September Races within 50 miles of Boulder, CO
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
1. Labor Day Half Marathon
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Sep 2, 2024Monday
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13.1M, 10K, 5K run
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Parker, CO
44 miles point to pointDouglas County, CO
2. 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
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Jamestown, CO
9 miles point to pointBoulder County, CO
3. Lakewood Trail Series
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Sep 4, 2024Wednesday
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7M, 4M trail run
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Lakewood, CO
24 miles point to pointJefferson County, CO
4. Roost Rebellion Relays
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Sep 4, 2024Wednesday
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4M relay
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Denver, CO
24 miles point to pointDenver County, CO
5. Flaming Foliage Relay
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Sep 6, 2024Friday
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160M relay
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startIdaho Springs, CO22 miles point to pointfinishBuena Vista, CO93 miles point to pointClear Creek County, COChaffee County, CO
6. Black Squirrel Half Marathon
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Sep 7, 2024Saturday
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13.1M trail run
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Bellvue, CO
43 miles point to pointLarimer County, CO
7. Cirque Series - Arapahoe Basin
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Sep 7, 2024Saturday
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8.8M trail run
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Keystone, CO
46 miles point to pointSummit County, CO
8. Devil on the Divide
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Sep 7, 2024Saturday
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50K, 22K trail run
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Empire, CO
28 miles point to pointClear Creek County, CO
9. Harvest Moon Long Course Triathlon
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Sep 7, 2024Saturday
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half triathlon | half duathlon
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Boulder, CO
Boulder County, CO
10. Littlefoot Triathlon
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Sep 7, 2024Saturday
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sprint triathlon
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Lakewood, CO
24 miles point to pointJefferson County, CO
11. RexRun For PAWSitivity 5K Trail Run/Walk
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Sep 7, 2024Saturday
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5K trail run | kids run
Virtual OptionMore Information
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Aurora, CO
31 miles point to pointArapahoe County, CO
12. SheSprints
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Sep 7, 2024Saturday
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sprint triathlon | sprint triathlon relay | sprint duathlon
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Women Only
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Aurora, CO
31 miles point to pointArapahoe County, CO
13. 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
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Denver, CO
24 miles point to pointDenver County, CO
14. 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
15. 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
24 miles point to pointDenver County, CO
16. Honey Bee Hustle
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Sep 8, 2024Sunday
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1.5H run
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Loveland, CO
29 miles point to pointLarimer County, CO
17. RMRR Trophy Series - September
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Sep 8, 2024Sunday
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10M, 5K run
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Thornton, CO
19 miles point to pointAdams County, CO
18. Tri the Rock
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Sep 8, 2024Sunday
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youth triathlon
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Castle Rock, CO
49 miles point to pointDouglas County, CO
19. Bark & Brew 5K
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Past DateSep 9, 2023Saturday
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5K run
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Lakewood, CO
24 miles point to pointJefferson County, CO
20. 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
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.