Half Marathons in Colorado
Evergreen, CO
Bergen Peak Half Marathon
Sep 14, 2024
Longmont, CO
Longmont Half & 5k
Jul 4, 2024
Glenwood Springs, CO
Sunlight Showdown
Sep 22, 2024
Denver, CO
Time to Paddy 5K/10K and Lucky 13.1
Mar 3, 2024
Three Creeks Half Marathon
Apr 7, 2024
Denver Colfax Marathon
May 19, 2024
May 18, 2024
REVEL Rockies
Jun 1, 2024
Sloan's Lake Search Party (SLSP)! Marathon Hourly Loop Race
Sep 7, 2024
Nun Run
Sep 15, 2024
Colorado Springs, CO
Evit's Hope Half
Jun 10, 2023
Time to Paddy 5K/10K and Lucky 13.1
Mar 2, 2024
Time Travel Half Marathon
Apr 21, 2024
Valkyrie Trail Race
May 11, 2024
Ram Party
May 18, 2024
May 19, 2024
Hometown Half Marathon
Aug 10, 2024
Colorado Springs Marathon
Sep 28, 2024
Spooky Sprint - Colorado Springs
Oct 6, 2024
Colorado Cold Rush
Nov 30, 2024
Super Half Marathon and Game Day 5K
Feb 9, 2025
Stories Trail Runs
Feb 15, 2025
Feb 16, 2025
Durango, CO
Steamworks Half Marathon
Jun 8, 2024
Thirsty 13 Half Marathon
Aug 24, 2024
Southwest Series - Day 2 - CO
Nov 11, 2024
Idaho Springs, CO
Georgetown to Idaho Springs Half Marathon
Aug 10, 2024
Fruita, CO
Desert RATS Trail Running Festival
Apr 13, 2024
Apr 14, 2024
Apr 12, 2024
Fruita Trail Half
May 12, 2024
Rim Rock Marathon and Half Marathon
Nov 3, 2024
Georgetown, CO
Slacker Half Marathon
Jun 22, 2024
Georgetown to Idaho Springs Half Marathon
Aug 10, 2024
Steamboat Springs, CO
Steamboat Marathon
Jun 2, 2024
Emerald Mountain Epic
Aug 4, 2024
Buena Vista, CO
Spirit Trail Run
May 26, 2024
Trail Sisters Women's Half Marathon
Sep 14, 2024
Autumn Run
Sep 21, 2024
Parker, CO
Labor Day Half Marathon
Sep 2, 2024
Westminster, CO
All-Out Beat the Heat
Apr 13, 2024
Time Travel Half Marathon
Apr 20, 2024
All-Out Dog Days
Jul 13, 2024
Hometown Half Marathon
Aug 11, 2024
Westminster Trail Race
Aug 24, 2024
All-Out Fall Fest
Sep 14, 2024
Prairie Dog Half and 10K/5K
Sep 28, 2024
Spooky Sprint - Denver
Oct 5, 2024
Westy Half & 5K
Oct 13, 2024
All-Out Fa La La
Dec 7, 2024
Winter Park, CO
Byers Peak Stampede
Aug 24, 2024
Erie, CO
Erie Half & 5K
Aug 18, 2024
Pueblo, CO
Rock Canyon Half Marathon
Dec 3, 2023
Louisville, CO
Colorado 13er
Jun 2, 2024
Louisville Trail Race
Sep 28, 2024
Arctic Prairie Dog Half
Jan 19, 2025
Castle Rock, CO
Rock Hawk Trail Races
Apr 27, 2024
July 4th ROCK-IT Run
Jul 4, 2024
Prairie Dog Half and 10K - Castle Rock
Jul 20, 2024
Castle Rock Trail Festival
Oct 5, 2024
Nederland, CO
Ned Ned Run
Sep 9, 2023
Vail, CO
Dynafit Half Marathon
Aug 17, 2024
Aspen, CO
Aspen Backcountry Marathon
Aug 5, 2023
Aspen Valley Marathon
Jul 13, 2024
Golden Leaf Half Marathon
Sep 28, 2024
Highlands Ranch, CO
Mountain Ridge Trail Race
Jun 1, 2024
HRCA Backcountry Wilderness Half Marathon
Nov 2, 2024
Arvada, CO
Ralston Creek Half Marathon
Feb 18, 2024
Spring Fling Prairie Dog Half
Apr 14, 2024
All-Out Summer Breeze
Jun 8, 2024
All-Out Runapalooza
Aug 3, 2024
All-Out Polar Prowl
Jan 11, 2025
All-Out Mardi Crawl
Feb 22, 2025
Estes Park, CO
Estes Park Marathon
Jun 16, 2024
Jun 15, 2024
Rocky Mountain Half Marathon
Aug 2, 2024
Aug 3, 2024
Boulder, CO
Latino Ultra Nature Adventure
Oct 22, 2023
Boulder Rez Half
Apr 13, 2024
Boulder Mothers Day Run
May 12, 2024
Boulder Rez Marathon
Aug 3, 2024
Boulderthon: Downtown Boulder Marathon
Sep 29, 2024
Brighton, CO
Adams Half & 5K
Sep 17, 2023
Blue Heron Half and 5K
Apr 21, 2024
Runs With Scissors Races
Apr 27, 2024
Pagosa Springs, CO
Turkey Springs Showdown Trail Races
Aug 10, 2024
Trinidad, CO
The Rad Dirt Fest
Sep 28, 2024
Basalt, CO
Basalt Half Marathon
Jun 1, 2024
Ridgway, CO
John Wayne Grit Series
Sep 21, 2024
Telluride, CO
Deep Creek Trail Half Marathon
Sep 28, 2024
Greenwood Village, CO
That Dam Run
Mar 3, 2024
Salida, CO
Run Through Time Marathon
Mar 8, 2025
Bellvue, CO
Black Squirrel Half Marathon
Sep 7, 2024
Sterling, CO
Center of the Nation Series - Day 1
Sep 30, 2024
Creede, CO
Runoff Runoff
Jun 3, 2023
Bayfield, CO
Vallecito Lake Heavy Half
May 11, 2024
Firestone, CO
Carbon Valley Half Marathon
May 11, 2024
Beulah, CO
Beulah Challenge
Sep 21, 2024
Byers, CO
BINGO! Trail Runs
Nov 9, 2024
Mancos, CO
Mancos Cowboy Half Marathon
Oct 14, 2023
Divide, CO
Endure Trail Runs
May 18, 2024
Fort Collins, CO
Spring Equinox Races
Mar 24, 2024
Horsetooth Half Marathon
Apr 14, 2024
Colorado Marathon
May 5, 2024
Human Race
Aug 10, 2024
Fall Equinox Marathon
Sep 22, 2024
Colorado Brewery Running Series
Oct 6, 2024
Long View Marathon
Oct 12, 2024
Four Corners Monument, CO
Four Corners Quad Keyah
Dec 7, 2024
Red Feather Lakes, CO
Red Feather Trail Jamboree
Sep 21, 2024
Sep 20, 2024
Sep 22, 2024
Severance, CO
Great Western Trail Race
Apr 20, 2024
Jamestown, CO
Calarat Challenge Trail Running Festival
Sep 3, 2023
Sat | Sun | Mon | Tue | Wed | Thu | Fri | Multiple |
1. Runoff Runoff
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Past DateJun 3, 2023Saturday
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26.2M, 13.1M, 6.6K run
More Information
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Creede, CO
Mineral County, CO
2. South Park Trail Marathon
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Past DateJun 3, 2023Saturday
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26.2M, 13.1M run
More Information
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Fairplay, CO
Park County, CO
3. Evit's Hope Half
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Past DateJun 10, 2023Saturday
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13.1M, 5K, 1M trail run
Virtual OptionMore Information
