Half Marathons in Colorado

Upcoming half marathons in Colorado. Use filters to quickly find races by month, city or race type.

More races:ย USA running calendar

Date RaceDistanceLocationhf:tax:monthandyearhf:tax:cityhf:tax:typerace
04/26/2025Runs with Scissors Races13.1M, 26.2M, 50KBrighton CO04-aprilbrighton-cotrail
04/26/2025Royal Gorge Groove Trail Runs12K, 20K, 30K, 50K, 5KCaรฑon City CO04-aprilcanon-city-cotrail
04/27/2025Blue Heron Half Marathon13.1M, 5KHighlands Ranch CO04-aprilhighlands-ranch-cotrail
05/04/2025Longmont Half Marathon13.1M, 5KLongmont CO05-maylongmont-coroadrace
05/04/2025Colorado Marathon10K, 13.1M, 26.2M, 5KFort Collins CO05-mayfort-collins-coroadrace
05/10/2025Mountain Ridge Trail Race10K, 13.1M, 21M, 5KHighlands Ranch CO05-mayhighlands-ranch-cotrail
05/10/2025Carbon Valley Half Marathon13.1M, 5KFirestone CO05-mayfirestone-coroadrace
05/10/2025Valkyrie Trail Race13.1M, 26.2M, 30K, 4M, 50K, 8MColorado Springs CO05-maycolorado-springs-cotrail
05/11/2025Fruita Trail Half13.1MFruita CO05-mayfruita-cotrail
05/17/2025Endure Trail Runs10K, 12H, 13.1M, 24HDivide CO05-maydivide-cotrail
05/17/2025Ram Party15K, 24K, 50K, 55M, 60KColorado Springs CO05-maycolorado-springs-cotrail
05/17/2025Denver Colfax Marathon10M, 13.1M, 26.2MDenver CO05-maydenver-coroadrace
05/25/2025Spirit Trail Race13.1M, 26.2M, 9KBuena Vista CO05-maybuena-vista-cotrail
05/31/2025Basalt Half Marathon13.1MBasalt CO05-maybasalt-coroadrace
06/01/2025Steamboat Marathon10K, 13.1M, 26.2MSteamboat Springs CO06-junesteamboat-springs-coroadrace
06/01/2025Colorado 13er10K, 13.1M, 5KLouisville CO06-junelouisville-coroadrace
06/07/2025Steamworks Half Marathon13.1MDurango CO06-junedurango-coroadrace
06/07/2025All-Out Summer Breeze Half Marathon10K, 13.1M, 5KArvada CO06-junearvada-coroadrace
06/14/2025Estes Park Marathon and Half Marathon13.1M, 26.2M, 5MEstes Park CO06-juneestes-park-coroadrace
06/21/2025Hometown Half Marathon – Denver10K, 13.1M, 5KWestminister CO06-junewestminister-coroadrace
06/21/2025Red, White and Brew10K, 12H, 13.1M, 5KWindsor CO06-junewindsor-coroadrace
06/22/2025Hometown Half Marathon – Colorado Springs10K, 13.1M, 5KColorado Springs CO06-junecolorado-springs-coroadrace
06/28/2025Slacker Half Marathon-Relay-4-Mile Races13.1M, 4MGeorgetown CO06-junegeorgetown-coroadrace
07/04/2025ROCK-IT Run Half Marathon13.1M, 5KCastle Rock CO07-julycastle-rock-coroadrace
07/04/2025July 4th ROCK-IT Run13.1M, 1K, 5KCastle Rock CO07-julycastle-rock-coroadrace
07/12/2025All-Out Dog Days Half Marathon10K, 13.1M, 5KWestminster CO07-julywestminster-coroadrace
07/19/2025Summer Splash Prairie Dog Half10K, 13.1M, 5KCastle Rock CO07-julycastle-rock-coroadrace
07/19/2025Aspen Valley Marathon13.1M, 26.2M, 5KAspen CO07-julyaspen-cotrail
08/01/2025Rocky Mountain Half Marathon13.1M, 5KEstes Park CO08-augustestes-park-coroadrace
08/02/2025Boulder Rez Marathon10K, 13.1M, 19.7M, 26.2MBoulder CO08-augustboulder-coroadrace
08/02/2025Sheep Mountain Trail Runs13.1M, 50K, 50MFairplay CO08-augustfairplay-cotrail
08/02/2025Emerald Mountain Epic Marathon10K, 13.1M, 26.2MSteamboat Springs CO08-auguststeamboat-springs-cotrail
08/02/2025All-Out Runapalooza Half Marathon10K, 13.1M, 5KArvada CO08-augustarvada-coroadrace
08/08/2025Choice City Running Festival10K, 13.1M, 5KFort Collins CO08-augustfort-collins-coroadrace
08/09/2025Georgetown to Idaho Springs Half Marathon13.1MGeorgetown CO08-augustgeorgetown-coroadrace
08/09/2025Run the Rockies Trail Race10K, 13.1M, 5KFrisco CO08-augustfrisco-cotrail
08/09/2025Human Race Half Marathon10K, 13.1M, 1M, 5KFort Collins CO08-augustfort-collins-coroadrace
