Colorado Race Calendar

Colorado Half Marathons by Date • By City

Browse all 2023-2024 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.

September 2023

Sat Sep 2 Sloan's Lake Search Party Marathon & Half Marathon Hourly Loop Race Denver CO
Sun Sep 3 Breck Crest Mountain Marathon Half Marathon & 10k Breckenridge CO
Sun Sep 3 Calarat Challenge Trail Running Festival Half Marathon 10k & 5k Jamestown CO
Mon Sep 4 Labor Day Half Marathon Parker CO
Sat Sep 9 Black Squirrel Half Marathon Fort Collins CO
Sat Sep 9 Ned Ned Run Half Marathon 10k & 5k Nederland CO
Sat Sep 9 Trail Sisters Women's Half Marathon Buena Vista CO
Sat Sep 16 All-Out Fall Fest Marathon Half Marathon 10K & 5K Westminster CO
Sat Sep 16 Autumn Color Run Half Marathon 10k 5k & 1M Buena Vista CO
Sat Sep 16 Mountain RATS 55k Marathon & Half Marathon Eagle CO
Sat Sep 16 Run the Rockies Half Marathon & 10k Frisco CO
Sun Sep 17 Adams Half & 5k Brighton CO
Sun Sep 17 Fall Equinox Marathon Half Marathon & 5M Fort Collins CO
Sun Sep 17 Nun Run Half Marathon 10k & 5k Centennial CO
Sat Sep 23 Beulah Challenge Half Marathon 10k & 5k Beulah CO
Sat Sep 23 Golden Leaf Half Marathon Aspen CO
Sat Sep 23 John Wayne Grit Series – Ridgway Half Marathon & 5k Ridgway CO
Sat Sep 23 Pioneer Prairie Dog Half Marathon 10K & 5K Westminster CO
Sat Sep 23 Snow Mountain Ranch Trail Festival Half Marathon Granby CO
Sun Sep 24 Bear Chase Race Half Marathon & 10k Lakewood CO
Sun Sep 24 Red Feather Trail Jamboree 50k & Half Marathon Red Feather Lakes CO
Sun Sep 24 Sunlight Showdown Half Marathon Glenwood Springs CO
Sat Sep 30 Colorado Springs Marathon Half Marathon & 5k Colorado Springs CO
Sat Sep 30 Deep Creek Trail Half Marathon Telluride CO
Sat Sep 30 The Rad Dirt Fest 50k & Half Marathon Trinidad CO

October 2023

November 2023

December 2023

Sat Dec 2 Colorado Cold Rush 50k & Half Marathon Colorado Springs CO
Sat Dec 2 All-Out Fa La La Half Marathon 10K & 5K Westminster CO
Sun Dec 3 Rock Canyon Half Marathon Pueblo CO
Sun Dec 10 Four Corners Quad Keyah Marathon Half Marathon & 5k Four Corners Monument CO

January 2024

February 2024

Sun Feb 11 All-Out Mardi Crawl Half Marathon 10K & 5K Arvada CO
Sun Feb 11 Super Half Marathon and Game Day 5k Colorado Springs CO
Sun Feb 18 Stories Ultra 6H Half Marathon & 10k Colorado Springs CO

March 2024

April 2024

May 2024

June 2024

July 2024

Thu Jul 4 Longmont Half Marathon & 5K Longmont CO
Sat Jul 13 All-Out Dog Days Half Marathon 10K & 5K Westminster CO
Sat Jul 20 Prairie Dog Half Marathon 10K & 5K Castle Rock CO

August 2024