September Races in Colorado
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.
City Location
21. SheSprints
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Sep 7, 2024Saturday
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sprint triathlon | sprint triathlon relay | sprint duathlon
More Information
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Women Only
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Aurora, CO
Arapahoe County, CO
22. 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
Denver County, CO
23. South Boulder Creek parkrun
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Sep 7, 2024Saturday
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5K run
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Boulder, CO
Boulder County, CO
24. Splashland Triathlon
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Sep 7, 2024Saturday
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sprint triathlon | sprint triathlon relay
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Alamosa, CO
Alamosa County, CO
25. Denver Rocks Run 5K/10K
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Sep 8, 2024Sunday
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10K, 5K run
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Denver, CO
Denver County, CO
26. Honey Bee Hustle
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Sep 8, 2024Sunday
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1.5H run
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Loveland, CO
Larimer County, CO
27. RMRR Trophy Series - September
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Sep 8, 2024Sunday
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10M, 5K run
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Thornton, CO
Adams County, CO
28. Tri the Rock
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Sep 8, 2024Sunday
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youth triathlon
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Castle Rock, CO
Douglas County, CO
29. Bark & Brew 5K
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Past DateSep 9, 2023Saturday
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5K run
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Lakewood, CO
Jefferson County, CO
30. Blue Shoe Run for Prostate Cancer
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Past DateSep 9, 2023Saturday
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5K, 1.5M run | kids run
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Denver, CO
Denver County, CO
31. Lake Nighthorse Triathlon
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Past DateSep 9, 2023Saturday
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sprint triathlon | sprint triathlon relay
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Durango, CO
La Plata County, CO
32. Ned Ned Run
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Past DateSep 9, 2023Saturday
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13.1M, 10K, 5K trail run
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Nederland, CO
Boulder County, CO
33. Ruffin' Mudder
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Past DateSep 9, 2023Saturday
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5K mud run | 5K novelty run
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Colorado Springs, CO
El Paso County, CO
34. Summit Up Trail Run
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Past DateSep 9, 2023Saturday
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9K, 5K trail run
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Copper Mountain, CO
Summit County, CO
35. Waneka Classic
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Past DateSep 9, 2023Saturday
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5K run
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Lafayette, CO
Boulder County, CO
36. 9/11 Heroes Run - Denver
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Past DateSep 10, 2023Sunday
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5K run
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Denver, CO
Denver County, CO
37. RMRR Fall Marathon Training Series
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Past DateSep 10, 2023Sunday
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30K, 20K run
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Thornton, CO
Adams County, CO
38. Tiger Prowl
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Past DateSep 10, 2023Sunday
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5K run
More Information
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Lakewood, CO
Jefferson County, CO
39. Tri-Our-Village Youth Triathlon
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Past DateSep 10, 2023Sunday
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youth triathlon
More Information
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Greenwood Village, CO
Arapahoe County, CO
40. Lakewood Trail Series
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Sep 11, 2024Wednesday
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7M, 4M trail run
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Lakewood, CO
Jefferson 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.