Colorado Race Calendar

Colorado Half Marathons by Date • By City

Browse all 2021-2022 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 2022

February 2022

March 2022

April 2022

May 2022

June 2021

Sat Jun 5 Bergen Peak Half Marathon Evergreen CO
Sat Jun 5 Revel Rockies Marathon & Half Marathon Evergreen CO
Sun Jun 6 Boulder Rez Half Marathon 10K & 5K Boulder CO
Sun Jun 6 Colorado 13er Half Marathon 10K & 5K Louisville CO
Sun Jun 6 Steamboat Marathon Half Marathon & 10K Steamboat Springs CO
Sat Jun 12 South Park Trail Marathon & Half Marathon Fairplay CO
Sat Jun 12 Steamworks Half Marathon Durango CO
Sat Jun 19 Mountain Ridge Half Marathon & 10K Highlands Ranch CO
Sun Jun 20 Estes Park Marathon Half Marathon 10K & 5K Estes Park CO
Sat Jun 26 All-Out Summer Breeze Half Marathon 10K 5K & 1-Mile Arvada CO
Sat Jun 26 Slacker Half Marathon 4-Mile & Relay Georgetown CO

July 2021

Sun Jul 4 Longmont Half Marathon & 5K Longmont CO
Sat Jul 17 All-Out Dog Days Half Marathon 10K & 5K Westminster CO
Sat Jul 17 Prairie Dog Half Marathon 10K & 5K Castle Rock CO
Sun Jul 18 Black Hawk Half Marathon & 10K Golden CO
Sun Jul 18 Sunlight Showdown Half Marathon Glenwood Springs CO
Sat Jul 31 Rocky Mountain Half Marathon Estes Park CO
Sat Jul 31 Winter Park Half Marathon & 5K Winter Park CO

August 2021

September 2021

October 2021

Sat Oct 2 Castle Rock Trail Festival Castle Rock CO
Sat Oct 2 Colorado Springs Marathon Half Marathon & 5K Colorado Springs CO
Sat Oct 2 Deep Creek Trail Half Marathon Telluride CO
Sat Oct 2 Glenwood Canyon Shuffle Half Marathon & 5K Glenwood Springs CO
Sun Oct 3 Long View Marathon & Half Marathon Fort Collins CO
Sun Oct 3 'Rad Dirt Fest Half Marathon & Ultras Trinidad CO
Sun Oct 3 Rim to Royal Gorge Half Marathon Cañon City CO
Sat Oct 9 Breckenridge Marathon Half Marathon & 10K Breckenridge CO
Sat Oct 9 Grand Valley Half Marathon 10K & 5K Palisade CO
Sun Oct 10 Boulderthon Marathon & Half Marathon Boulder CO
Sun Oct 10 Windsor Marathon Half Marathon & Heavy 10K Windsor CO
Sat Oct 16 Aspen Valley Marathon Half Marathon & 5K Aspen CO
Sat Oct 16 Colfax Marathon Half Marathon 10-Mile & Relay Denver CO
Sat Oct 16 Mancos Cowboy Half Marathon & 5K Mancos CO
Sun Oct 24 Colorado Marathon Half Marathon 10K & 5K Fort Collins CO
Sun Oct 24 Westy Half & 5K Westminster CO
Sun Oct 31 All-Out Kooky-Spooky Half Marathon 10K & 5K Golden CO

November 2021

Sat Nov 6 Backcountry Wilderness Half Marathon Highlands Ranch CO
Sat Nov 6 Rim Rock Marathon & Half Marathon Grand Junction CO
Mon Nov 8 Southwest Series Marathon Half Marathon 10K & 5K – Day 2 Durango CO
Sun Nov 14 Horsetooth Half Marathon Fort Collins CO

December 2021

Sat Dec 4 All-Out Fa La La Half Marathon 10K & 5K Westminster CO
Sun Dec 5 Rock Canyon Half Marathon Pueblo CO