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Colorado Springs, CO
El Paso County, CO
4. Storm the Castle
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CancelledJul 15, 2023Saturday
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13.1M trail run
Virtual OptionMore Information
- Guffey, CO
5. Aspen Backcountry Marathon
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Past DateAug 5, 2023Saturday
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26.2M, 13.1M trail run
More Information
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Aspen, CO
Pitkin County, CO
6. Breck Crest Mountain Marathon
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Past DateSep 3, 2023Sunday
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23M, 13.1M, 10K trail run
More Information
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Breckenridge, CO
Summit County, CO
7. Calarat Challenge Trail Running Festival
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Past DateSep 3, 2023Sunday
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13.1M, 10K, 5K trail run | kids run
More Information
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Jamestown, CO
Boulder County, CO
8. Ned Ned Run
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Past DateSep 9, 2023Saturday
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13.1M, 10K, 5K trail run
More Information
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Nederland, CO
Boulder County, CO
9. Adams Half & 5K
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Past DateSep 17, 2023Sunday
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13.1M, 5K run
More Information
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Brighton, CO
Adams County, CO
10. Breckenridge Road Marathon
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Past DateOct 7, 2023Saturday
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26.2M, 13.1M, 10K run | kids run
More Information
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Boston Marathon Qualifier
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Breckenridge, CO
Summit County, CO
11. Mancos Cowboy Half Marathon
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Past DateOct 14, 2023Saturday
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13.1M, 5K run | kids run
More Information
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Mancos, CO
Montezuma County, CO
12. Latino Ultra Nature Adventure
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Past DateOct 22, 2023Sunday
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55K, 13.1M, 10K, 5K run
More Information
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Boulder, CO
Boulder County, CO
13. Rock Canyon Half Marathon
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Past DateDec 3, 2023Sunday
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13.1M run
More Information
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Pueblo, CO
Pueblo County, CO
14. Ralston Creek Half Marathon
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Past DateFeb 18, 2024Sunday
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13.1M, 5K run
More Information
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Arvada, CO
Jefferson County, CO
15. Time to Paddy 5K/10K and Lucky 13.1
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Past DateMar 2, 2024Saturday
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13.1M, 10K, 5K run | kids run
Virtual OptionMore Information
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Colorado Springs, CO
El Paso County, CO
16. That Dam Run
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Past DateMar 3, 2024Sunday
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13.1M, 10K, 5K run | kids run
More Information
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Greenwood Village, CO
Arapahoe County, CO
17. Time to Paddy 5K/10K and Lucky 13.1
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Past DateMar 3, 2024Sunday
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13.1M, 10K, 5K run | kids run
Virtual OptionMore Information
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Denver, CO
Denver County, CO
18. Spring Equinox Races
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Past DateMar 24, 2024Sunday
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13.1M, 5K run
More Information
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Fort Collins, CO
Larimer County, CO
19. Three Creeks Half Marathon
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Past DateApr 7, 2024Sunday
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13.1M run
More Information
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Denver, CO
Denver County, CO
20. All-Out Beat the Heat
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Past DateApr 13, 2024Saturday
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13.1M, 10K, 5K run
Virtual OptionMore Information
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Boston Marathon Qualifier
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Westminster, CO
Adams County, COJefferson County, CO
For the love of all that Is good And moisture wicking...
Though we Try To be accurate And On top Of things... Race details can change When we aren't lookin. And once in a while we simply make a mistake.
ALWAYS visit the race's website for the most complete and accurate race information.
ALWAYS visit the race's website for the most complete and accurate race information.