Half marathons in Colorado
95 upcoming half marathons in Colorado, with dates and field depth before you enter.
October 2026
- Sat, Oct 31HRCA Backcountry Wilderness Half MarathonHighlands RanchHalf marathon
- Sat, Oct 31Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sat, Oct 31PB&J Fuel Run 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sat, Oct 31Spooky Sprint - Colorado SpringsColorado Springs5K10KHalf marathon
November 2026
- Sun, Nov 1Rim Rock Marathon and Half MarathonFruitaHalf marathon
- Sun, Nov 1All-Out Kooky-SpookyGolden5K10KHalf marathon
- Sat, Nov 7Turkey Trails- DenverLittleton5K10KHalf marathon
- Sun, Nov 8Turkey Trails - Colorado SpringsColorado Springs5K10KHalf marathon
- Sat, Nov 14Run for Mental Health 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sat, Nov 14Veterans Day Freedom Run 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sat, Nov 14Salute to Veterans 5K/10K/Half Marathon - DenverAurora5K10KHalf marathon
- Sun, Nov 15Salute to Veterans 5K/10K/Half Marathon - Colorado SpringsColorado Springs5K10KHalf marathon
- Sat, Nov 21TURKEY TREK (13.1, 10k, 5k & 2k)Arvada5K10KHalf marathon Local
- Sat, Nov 28Coffee Lovers Run 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sat, Nov 28Thanksgiving Gobble Trot Run 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
December 2026
- Sat, Dec 5All-Out Fa La LaWestminster5K10KHalf marathon Competitive
- Sun, Dec 6Rock Canyon Half MarathonPuebloHalf marathon
- Sat, Dec 12Run for Breast Cancer 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sat, Dec 12Sunrise Marathon 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sat, Dec 26A Merry Christmas Run 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sat, Dec 26New Year's Run 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
January 2027
- Sat, Jan 9All-Out Polar ProwlArvada5K10KHalf marathon Competitive
- Sat, Jan 16MLK Jr. Freedom Run 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sat, Jan 16Sunrise Marathon 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sat, Jan 23Chilly Willy 5K/10K/Half Marathon - Colorado SpringsColorado Springs5K10KHalf marathon Local
- Sat, Jan 30Time Travel Half MarathonWestminsterHalf marathon
- Sat, Jan 30Coffee Lovers Run DENVER/AURORACentennial5K10KHalf marathon
- Sat, Jan 30Run for Donut DENVER/AURORACentennial5K10KHalf marathon
- Sat, Jan 30Time Travel Half-Marathon/5K/10K - DenverWestminster5K10KHalf marathon Local
- Sun, Jan 31Time Travel Half-Marathon/5K/10K - Colorado SpringsColorado Springs5K10KHalf marathon Competitive
February 2027
- Sat, Feb 6All-Out Mardi CrawlArvada5K10KHalf marathon Competitive
- Sun, Feb 7Stories Trail RunsColorado Springs10KHalf marathon
- Sun, Feb 7Old Man Winter Bike Rally & RunLyons5K10KHalf marathon Competitive
- Sat, Feb 13Run for Chocolate 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sat, Feb 13Valentine's Day Run 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sun, Feb 14Ralston Creek Half Marathon & 5kArvada5KHalf marathon
- Sun, Feb 14The Toyota Super Half Marathon™& Game Day 5K™Colorado Springs5KHalf marathon
- Sat, Feb 27Run For Mental Health DENVER/AURORACentennial5K10KHalf marathon
- Sat, Feb 27Run Together Against Breast Cancer DENVER/AURORACentennial5K10KHalf marathon
March 2027
- Sat, Mar 6Time to Paddy 5K/10K & Lucky 13.1 13.1 - DenverDenver5K10KHalf marathon Local
- Sun, Mar 7Time to Paddy 5K/10K & Lucky 13.1 - Colorado SpringsColorado Springs5K10KHalf marathon Local
- Sat, Mar 1322nd Annual Run Through Time Trail Marathon and Half MarathonSalidaHalf marathonMarathon
- Sun, Mar 14Lucky Brew Race 5K, 10K, 15k & Half MarathonSeverance5K10KHalf marathon Very competitive
- Sat, Mar 20St. Paddy's Day Lucky Run 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sat, Mar 20Sunrise Marathon 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sun, Mar 21All-Out Spring FeverGolden5K10KHalf marathon Competitive
