Colorado Race Calendar

Colorado Half Marathons by Date • By City

Browse all 2022-2023 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.

July 2022


Mon Jul 4	Live Free ROCK-IT Run Half Marathon 5k & 1k	Castle Rock CO
Mon Jul 4	Longmont Half Marathon & 5K	Longmont CO
Sat Jul 16	Aspen Valley Marathon Half Marathon & 5K	Aspen CO
Sat Jul 16	Prairie Dog Half Marathon 10K & 5K	Castle Rock CO
Sun Jul 17	Black Hawk Trail Half Marathon	Golden CO
Sat Jul 23	All-Out Dog Days Half Marathon 10K & 5K	Westminster CO
Sat Jul 23	Living Journeys Half Marathon	Crested Butte CO
Sat Jul 30	Mt. Sopris Run Off Half Marathon & 4M	Carbondale CO
Sat Jul 30	Rocky Mountain Half Marathon	Estes Park CO

August 2022


Sat Aug 6	Go Half Crazy – Denver Half Marathon 10k & 5k	Thornton CO
Sat Aug 6	Human Race Half Marathon 10k & 5k	Fort Collins CO
Sun Aug 7	Emerald Mountain Epic Marathon & Half Marathon	Steamboat Springs CO
Sun Aug 7	Go Half Crazy – Colorado Springs Half Marathon 10k & 5k	Colorado Springs CO
Sat Aug 13	Boulder Rez Marathon 19.7M Half Marathon 10k & Relay	Boulder CO
Sat Aug 13	Georgetown to Idaho Springs Half Marathon	Georgetown CO
Sat Aug 13	Run the Rockies Half Marathon & 10K	Frisco CO
Sat Aug 13	Turkey Springs Showdown Half Marathon & 10k	Pagosa Springs CO
Sat Aug 20	All-Out Runapalooza Half Marathon 10K & 5K	Arvada CO
Sat Aug 20	Arkansas Valley Fair Half Marathon	Rocky Ford CO
Sat Aug 20	Dynafit Half Marathon	Vail CO
Sat Aug 20	Mount Sneffels Marathon & Half Marathon	Ouray CO
Sun Aug 21	Erie Half Marathon & 5K	Erie CO
Sat Aug 27	Kokopelli Classic Half Marathon	Loma CO
Sat Aug 27	Louisville Trail Race Half Marathon 10K & 5K	Louisville CO
Sat Aug 27	Staunton Rocks! Marathon & Half Marathon	Pine CO
Sat Aug 27	Thirsty 13 Half Marathon	Durango CO

September 2022


Mon Sep 5	Labor Day Half Marathon	Parker CO
Sat Sep 10	Black Squirrel Half Marathon	Fort Collins CO
Sat Sep 10	Ned Ned Run Half Marathon 10k & 5k	Nederland CO
Sat Sep 10	Winter Park Half Marathon	Winter Park CO
Sat Sep 17	Red Feather Trail Jamboree 50k & Half Marathon	Red Feather Lakes CO
Sat Sep 17	All-Out Fall Fest Marathon Half Marathon 10K & 5K	Westminster CO
Sat Sep 17	Autumn Color Run Half Marathon 10k 5k & 1M	Buena Vista CO
Sat Sep 17	Beulah Challenge Half Marathon 10k & 5k	Beulah CO
Sat Sep 17	Golden Leaf Half Marathon	Aspen CO
Sat Sep 17	Mountain Rats Marathon Half Marathon & 55K	Eagle CO
Sat Sep 17	Pikes Peak Ascent Half Marathon	Manitou Springs CO
Sat Sep 17	Red Feather Trail Jamboree 50k & Half Marathon	Red Feather Lakes CO
Sat Sep 17	Run the Rockies Half Marathon & 10k	Frisco CO
Sat Sep 17	Snow Mountain Ranch Trail Running Festival	Granby CO
Sun Sep 18	Fall Equinox Marathon Half Marathon & 5M	Fort Collins CO
Sun Sep 18	Nun Run Half Marathon 5k & 1M	Littleton CO
Sun Sep 18	Spanish Peaks Half Marathon 2M & Relay	La Veta CO
Sat Sep 24	Pioneer Prairie Dog Half Marathon 10K & 5K	Westminster CO
Sun Sep 25	Bear Chase Race Half Marathon & 10k	Lakewood CO
Sun Sep 25	Sunlight Showdown Half Marathon	Glenwood Springs CO

