Colorado Race Calendar

Colorado Half Marathons by Date • By City

Browse all 2019-2020 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 2020


Sat Jan 11	All-Out Polar Prowl Half Marathon 10K & 5K	Arvada CO
Sun Jan 19	Prairie Dog Half Marathon 10K & 5K	Louisville CO

February 2020


Sat Feb 22	All-Out Mardi Crawl Half Marathon 10K & 5K	Lakewood CO
Sun Feb 23	Pueblo Marathon & Half Marathon	Pueblo CO

March 2020


Sun Mar 22	All-Out Spring Fever Half Marathon 10K & 5K	Golden CO
Sun Mar 29	Dust Bowl Series Marathon Half Marathon 50K 10K & 5K – Day 5	Lamar CO

April 2019


Sat Apr 6	Three Creeks Half Marathon	Denver CO
Sat Apr 13	All-Out Beat the Heat Marathon Half Marathon 10K & 5K	Westminster CO
Sun Apr 14	Desert RATS Trail Running Festival Half Marathon	Fruita CO
Sun Apr 14	Horsetooth Half Marathon	Fort Collins CO
Sun Apr 14	Platte River Half Marathon & Relay	Littleton CO
Sun Apr 14	Prairie Dog Half Marathon 10K & 5K	Arvada CO
Sat Apr 20	Hoppin' Half Marathon 10K & 5K	Denver CO
Sat Apr 27	Runs with Scissors Marathon Half Marathon & 50K	Brighton CO
Sat Apr 27	Westminster Trail Half Marathon 10K & 5K	Westminster CO

May 2019


Sat May 4	Grand Valley Marathon Half Marathon 10K & 5K	Palisade CO
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	Mine Shaft Half Marathon & Tommyknocker Ultras	Golden CO
Sat May 11	Rabbit Valley Half Marathon	Fruita CO
Sun May 19	Colfax Marathon Half Marathon & Urban 10-Miler	Denver CO
Sun May 19	NORAD Trail Race Marathon Half Marathon & 4-Mile	Colorado Springs CO

June 2019


Sat Jun 1	Barr Creek Half Marathon & 10K	Brighton CO
Sat Jun 1	Bergen Peak Half Marathon	Evergreen CO
Sat Jun 1	Run the Rockies Half Marathon & 10K	Frisco CO
Sat Jun 1	Runoff Runoff Marathon Half Marathon & 6K	Creede CO
Sun Jun 2	Boulder Rez Half Marathon 10K & 5K	Boulder CO
Sun Jun 2	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	Basalt Half Marathon	Basalt CO
Sat Jun 8	South Park Trail Marathon & Half Marathon	Fairplay CO
Sat Jun 8	Steamworks Half Marathon	Durango CO
Sat Jun 15	Eagle Half Marathon & 10K	Eagle CO
Sun Jun 16	Estes Park Marathon Half Marathon 10K & 5K	Estes Park CO
Sun Jun 16	Father's Day Half Marathon 10M 10K & 5K	Denver CO
Sat Jun 22	All-Out Summer Breeze Half Marathon 10K & 5K	Arvada CO
Sat Jun 22	Mancos Cowboy Half Marathon & 5K	Mancos CO
Sat Jun 22	Mountain Ridge Trail Half Marathon & 10K	Highlands Ranch CO
Sat Jun 22	Park to Art Run Half Marathon 10K & 5K	Meeker CO
Sat Jun 22	Slacker Half Marathon 4-Mile & Relay	Georgetown CO
Sun Jun 30	Mountain Madness Half Marathon & 10K	Steamboat Springs CO

July 2019



Thu Jul 4	Longmont Half Marathon & 5K	Longmont CO
Sat Jul 13	Aspen Valley Marathon Half Marathon & 5K	Aspen CO
Sat Jul 13	Sand Creek Half Marathon 10K & 5K	Denver CO
Sun Jul 14	Summer Roundup Half Marathon & 10K	Colorado Springs CO
Sat Jul 20	All-Out Dog Days Half Marathon 10K & 5K	Westminster CO
Sat Jul 20	Camp Hale Half Marathon & 5K	Red Cliff CO
Sat Jul 20	Kickers for Kids Fun Run	Palmer Lake CO
Sat Jul 20	Prairie Dog Half Marathon & 10K	Castle Rock CO
Sun Jul 21	Blackhawk Trail Half Marathon & 10K	Golden CO
Sat Jul 27	Fort Collins Human Race Half Marathon 10K & 5K	Fort Collins CO
Sat Jul 27	Living Journeys Half Marathon	Crested Butte CO
Sat Jul 27	Sunlight Sunny Half Marathon	Glenwood Springs CO

