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


Sat Jan 8	All-Out Polar Prowl Half Marathon 10K & 5K	Arvada CO
Sun Jan 16	Arctic Prairie Dog Half Marathon 10K & 5K	Louisville CO

February 2022


Sat Feb 26	All-Out Mardi Crawl Half Marathon 10K & 5K	Arvada CO

March 2022


Sun Mar 20	All-Out Spring Fever Half Marathon 10K & 5K	Golden CO

April 2022


Sat Apr 2	Runs with Scissors Marathon Half Marathon & 50K	Brighton CO
Sun Apr 10	Spring Fling Prairie Dog Half Marathon 10K & 5K	Arvada CO
Sat Apr 16	All-Out Beat the Heat Marathon Half Marathon 10K & 5K	Westminster CO

May 2022


Sat May 7	Carbon Valley Half Marathon & 5K	Firestone CO
Sat May 14	Mine Shaft Half Marathon & Endure 12-Hour & 24-Hour Challenges	Divide CO
Sat May 14	NOCO Half Marathon	Loveland CO
Sat May 14	Valkyrie Trail Race Marathon Half Marathon 50K & 4-Mile	Colorado Springs CO

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


Sun Aug 8	Emerald Mountain Epic Marathon & Half Marathon	Steamboat Springs CO
Sat Aug 14	Boulder Rez Marathon 3/4 Marathon Half Marathon & 10K	Boulder CO
Sat Aug 14	Georgetown to Idaho Springs Half Marathon	Georgetown CO
Sat Aug 14	Run the Rockies Trail Half Marathon & 10K	Frisco CO
Sat Aug 21	All-Out Runapalooza Half Marathon 10K & 5K	Arvada CO
Sat Aug 21	Mount Sneffels Marathon & Half Marathon	Ouray CO
Sun Aug 22	Erie Half Marathon & 5K	Erie CO
Sat Aug 28	Louisville Trail Race Half Marathon 10K & 5K	Louisville CO
Sat Aug 28	Staunton Rocks! Marathon & Half Marathon	Pine CO
Sat Aug 28	Thirsty 13 Half Marathon	Durango CO

September 2021


Sun Sep 5	Breck Crest Mountain Marathon Half Marathon Ultra & 10K	Breckenridge CO
Mon Sep 6	Labor Day Half Marathon	Parker CO
Sat Sep 11	Black Squirrel Half Marathon	Fort Collins CO
Sat Sep 11	Ned*Ned Half Marathon 10K & 5K	Nederland CO
Mon Sep 13	Center of the Nation Marathon Half Marathon 10K & 5K – Day 1	Sterling CO
Sat Sep 18	All-Out Fall Fest Marathon Half Marathon 10K & 5K	Westminster CO
Sat Sep 18	Golden Leaf Half Marathon	Aspen CO
Sat Sep 18	Mountain Rats Marathon Half Marathon & 55K	Eagle CO
Sat Sep 18	Run the Rockies Road Half Marathon & 10K	Frisco CO
Sun Sep 19	Equinox Marathon Half Marathon & 5-Mile	Fort Collins CO
Sun Sep 19	Hoof It 4 Harlie Half Marathon 10K & 5K	Rye CO
Sun Sep 19	Snow Mountain Ranch Trail Running Festival	Granby CO
Sun Sep 19	Spanish Peaks Half Marathon	La Veta CO
Sat Sep 25	Beulah Challenge Half Marathon 10K & 5K	Beulah CO
Sat Sep 25	Pioneer Prairie Dog Half Marathon 10K & 5K	Westminster CO
Sun Sep 26	Adams Half Marathon & 5K	Brighton CO
Sun Sep 26	Bear Chase Trail Half Marathon & 10K	Lakewood CO

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