dog Days of Summer Half Marathon 10M 10K 5K & 1M Denver CO
Mon Aug 19 Mainly Marathons Center of the Nation Series – Day 1 Sterling CO
Sat Aug 24 All-Out Runapalooza Half Marathon 10K & 5K Arvada CO
Sat Aug 24 Pikes Peak Ascent Half Marathon Manitou Springs CO
Sat Aug 24 Thirsty 13 Half Marathon Durango CO
Sun Aug 25 Erie Half Marathon & 5K Erie CO
Sun Aug 25 Roger's Grove Half Marathon & 10K Longmont CO
Sat Aug 31 Point Alta Vista Trail Half Marathon Canon City CO

September 2019

Sun Sep 1 Breck Crest Mountain Marathon Half Marathon & 10K Breckenridge CO
Sun Sep 1 Estes Epic Half Marathon & 55K Estes Park CO
Mon Sep 2 American Discovery Trail Marathon Half Marathon & 10K Colorado Springs CO
Mon Sep 2 Labor Day Half Marathon 10K & 5K Parker CO
Sat Sep 7 American Heroes Run Marathon Half Marathon Ultra & 5K Longmont CO
Sat Sep 7 Arvada Harvest Half Marathon 10K & 5K Arvada CO
Sat Sep 7 Black Squirrel Half Marathon Fort Collins CO
Sat Sep 7 Boyd Lake Bash Multisport Festival Loveland CO
Sat Sep 7 Mountain Rats Marathon Half Marathon & 50K Eagle CO
Sat Sep 7 Ned*Ned Half Marathon 10K & 5K Nederland CO
Sat Sep 7 Palmer Lake Half Marathon & 10K Monument CO
Sun Sep 8 Boulder Rez Marathon 3/4 Marathon Half Marathon & 10K Boulder CO
Sat Sep 14 Breckenridge Road Marathon Half Marathon & 10K Breckenridge CO
Sat Sep 14 Fox Run Fun Run Marathon Half Marathon 50-Mile 10K & 5K Colorado Springs CO
Sun Sep 15 Women's Run Series Half Marathon 10K & 5K – Denver Arvada CO
Sat Sep 21 All-Out Fallfest Marathon Half Marathon 10K 5K & 1-Mile Westminster CO
Sat Sep 21 Autumn Color Run Half Marathon 10K 5K & Fun Run Buena Vista CO
Sat Sep 21 Camp 4 Coffee Cart to Cart Trail Race Crested Butte CO
Sat Sep 21 Dam U Half Marathon 10K & 5K Aurora CO
Sat Sep 21 Hoof It 4 Harlie Half Marathon Rye CO
Sun Sep 22 Equinox Half Marathon & 5-Mile Fort Collins CO
Sun Sep 22 Snow Mountain Ranch Trail Running Festival Granby CO
Sat Sep 28 Beulah Challenge Half Marathon 10K & 5K Beulah CO
Sat Sep 28 Boulder Backroads Half Marathon & 10K Boulder CO
Sat Sep 28 Colorado Springs Marathon Half Marathon 5K & Kids K Colorado Springs CO
Sat Sep 28 Golden Leaf Half Marathon Aspen CO
Sat Sep 28 Prairie Dog Half Marathon 10K & 5K Westminster CO
Sun Sep 29 Bear Chase Trail Race Half Marathon & 10K Lakewood CO

October 2019

November 2019

December 2019

Sat Dec 7 All-Out Fa La La Half Marathon 10K & 5K Westminster CO
Sat Dec 7 Four Corners Quad Keyah Half Marathon Series – Colorado Four Corners Monument CO
Sun Dec 8 Rock Canyon Half Marathon Pueblo CO