- Sun, Mar 21Spring EquinoxWellington5KHalf marathon Very competitive
- Sat, Mar 27Always Hope Easter Run DENVER/AURORACentennial5K10KHalf marathon
- Sat, Mar 27SuperHeroes Run DENVER/AURORACentennial5K10KHalf marathon
April 2027
- Sun, Apr 4Three Creeks Half MarathonEnglewoodHalf marathon
- Sat, Apr 10Run for PB&J 5k/10k/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sat, Apr 10Sloth Run 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sat, Apr 10Run Through The Decades 6K/7K/8K/Half - Colorado SpringsColorado SpringsHalf marathon
- Sun, Apr 11Platte River Half-Marathon, Relay & 5kLittleton5KHalf marathon Competitive
- Sun, Apr 11Spring Fling Prairie Dog Half, 10k, & 5kArvada5K10KHalf marathon Local
- Sun, Apr 18Horsetooth Half Marathon - Presented by Fort Collins ConnexionFort CollinsHalf marathon Local
- Sat, Apr 24Coffee Lovers Run DENVER/AURORACentennial5K10KHalf marathon
- Sat, Apr 24Run for Donut DENVER/AURORACentennial5K10KHalf marathon
- Sat, Apr 24DoNot Stop Half Marathon/5K/10K - Colorado SpringsColorado Springs5K10KHalf marathon
- Sat, Apr 24All-Out Beat the HeatWestminster5K10KHalf marathon Local
- Sat, Apr 24Bigfoot Half MarathonEstes Park5KHalf marathon
- Sun, Apr 25DoNot Stop Half Marathon/5K/10K - DenverDenver5K10KHalf marathon
May 2027
- Sun, May 2The Colorado MarathonFort Collins5K10KHalf marathonMarathon Local
- Sun, May 2Longmont Half & 5k (LM Half)Longmont5KHalf marathon Local
- Sat, May 8Hometown Half Marathon/5K/10K - Colorado SpringsColorado Springs5K10KHalf marathon Local
- Sat, May 8Run for Chocolate 5k/10k/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sun, May 9Hometown Half Marathon/5K/10K - DenverDenver5K10KHalf marathon Local
- Sat, May 15Endure Trail RunsDivide10KHalf marathonMarathon Very competitive
- Sat, May 29SuperHeroes Run DENVER/AURORACentennial5K10KHalf marathon
June 2027
- Sun, Jun 6Colorado 13er (Half Marathon/10k/5k)Louisville5K10KHalf marathon
- Sun, Jun 6The Steamboat MarathonSteamboat Springs10KHalf marathonMarathon
- Sat, Jun 12All-Out Summer BreezeArvada5K10KHalf marathon Local
- Sat, Jun 19Run Juneteenth Day 5K/10K/13.1 DENVER/AURORACentennial5K10KHalf marathon
- Sat, Jun 19Red, White and Brew 5k, 10k & Half MarathonWindsor5K10KHalf marathon Local
- Sat, Jun 26Slacker Half Marathon-Relay-4-Mile RacesGeorgetownHalf marathon Local
July 2027
- Sat, Jul 10All-Out Dog DaysWestminster5K10KHalf marathon Local
- Sat, Jul 17Heatwave Half Marathon/5K/10K - DenverDenver5K10KHalf marathon Local
- Sat, Jul 17Summer Splash Prairie Dog Half, 10k, & 5kCastle Rock5K10KHalf marathon Local
- Sun, Jul 18Heatwave Half Marathon/5K/10K - Colorado SpringsColorado Springs5K10KHalf marathon Local
- Sat, Jul 31Popsicle 5K/10K/Half - Colorado SpringsColorado Springs5K10KHalf marathon
August 2027
- Sun, Aug 1Bound for Boston Marathon & Half Marathon - DenverDenverHalf marathonMarathon Competitive
- Sat, Aug 7All-Out RunapaloozaArvada5K10KHalf marathon Competitive
- Sat, Aug 7Sheep Mountain Trail RunsFairplayHalf marathon
- Sun, Aug 15Erie Half & 5kErie5KHalf marathon Local
- Sat, Aug 21Byers Peak Stampede Half Marathon & 5K RunFraser5KHalf marathon
- Sun, Aug 22Pioneer Prairie Dog Half, 10k & 5kWestminster5K10KHalf marathon Local
- Sat, Aug 28TBK Bank Thirsty 13 Half MarathonDurangoHalf marathon Local
September 2027
- Mon, Sep 6Labor Day Half MarathonParker5K10KHalf marathon Competitive
- Sat, Sep 11Golden Harvest Half Marathon & 5K/10K - DenverDenver5K10KHalf marathon
- Sun, Sep 12Golden Harvest Half Marathon & 5K/10K - Colorado SpringsColorado Springs5K10KHalf marathon
- Sat, Sep 18All-Out Fall FestWestminster5K10KHalf marathon Local
- Sat, Sep 18Autumn RunBuena Vista5K10KHalf marathon