08/16/2025Mt Sneffels Marathon10K, 13.1MOuray CO08-augustouray-coroadrace
08/17/2025Erie Half13.1M, 5KErie CO08-augusterie-coroadrace
08/23/2025Byers Peak Stampede Half Marathon13.1M, 5KWinter Park CO08-augustwinter-park-coroadrace
08/23/2025TBK Bank Thirsty 13 Half Marathon13.1MDurango CO08-augustdurango-coroadrace
08/23/2025Staunton Rocks! Marathon & Half Marathon13.1M, 26.2MPine CO08-augustpine-cotrail
08/23/2025Thirsty 13 Half Marathon13.1MDurango CO08-augustdurango-coroadrace
08/23/2025Byers Peak Stampede Half Marathon13.1M, 5KWinter Park CO08-augustwinter-park-cotrail
09/01/2025Labor Day Half Marathon10K, 13.1M, 5KParker CO09-septemberparker-coroadrace
09/05/2025American Heroes Run100M, 13.1M, 24H, 26.2M, 5K, 9.11M, 9HLongmont CO09-septemberlongmont-coroadrace
09/06/2025Devil on the Divide22K, 50KEmpire CO09-septemberempire-cotrail
09/06/2025Black Squirrel Half Marathon13.1MFort Collins CO09-septemberfort-collins-cotrail
09/13/2025Snow Mountain Ranch Trail Festival10K, 13.1M, 33K, 50K, 5KGranby CO09-septembergranby-cotrail
09/13/2025Trail Sisters Women’s Half Marathon10K, 13.1MBuena Vista CO09-septemberbuena-vista-cotrail
09/13/2025All-Out Fall Fest10K, 13.1M, 5KWestminster CO09-septemberwestminster-coroadrace
09/13/2025Ned Ned Run Half Marathon10K, 13.1M, 5KNederland CO09-septembernederland-cotrail
09/13/2025Spooky Sprint – Colorado Springs10K, 13.1M, 5KColorado Springs CO09-septembercolorado-springs-coroadrace
09/14/2025Nun Run13.1M, 1M, 5KCentennial CO09-septembercentennial-coroadrace
09/14/2025Fall Equinox13.1M, 26.2M, 5MFort Collins CO09-septemberfort-collins-coroadrace
09/14/2025Spooky Sprint – Denver10K, 13.1M, 5KWestminster CO09-septemberwestminster-coroadrace
09/20/2025Pikes Peak Ascent and Marathon13.32MManitou Springs CO09-septembermanitou-springs-cotrail
09/20/2025Ouray Mountain Trail Run13MOuray CO09-septemberouray-cotrail
09/20/2025Beulah Challenge and OverIt Series10K, 13.1M, 5KBeulah CO09-septemberbeulah-coroadrace
09/20/2025Autumn Run Half Marathon10K, 13.1M, 5KBuena Vista CO09-septemberbuena-vista-coroadrace
09/26/2025Red Feather Trail Jamboree13.1M, 50K, 50MRed Feather Lakes CO09-septemberred-feather-lakes-cotrail
09/27/2025Prairie Dog Half10K, 13.1M, 5KWestminster CO09-septemberwestminster-coroadrace
09/27/2025Golden Leaf Half Marathon13.1MSnowmass Village CO09-septembersnowmass-village-cotrail
09/27/2025Pioneer Prairie Dog Half10K, 13.1M, 5KWestminster CO09-septemberwestminster-coroadrace
09/28/2025Boulderthon10K, 13.1M, 26.2M, 5KBoulder CO09-septemberboulder-coroadrace
10/04/2025Bear Chase Race – Half Marathon100K, 10K, 13.1M, 50K, 50MLakewood CO10-octoberlakewood-cotrail
10/04/2025Rim to Rim Royal Gorge Races13.1M, 5K, 8MCaรฑon City CO10-octobercanon-city-cotrail
10/04/2025Colorado Springs Marathon13.1M, 26.2M, 5KColorado Springs CO10-octobercolorado-springs-coroadrace
10/05/2025Windsor Marathon10K, 13.1M, 26.2M, 5KWindsor CO10-octoberwindsor-coroadrace
10/11/2025Long View Marathon13.1M, 26.2M, 5KFort Collins CO10-octoberfort-collins-coroadrace
10/11/2025Breckenridge Road Marathon10K, 13.1M, 26.2MBreckenridge CO10-octoberbreckenridge-coroadrace
10/12/2025Westy Half & 5K13.1M, 5KWestminster CO10-octoberwestminster-coroadrace
10/18/2025Blue Sky Trail Marathon13.1M, 26.2MFort Collins CO10-octoberfort-collins-cotrail
11/02/2025All-Out Kooky-Spooky Half Marathon10K, 13.1M, 5KGolden CO11-novembergolden-coroadrace
11/08/2025HRCA Backcountry Wilderness Half Marathon13.1MLone Tree CO11-novemberlone-tree-coroadrace
11/15/2025Louisville Trail Race Half Marathon10K, 13.1M, 5KLouisville CO11-novemberlouisville-cotrail

Colorado Race Calendar

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