August 2019


Sat Aug 3	Visit Estes Park Half of the Rockies	Estes Park CO
Sat Aug 3	Winter Park Half Marathon & 5K	Winter Park CO
Sun Aug 4	Beaver Creek Half Marathon 10K & 5K	Beaver Creek CO
Sat Aug 10	Run the Rockies Trail Half Marathon & 10K	Frisco CO
Sat Aug 10	Georgetown to Idaho Springs Half Marathon	Georgetown CO
Sun Aug 11	Steamboat Stinger Marathon & Half Marathon	Steamboat Springs CO
Sat Aug 17	Mount Sneffels Marathon & Half Marathon	Ouray CO
Sun Aug 18	Dog Days of Summer Half Marathon 10M 10K 5K & 1M	Denver CO
Mon Aug 19	Mainly Marathons Center of the Nation Series – Day 1	Sterling CO
Sat Aug 24	All-Out Runapalooza Half Marathon 10K & 5K	Arvada CO
Sat Aug 24	Pikes Peak Ascent Half Marathon	Manitou Springs CO
Sat Aug 24	Thirsty 13 Half Marathon	Durango CO
Sun Aug 25	Erie Half Marathon & 5K	Erie CO
Sun Aug 25	Roger's Grove Half Marathon & 10K	Longmont CO
Sat Aug 31	Point Alta Vista Trail Half Marathon	Canon City CO

September 2019


Sun Sep 1	Breck Crest Mountain Marathon Half Marathon & 10K	Breckenridge CO
Sun Sep 1	Estes Epic Half Marathon & 55K	Estes Park CO
Mon Sep 2	Labor Day Half Marathon 10K & 5K	Parker CO
Sat Sep 7	American Heroes Run Marathon Half Marathon Ultra & 5K	Longmont CO
Sat Sep 7	Black Squirrel Half Marathon	Fort Collins CO
Sat Sep 7	Boyd Lake Bash Multisport Festival	Loveland CO
Sat Sep 7	Mountain Rats Marathon Half Marathon & 50K	Eagle CO
Sat Sep 7	Ned*Ned Half Marathon 10K & 5K	Nederland CO
Sat Sep 7	Palmer Lake Half Marathon & 10K	Monument CO
Sun Sep 8	Boulder Rez Marathon 3/4 Marathon Half Marathon & 10K	Boulder CO
Sat Sep 14	Arvada Harvest Half Marathon 10K & 5K	Arvada CO
Sat Sep 14	Breckenridge Road Marathon Half Marathon & 10K	Breckenridge CO
Sat Sep 21	All-Out Fallfest Marathon Half Marathon 10K 5K & 1-Mile	Westminster CO
Sat Sep 21	Autumn Color Run Half Marathon 10K 5K & Fun Run	Buena Vista CO
Sat Sep 21	Dam U Half Marathon 10K & 5K	Aurora CO
Sun Sep 22	Equinox Half Marathon & 5-Mile	Fort Collins CO
Sun Sep 22	Snow Mountain Ranch Trail Running Festival	Granby CO
Sat Sep 28	Beulah Challenge Half Marathon 10K & 5K	Beulah CO
Sat Sep 28	Boulder Backroads Half Marathon & 10K	Boulder CO
Sat Sep 28	Colorado Springs Marathon Half Marathon 5K & Kids K	Colorado Springs CO
Sat Sep 28	Golden Leaf Half Marathon	Aspen CO
Sat Sep 28	Prairie Dog Half Marathon 10K & 5K	Westminster CO

October 2019


Sat Oct 5	Castle Rock Trail Festival Marathon Half Marathon 50K 10K & 5K	Castle Rock CO
Sun Oct 6	Louisville Trail Half Marathon 10K & 5K	Louisville CO
Sun Oct 6	Rim to Rim Royal Gorge Half Marathon	Cañon City CO
Sun Oct 13	Broomfield Trails Marathon Half Marathon 10K & 5K	Broomfield CO
Sun Oct 20	Rock 'n' Roll Denver Half Marathon & 10K	Denver CO
Sun Oct 27	All-Out Kooky-Spooky Half Marathon 10K & 5K	Golden CO
Sun Oct 27	Westy Half Marathon & 5K	Westminster CO

November 2019


Mon Nov 11	Southwest Series Marathon Half Marathon 50K 10K & 5K – Day 2	Durango CO

December 2019


Sat Dec 7	All-Out Fa La La Half Marathon 10K & 5K	Westminster CO
Sat Dec 7	Four Corners Quad Keyah Half Marathon Series – Colorado	Four Corners Monument CO
Sun Dec 8	Rock Canyon Half Marathon	Pueblo CO