2024-2025 Colorado Half Marathons Race Calendar

Colorado Half Marathons by Date

Browse all Colorado Half Marathon 2024 and 2025 by month and by city below.

For each race, you’ll find the history of the half marathon and the course, the most recent year’s course maps, elevation profiles, runner reviews, pricing, and how to sign up. When you view a race, you might also find contact info if you’re having problems with your registration or need to contact the race directors.

We dedicated dozens of hours every month searching for races to include in the Colorado Half Marathons calendar.

If you happen to see any half marathon not included, contact us at info@halfmarathons.net to submit your race.

Check beneath the Colorado half marathon calendar for answers to frequently asked questions.

Upcoming 2024 Colorado Half Marathons

April 2024

Sun Apr 7 Three Creeks Half Marathon Denver CO
Sat Apr 13 All-Out Beat the Heat Marathon Half Marathon 10K & 5K Westminster CO
Sat Apr 13 Boulder Rez Half 10k & 5k Boulder CO
Sun Apr 14 Desert RATS Trail Running Festival Half Marathon & 10k Fruita CO
Sun Apr 14 Horsetooth Half Marathon Fort Collins CO
Sun Apr 14 Platte River Half Marathon & Relay Littleton CO
Sun Apr 14 Spring Fling Prairie Dog Half Marathon 10K & 5K Arvada CO
Sat Apr 20 Time Travel Half Marathon 10k & 5k Westminster CO
Sun Apr 21 Time Travel Half Marathon 10k & 5k Colorado Springs CO
Sat Apr 27 NOCO Half Marathon & 10k Loveland CO
Sat Apr 27 Runs with Scissors Races 50k Marathon & Half Marathon Brighton CO

May 2024

Sun May 5 Colorado Marathon Half Marathon 10K & 5K Fort Collins CO
Sat May 11 Carbon Valley Half Marathon & 5k Firestone CO
Sat May 11 Valkyrie Trail Race Half Marathon Colorado Springs CO
Sat May 11 Vallecito Lake Heavy Half Bayfield CO
Sun May 12 Fruita Trail Half Fruita CO
Sat May 18 Mine Shaft Half Marathon & Endure 12-Hour & 24-Hour Challenges Divide CO
Sun May 19 Denver Colfax Marathon Half Marathon 10M & Relay Denver CO
Sun May 19 Ram Party Marathon Half Marathon 9M & 5k Colorado Springs CO
Sun May 26 Spirit Trail Run Marathon Half Marathon & 8k Buena Vista CO
Boulderthon in Boulder Colorado Half Marathon 2024

June 2024

Sat Jun 1 Mountain Ridge Trail Race 22M Half Marathon & 10k Highlands Ranch CO
Sat Jun 1 Revel Rockies Marathon & Half Marathon Evergreen CO
Sun Jun 2 Colorado 13er Half Marathon 10k & 5k Louisville CO
Sun Jun 2 Steamboat Marathon Half Marathon & 10K Steamboat Springs CO
Sat Jun 8 All-Out Summer Breeze Half Marathon 10k 5k & 1M Arvada CO
Sun Jun 16 Estes Park Marathon & Half Marathon Estes Park CO
Sat Jun 22 Slacker Half Marathon & 4-Mile Georgetown CO

July 2024

Thu Jul 4 July 4th ROCK-IT Run Half Marathon & 5k Castle Rock CO
Thu Jul 4 Longmont Half Marathon & 5K Longmont CO
Sat Jul 13 All-Out Dog Days Half Marathon 10K & 5K Westminster CO
Sat Jul 13 Aspen Valley Marathon Half Marathon & 5k Aspen CO
Sat Jul 20 Prairie Dog Half Marathon 10K & 5K Castle Rock CO

August 2024

Sat Aug 3 All-Out Runapalooza Half Marathon 10K & 5K Arvada CO
Sat Aug 3 Boulder Rez Marathon & Half Marathon Boulder CO
Sat Aug 3 Rocky Mountain Half Marathon Estes Park CO
Sun Aug 4 Emerald Mountain Epic Marathon & Half Marathon Steamboat Springs CO
Sat Aug 10 Georgetown to Idaho Springs Half Marathon Georgetown CO
Sat Aug 10 Turkey Springs Showdown Trail Races Half Marathon & 10k Pagosa Springs CO
Sat Aug 17 Mount Sneffels Marathon & Half Marathon Ouray CO
Sun Aug 18 Erie Half & 5k Erie CO
Sat Aug 24 Byers Peak Stampede Half Marathon & 5k Winter Park CO
Sat Aug 24 Hometown Half Marathon 10k & 5k Colorado Springs CO
Sat Aug 24 Staunton Rocks! Marathon & Half Pine CO
Sat Aug 24 Thirsty 13 Half Marathon Durango CO
Sat Aug 24 Westminster Trail Race Half Marathon 10k & 5k Westminster CO
Sun Aug 25 Hometown Half Marathon 10k & 5k – Denver Westminster CO

