May Classic Races in Colorado on Weekends
Thornton, CO
Head and Neck Cancer A Hard Thing to Swallow 5K/10K
May 12, 2024
Donot Stop
May 10, 2025
Hayden, CO
Hayden Cog Run
May 4, 2024
Denver, CO
RMRR Trophy Series - May
May 5, 2024
Mothers Day 5K
May 11, 2025
Denver Colfax Marathon
May 18, 2025
May 17, 2025
The Ol' College Try 24 Hour Ultra
May 24, 2025
Colorado Springs, CO
Bash the Bluffs 5K
May 4, 2024
Head and Neck Cancer A Hard Thing to Swallow 5K/10K
May 11, 2024
Women's Distance Festival
May 11, 2024
Ram Party
May 18, 2024
May 19, 2024
Run to the Shrine
May 18, 2024
May 19, 2024
Nielson Two Mile Challenge
Mar 1, 2025
Apr 5, 2025
May 3, 2025
Jun 7, 2025
8 more
Take 5 in the Garden
May 3, 2025
Valkyrie Trail Race
May 10, 2025
Donot Stop
May 11, 2025
Aurora, CO
Altitude Elementary Moose Mudder
May 4, 2025
Durango, CO
Narrow Gauge 10 Mile
May 26, 2024
Steamboat Springs, CO
Spirit Challenge
May 18, 2024
Centennial, CO
High Line Canal Run
May 11, 2024
Buena Vista, CO
Endura Mamas 5K and Family Fun Run
May 11, 2024
Collegiate Peaks Trail Run
May 3, 2025
Spirit Trail Run
May 25, 2025
Westminster, CO
Colorado Women's Classic - Westminster
May 11, 2025
Englewood, CO
Front Range Classic
May 25, 2024
Castle Rock, CO
Memorial Day Run & March
May 18, 2024
Loveland, CO
New Vision 5K
May 4, 2024
Run For The Trees
May 4, 2024
Run for the Trees - BSBF 2 Mile Run
May 4, 2024
Highlands Ranch, CO
HRCA Mother's Day 5K
May 11, 2024
Littleton, CO
Colorado Friends of First Responders
May 11, 2024
Colorado Friends of First Responders Annual Run
May 11, 2024
Arvada, CO
Hope House 5K & Fun Run
May 4, 2024
CMRA Tucker Lake 6.5 Mile
May 11, 2024
Miles for Smiles 5K
May 19, 2024
Brighton, CO
Adams County Foster Care 5K
May 4, 2024
Pagosa Springs, CO
Habitat Archuleta's 15 Homes in 5
May 17, 2025
Salida, CO
Tails on the Trail
May 18, 2024
Lakewood, CO
Federal Cup 5K
May 4, 2024
GiGi's 5K
May 4, 2024
Canon City, CO
runBlossom 5K
May 4, 2024
Eagle, CO
Boneyard Boogie
May 18, 2024
Bayfield, CO
Vallecito Lake Heavy Half
May 11, 2024
Firestone, CO
Carbon Valley Half Marathon
May 11, 2024
Dumont, CO
Canine On the Creek
May 17, 2025
Fort Carson, CO
Ft. Carson Taco Trot
May 4, 2024
Larkspur, CO
Greenland Trail Races
May 3, 2025
Keenesburg, CO
We Care Community 5K
May 4, 2024
Divide, CO
Endure Trail Runs
May 17, 2025
Fort Collins, CO
Quad Rock 50
May 11, 2024
Healing Warriors Program 5K Fun Run
May 19, 2024
Colorado Marathon
May 4, 2025
Sat | Sun | Mon | Tue | Wed | Thu | Fri | Multiple |
1. Aspen parkrun
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May 3, 2025Saturday
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5K run
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Aspen, CO
Pitkin County, CO
2. Collegiate Peaks Trail Run
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May 3, 2025Saturday
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50M, 25M trail run
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Buena Vista, CO
Chaffee County, CO
3. Greenland Trail Races
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May 3, 2025Saturday
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50K, 25K, 8M, 4M trail run
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Larkspur, CO
Douglas County, CO
4. Nielson Two Mile Challenge
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May 3, 2025Saturday
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2M trail run
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Colorado Springs, CO
El Paso County, CO
5. South Boulder Creek parkrun
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May 3, 2025Saturday
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5K run
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Boulder, CO
Boulder County, CO
6. Take 5 in the Garden
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May 3, 2025Saturday
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5M, 5K run | 9.5M, 5M trail run
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Colorado Springs, CO
El Paso County, CO
7. Adams County Foster Care 5K
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Past DateMay 4, 2024Saturday
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5K, 1M run
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Brighton, CO
Adams County, CO
8. Altitude Elementary Moose Mudder
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May 4, 2025Sunday
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5K, 1K run
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Aurora, CO
Arapahoe County, CO
9. Bash the Bluffs 5K
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Past DateMay 4, 2024Saturday
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5K, 1M run | kids run
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Colorado Springs, CO
El Paso County, CO
10. Colorado Marathon
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May 4, 2025Sunday
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26.2M, 13.1M, 10K, 5K run | 26.2M relay
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Boston Marathon Qualifier
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Fort Collins, CO
Larimer County, CO
11. Duck Waddle 5K
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Past DateMay 4, 2024Saturday
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5K run
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Estes Park, CO
Larimer County, CO
12. Federal Cup 5K
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Past DateMay 4, 2024Saturday
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5K run | kids run
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Lakewood, CO
Jefferson County, CO
13. Ft. Carson Taco Trot
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Past DateMay 4, 2024Saturday
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5K run
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Fort Carson, CO
El Paso County, CO
14. GiGi's 5K
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Past DateMay 4, 2024Saturday
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5K run
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Lakewood, CO
Jefferson County, CO
15. Girls on the Run 5K
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Past DateMay 4, 2024Saturday
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5K run
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Fruita, CO
Mesa County, CO
16. Hayden Cog Run
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Past DateMay 4, 2024Saturday
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8.4M, 5K run
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Hayden, CO
Routt County, CO
17. Hope House 5K & Fun Run
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Past DateMay 4, 2024Saturday
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5K, 1M run
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Arvada, CO
Jefferson County, CO
18. Longmont Half Marathon
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May 4, 2025Sunday
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13.1M, 5K run
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Longmont, CO
Boulder County, CO
19. New Vision 5K
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Past DateMay 4, 2024Saturday
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5K run
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Loveland, CO
Larimer County, CO
20. Run For The Trees
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Past DateMay 4, 2024Saturday
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2M run
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Loveland, CO
Larimer 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.