October 2022


Sat Oct 1	Castle Rock Trail Festival 50k Half Marathon 10k & 5k	Castle Rock CO
Sat Oct 1	Colorado Springs Marathon Half Marathon & 5K	Colorado Springs CO
Sun Oct 2	Long View Marathon & Half Marathon	Fort Collins CO
Sun Oct 2	Rim to Rim Royal Gorge Races Half Marathon	Canon City CO
Mon Oct 3	Center of the Nation Series – Day 1 Marathon & Half Marathon	Sterling CO
Sat Oct 8	Deep Creek Trail Half Marathon	Telluride CO
Sat Oct 8	Rough Canyon Trail Runs 50M 50k Half Marathon 10k & 5k	Grand Junction CO
Sat Oct 8	The Rad Dirt Fest 50k & Half Marathon	Trinidad CO
Sun Oct 9	Adams Half & 5k	Brighton CO
Sun Oct 9	Boulderthon Marathon & Half Marathon	Boulder CO
Sun Oct 9	Windsor Marathon Half Marathon & Heavy 10K	Windsor CO
Sat Oct 15	Mancos Cowboy Half Marathon & 5k	Mancos CO
Sun Oct 16	Westy Half & 5k	Westminster CO
Sun Oct 30	All-Out Kooky-Spooky Half Marathon 10k 5k & 1M	Golden CO

November 2022


Sat Nov 5	Bridge Burner Ultra 50k 30k & Half Marathon	Canon City CO
Sat Nov 5	Backcountry Wilderness Half Marathon	Highlands Ranch CO
Mon Nov 7	Southwest Series Marathon Half Marathon 10K & 5K – Day 2	Durango CO

December 2022


Sat Dec 3	All-Out Fa La La Half Marathon 10K & 5K	Westminster CO
Sat Dec 3	Four Corners Quad Keyah Marathon Half Marathon 5k & 2M	Four Corners Monument CO
Sun Dec 4	Rock Canyon Half Marathon	Pueblo CO

January 2023


Sat Jan 7	All-Out Polar Prowl Half Marathon 10k & 5k	Arvada CO
Sun Jan 15	Arctic Prairie Dog Half – Westminster Half Marathon 10k & 5k	Westminster CO

February 2023


Sat Feb 4	All-Out Mardi Crawl Half Marathon 10K & 5K	Arvada CO
Sun Feb 12	Super Half Marathon & 5k	Colorado Springs CO

March 2023


Sat Mar 11	Run Through Time Marathon Half Marathon & 2M	Salida CO
Sun Mar 19	All-Out Spring Fever Half Marathon 10K & 5K	Golden CO

April 2023


Sun Apr 2	Platte River Half Marathon & Relay	Littleton CO
Sat Apr 8	Runs with Scissors Races 50k Marathon & Half Marathon	Brighton CO
Sat Apr 15	All-Out Beat the Heat Marathon Half Marathon 10K & 5K	Westminster CO
Sun Apr 16	Horsetooth Half Marathon	Fort Collins CO
Sun Apr 16	Spring Fling Prairie Dog Half Marathon 10K & 5K	Arvada CO
Sun Apr 30	Blue Heron Half and 5k	Brighton CO

May 2023


Sun May 7	Colorado Marathon Half Marathon 10K & 5K	Fort Collins CO
Sat May 13	Mine Shaft Half Marathon & Endure 12-Hour & 24-Hour Challenges	Divide CO
Sat May 20	Valkyrie Trail Race Marathon Half Marathon 50K & 4-Mile	Colorado Springs CO
Sun May 21	Denver Colfax Marathon Half Marathon 10M & Relay	Denver CO
Sun May 28	Spirit Trail Run Marathon Half Marathon & 8k	Buena Vista CO

June 2023


Sat Jun 3	Revel Rockies Marathon & Half Marathon	Evergreen CO
Sat Jun 3	South Park Trail Marathon Half Marathon & Ultra	Fairplay CO
Sun Jun 4	Steamboat Marathon Half Marathon & 10K	Steamboat Springs CO
Sun Jun 18	Estes Park Marathon & Half Marathon	Estes Park CO