September 2024

Mon Sep 2 Labor Day Half Marathon Parker CO
Sat Sep 7 Black Squirrel Half Marathon Bellvue CO
Sat Sep 14 All-Out Fall Fest Marathon Half Marathon 10K & 5K Westminster CO
Sun Sep 15 Nun Run Half Marathon 10k & 5k Centennial CO
Sat Sep 21 Autumn Color Run Half Marathon 10k 5k & 1M Buena Vista CO
Sat Sep 21 John Wayne Grit Series – Ridgway Half Marathon & 5k Ridgway CO
Sat Sep 21 Snow Mountain Ranch Trail Festival Half Marathon Granby CO
Sun Sep 22 Boulderthon: Downtown Boulder Marathon Half Marathon & 5k Boulder CO
Sun Sep 22 Fall Equinox Marathon Half Marathon & 5M Fort Collins CO
Sat Sep 28 Colorado Springs Marathon Half Marathon & 5k Colorado Springs CO
Sat Sep 28 Louisville Trail Race Half Marathon 10k & 5k Louisville CO
Sat Sep 28 Pioneer Prairie Dog Half Marathon 10K & 5K Westminster CO
Sat Sep 28 The Rad Dirt Fest 50k & Half Marathon Trinidad CO
Sun Sep 29 Red Feather Trail Jamboree 50k & Half Marathon Red Feather Lakes CO
Mon Sep 30 Center of the Nation Series – Day 1 Marathon & Half Marathon Sterling CO
TBD Sep Sloan's Lake Search Party Marathon & Half Marathon Hourly Loop Race Denver CO
TBD Sep Breck Crest Mountain Marathon Half Marathon & 10k Breckenridge CO
TBD Sep Calarat Challenge Trail Running Festival Half Marathon 10k & 5k Jamestown CO
TBD Sep Black Squirrel Half Marathon Fort Collins CO
TBD Sep Ned Ned Run Half Marathon 10k & 5k Nederland CO
TBD Sep Trail Sisters Women's Half Marathon Buena Vista CO
TBD Sep Mountain RATS 55k Marathon & Half Marathon Eagle CO
TBD Sep Run the Rockies Half Marathon & 10k Frisco CO
TBD Sep Adams Half & 5k Brighton CO
TBD Sep Beulah Challenge Half Marathon 10k & 5k Beulah CO
TBD Sep Golden Leaf Half Marathon Aspen CO
TBD Sep Bear Chase Race Half Marathon & 10k Lakewood CO
TBD Sep Sunlight Showdown Half Marathon Glenwood Springs CO
TBD Sep Deep Creek Trail Half Marathon Telluride CO

October 2024

November 2024

December 2024

TBD Dec 2024 All-Out Fa La La Half Marathon 10K & 5K Westminster CO
TBD Dec 2024 Colorado Cold Rush 50k & Half Marathon Colorado Springs CO
TBD Dec 2024 Rock Canyon Half Marathon Pueblo CO
TBD Dec 2024 Four Corners Quad Keyah Marathon Half Marathon & 5k Four Corners Monument CO

January 2025

February 2025

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

March 2025

Fall Color Dallas Divide in Colorado; home to Colorado half marathons

Frequently Asked Questions About Colorado Half Marathons

What are the most popular Colorado half marathons?

The four most popular Colorado half marathons are the Denver Colfax Half Marathon, the REVEL Rockies Half Marathon, the Horsetooth Half Marathon, and Boulderthon.

What’s the best half marathons in Colorado for beginners in 2024?

We have three picks for the best beginner Colorado half marathons. The first is the Slacker Half Marathon for it’s fun fast downhill course. Secondly, Boulderthon, for it’s scenic course, huge crowds, and amazing production quality. And finally, the Denver Colfax Half Marathon for it’s notable and exciting course and race experience.

What’s the best month to run a half marathon in Colorado?

September and October are the most popular months to run Colorado half marathons.

What are the most popular cities to run Colorado half marathons?

Colorado Springs, Boulder, and Denver are the most popular cities to run a Colorado half marathon in.


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