September Races within 25 miles of Boulder, CO
Thornton, CO
RMRR Fall Marathon Training Series
Aug 27, 2023
Sep 24, 2023
Sep 10, 2023
RMRR Trophy Series - September
Sep 8, 2024
Denver, CO
Blue Shoe Run for Prostate Cancer
Sep 9, 2023
9/11 Heroes Run
Sep 10, 2023
Sentir Venezolano 5K Walk / Run
Sep 17, 2023
Roadrunners 5K
Sep 30, 2023
Roost Rebellion Relays
Sep 4, 2024
Sloan's Lake Search Party (SLSP)! Marathon Hourly Loop Race
Sep 7, 2024
Denver Rocks Run 5K/10K
Sep 8, 2024
Colorado Brewery Running Series
Sep 14, 2024
Denver 5K
Sep 14, 2024
Nun Run
Sep 15, 2024
Move Forward 5K & 10K
Sep 21, 2024
Idaho Springs, CO
Flaming Foliage Relay
Sep 6, 2024
Golden, CO
Golden Gallop
Sep 22, 2024
Buena Vista, CO
Flaming Foliage Relay
Sep 6, 2024
Louisville, CO
Louisville Trail Race
Sep 28, 2024
Nederland, CO
Ned Ned Run
Sep 9, 2023
Broomfield, CO
Jag Jog 5K
Sep 14, 2024
Miner Gold Rush
Sep 28, 2024
Runway 5K Run for the Angels
Sep 28, 2024
Arvada, CO
Lisa Nelson's Mustang Stampede
Sep 16, 2023
Run With The Wolves
Sep 17, 2023
Forge 5K
Sep 30, 2023
Boulder, CO
South Boulder Creek parkrun
Mar 23, 2024
Mar 30, 2024
Apr 6, 2024
Apr 13, 2024
48 more
Harvest Moon Long Course Triathlon
Sep 7, 2024
Boulderthon: Downtown Boulder Marathon
Sep 29, 2024
Brighton, CO
Gummball 5K
Sep 16, 2023
Adams Half & 5K
Sep 17, 2023
Lafayette, CO
Waneka Classic
Sep 9, 2023
Morrison, CO
RRCC Front Nine 5K
Sep 15, 2024
Wheat Ridge, CO
Farmers 5000
Sep 15, 2024
Lakewood, CO
Bark & Brew 5K
Sep 9, 2023
Tiger Prowl
Sep 10, 2023
Lakewood Trail Series
Sep 4, 2024
Sep 11, 2024
Sep 18, 2024
Sep 25, 2024
Littlefoot Triathlon
Sep 7, 2024
Bear Chase Race - Half Marathon & 10K
Sep 29, 2024
Sep 28, 2024
Commerce City, CO
Night Nation Run - Denver
Sep 28, 2024
Frederick, CO
Miner's Day 5K
Sep 16, 2023
Jamestown, CO
Calarat Challenge Trail Running Festival
Sep 3, 2023
Sat | Sun | Mon | Tue | Wed | Thu | Fri | Multiple |
Event Category
Click Here to find out what Classic, Multisport, and Variety mean.
To narrow your search by a distance or event type, you will need to select Classic, Multisport, or Variety first.
To narrow your search by a distance or event type, you will need to select Classic, Multisport, or Variety first.
1. 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
9 miles point to pointBoulder County, CO
2. Lakewood Trail Series
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Sep 4, 2024Wednesday
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7M, 4M trail run
More Information
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Lakewood, CO
24 miles point to pointJefferson County, CO
3. Roost Rebellion Relays
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Sep 4, 2024Wednesday
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4M relay
More Information
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Denver, CO
24 miles point to pointDenver County, CO
4. Flaming Foliage Relay
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Sep 6, 2024Friday
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160M relay
More Information
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startIdaho Springs, CO22 miles point to pointfinishBuena Vista, CO93 miles point to pointClear Creek County, COChaffee County, CO
5. Harvest Moon Long Course Triathlon
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Sep 7, 2024Saturday
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half triathlon | half duathlon
More Information
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Boulder, CO
Boulder County, CO
6. Littlefoot Triathlon
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Sep 7, 2024Saturday
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sprint triathlon
More Information
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Lakewood, CO
24 miles point to pointJefferson County, CO
7. Sloan's Lake Search Party (SLSP)! Marathon Hourly Loop Race
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Sep 7, 2024Saturday
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26.2M, 13.1M run
More Information
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Denver, CO
24 miles point to pointDenver County, CO
8. South Boulder Creek parkrun
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Sep 7, 2024Saturday
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5K run
More Information
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Boulder, CO
Boulder County, CO
9. Denver Rocks Run 5K/10K
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Sep 8, 2024Sunday
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10K, 5K run
More Information
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Denver, CO
24 miles point to pointDenver County, CO
10. RMRR Trophy Series - September
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Sep 8, 2024Sunday
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10M, 5K run
More Information
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Thornton, CO
19 miles point to pointAdams County, CO
11. Bark & Brew 5K
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Past DateSep 9, 2023Saturday
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5K run
More Information
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Lakewood, CO
24 miles point to pointJefferson County, CO
12. Blue Shoe Run for Prostate Cancer
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Past DateSep 9, 2023Saturday
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5K, 1.5M run | kids run
More Information
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Denver, CO
24 miles point to pointDenver County, CO
13. 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
13 miles point to pointBoulder County, CO
14. Waneka Classic
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Past DateSep 9, 2023Saturday
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5K run
More Information
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Lafayette, CO
10 miles point to pointBoulder County, CO
15. 9/11 Heroes Run - Denver
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Past DateSep 10, 2023Sunday
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5K run
More Information
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Denver, CO
24 miles point to pointDenver County, CO
16. RMRR Fall Marathon Training Series
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Past DateSep 10, 2023Sunday
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30K, 20K run
More Information
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Thornton, CO
19 miles point to pointAdams County, CO
17. Tiger Prowl
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Past DateSep 10, 2023Sunday
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5K run
More Information
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Lakewood, CO
24 miles point to pointJefferson County, CO
18. Lakewood Trail Series
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Sep 11, 2024Wednesday
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7M, 4M trail run
More Information
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Lakewood, CO
24 miles point to pointJefferson County, CO
19. All-Out Fall Fest
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Sep 14, 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
17 miles point to pointAdams County, COJefferson County, CO
20. Colorado Brewery Running Series
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Sep 14, 2024Saturday
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5K run
More Information
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Denver, CO
24 miles point to pointDenver 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.