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

Sun Feb 2 Super Half Marathon & 5K Colorado Springs CO
Sun Feb 9 Ralston Creek Half Marathon & 5K Arvada CO
Sat Feb 22 All-Out Mardi Crawl Half Marathon 10K & 5K Lakewood CO
Sun Feb 23 Pueblo Marathon & Half Marathon Pueblo CO

March 2020

April 2020

May 2020

June 2020

July 2020

Sat Jul 4 Longmont Half Marathon & 5K Longmont CO
Sat Jul 11 Aspen Valley Marathon Half Marathon & 5K Aspen CO
Sat Jul 11 Sand Creek Half Marathon 10K & 5K Denver CO
Sat Jul 18 All-Out Dog Days Half Marathon 10K & 5K Westminster CO
Sat Jul 18 Prairie Rock Half Marathon & 10K Castle Rock CO
Sun Jul 19 Sunlight Showdown 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