September Classic Races within 100 miles of Centennial, CO
Longmont, CO
Colorado Brewery Running Series
Sep 15, 2024
Thornton, CO
RMRR Fall Marathon Training Series
Aug 27, 2023
Sep 24, 2023
Sep 10, 2023
RMRR Trophy Series - September
Sep 8, 2024
Greeley, CO
Superhero Event
Sep 21, 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
Colorado Springs, CO
Be Ovary Aware 5K
Sep 17, 2023
Race Against Suicide
Sep 17, 2023
PPCC Take the Night Back
Sep 21, 2023
Nielson Two Mile Challenge
Mar 1, 2025
Apr 6, 2024
May 4, 2024
Jun 1, 2024
8 more
Orangetheory 5K at Labor Day Lift Off
Sep 1, 2024
Colorado Springs Marathon
Sep 28, 2024
Idaho Springs, CO
Flaming Foliage Relay
Sep 6, 2024
Woodland Park, CO
Pony Express Run
Sep 22, 2024
Golden, CO
Golden Gallop
Sep 22, 2024
Georgetown, CO
Colorado Brewery Running Series
Sep 28, 2024
Buena Vista, CO
Flaming Foliage Relay
Sep 6, 2024
Trail Sisters Women's Half Marathon
Sep 14, 2024
Autumn Run
Sep 21, 2024
West Line Winder
Sep 28, 2024
14er Fest Races
Sep 29, 2024
Manitou Springs, CO
Pikes Peak Ascent and Marathon
Sep 22, 2024 - Marathon
Sep 21, 2024 - Ascent
Louisville, CO
Louisville Trail Race
Sep 28, 2024
Loveland, CO
Honey Bee Hustle
Sep 8, 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
Highlands Ranch, CO
BackCountry 5K
Sep 17, 2023
Littleton, CO
Lions Roar 5K
Sep 17, 2023
Lookin For A Cure Denver
Sep 23, 2023
Second Wind Walk/Run
Sep 24, 2023
HRCA Oktoberfest 5K
Sep 14, 2024
Flyin' Lion 5K
Sep 15, 2024
Miles 4 Madison 5K
Sep 21, 2024
HRCA Wildcat Mountain Trail Races
Sep 28, 2024
Frisco, CO
Run the Rockies Half Marathon
Sep 21, 2024
Arvada, CO
Lisa Nelson's Mustang Stampede
Sep 16, 2023
Run With The Wolves
Sep 17, 2023
Forge 5K
Sep 30, 2023
Estes Park, CO
Rut Run 5K
Sep 28, 2024
Boulder, CO
South Boulder Creek parkrun
Mar 23, 2024
Mar 30, 2024
Apr 6, 2024
Apr 13, 2024
48 more
Boulderthon: Downtown Boulder Marathon
Sep 29, 2024
Copper Mountain, CO
Summit Up Trail Run
Sep 9, 2023
Brighton, CO
Gummball 5K
Sep 16, 2023
Adams Half & 5K
Sep 17, 2023
Breckenridge, CO
Breck Crest Mountain Marathon
Sep 3, 2023
Lafayette, CO
Waneka Classic
Sep 9, 2023
Lone Tree, CO
For a City 5K
Sep 16, 2023
Morrison, CO
RRCC Front Nine 5K
Sep 15, 2024
Wheat Ridge, CO
Farmers 5000
Sep 15, 2024
Windsor, CO
Windsor Wiesn Mile and 5 Mile
Sep 23, 2023
Greenwood Village, CO
Selian 5K
Sep 16, 2023
Bellvue, CO
Black Squirrel Half Marathon
Sep 7, 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
Bear Chase Race - Half Marathon & 10K
Sep 29, 2024
Sep 28, 2024
Canon City, CO
Wine Run 5K at Holy Cross Abbey
Sep 1, 2024
Commerce City, CO
Night Nation Run - Denver
Sep 28, 2024
Palmer Lake, CO
24 Hours of Palmer Lake
Sep 28, 2024
Beaver Creek, CO
The bRUNch Trail Run
Sep 17, 2023
Monument, CO
Run4Hope 5K for Schools
Sep 21, 2024
Keystone, CO
Cirque Series - Arapahoe Basin
Sep 7, 2024
Empire, CO
Devil on the Divide
Sep 7, 2024
Minturn, CO
Meadowgold Trail Run
Sep 14, 2024
Fort Collins, CO
Beef Sticks for Backpacks 5K Run/Walk
Sep 24, 2023
Fall Equinox Marathon
Sep 22, 2024
Frederick, CO
Miner's Day 5K
Sep 16, 2023
Nathrop, CO
Sawatch Ascent
Sep 29, 2024
Red Feather Lakes, CO
Lederhosen Run
Sep 23, 2023
Red Feather Trail Jamboree
Sep 21, 2024
Sep 20, 2024
Sep 22, 2024
Jamestown, CO
Calarat Challenge Trail Running Festival
Sep 3, 2023
Sat | Sun | Mon | Tue | Wed | Thu | Fri | Multiple |
1. Orangetheory 5K at Labor Day Lift Off
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Sep 1, 2024Sunday
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5K run
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Colorado Springs, CO
51 miles point to pointEl Paso County, CO
2. Wine Run 5K at Holy Cross Abbey
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Sep 1, 2024Sunday
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5K run
More Information
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Canon City, CO
80 miles point to pointFremont County, CO
3. Labor Day Half Marathon
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Sep 2, 2024Monday
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13.1M, 10K, 5K run
More Information
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Parker, CO
7 miles point to pointDouglas County, CO
4. 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
62 miles point to pointSummit County, CO
5. 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
46 miles point to pointBoulder County, CO
6. Lakewood Trail Series
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Sep 4, 2024Wednesday
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7M, 4M trail run
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Lakewood, CO
14 miles point to pointJefferson County, CO
7. Roost Rebellion Relays
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Sep 4, 2024Wednesday
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4M relay
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Denver, CO
12 miles point to pointDenver County, CO
8. Flaming Foliage Relay
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Sep 6, 2024Friday
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160M relay
More Information
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startIdaho Springs, CO35 miles point to pointfinishBuena Vista, CO84 miles point to pointClear Creek County, COChaffee County, CO
9. 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
74 miles point to pointLarimer County, CO
10. Cirque Series - Arapahoe Basin
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Sep 7, 2024Saturday
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8.8M trail run
More Information
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Keystone, CO
56 miles point to pointSummit County, CO
11. 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
45 miles point to pointClear Creek County, CO
12. Nielson Two Mile Challenge
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Sep 7, 2024Saturday
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2M trail run
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Colorado Springs, CO
51 miles point to pointEl Paso County, CO
13. 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
11 miles point to pointArapahoe County, CO
14. 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
12 miles point to pointDenver County, CO
15. South Boulder Creek parkrun
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Sep 7, 2024Saturday
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5K run
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Boulder, CO
36 miles point to pointBoulder County, CO
16. 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
12 miles point to pointDenver County, CO
17. Honey Bee Hustle
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Sep 8, 2024Sunday
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1.5H run
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Loveland, CO
57 miles point to pointLarimer County, CO
18. RMRR Trophy Series - September
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Sep 8, 2024Sunday
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10M, 5K run
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Thornton, CO
20 miles point to pointAdams County, CO
19. 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
14 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
More Information
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Denver, CO
12 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.