October Races in Colorado
Evergreen, CO
EAPL Zombie Run 5K
Oct 29, 2023
Longmont, CO
Paws in the Park
Oct 7, 2023
Glenwood Springs, CO
Halloween Hustle for Charity 5K
Oct 28, 2023
Denver, CO
Dare Great Things Cross Country Challenge
Oct 7, 2023
Grace Race 5K
Oct 7, 2023
Miles for Moms
Oct 7, 2023
UpStander 5K
Oct 7, 2023
The Odyssey Odyssey
Oct 22, 2023
DU Crimson Classic 5K
Oct 27, 2023
Hell Week Fitness 5K by Orangetheory Colorado
Oct 28, 2023
Hot Chocolate 15K/5K
Oct 6, 2024
Michael J. Fox Foundation Run
Oct 6, 2024
bRUNch Run
Oct 13, 2024
Colorado Brewery Running Series
Oct 26, 2024
MonsterDash Run
Oct 26, 2024
Ghosts and Goblins 5K/10K
Oct 27, 2024
Crested Butte, CO
Camp 4 Coffee Cart to Cart
Oct 5, 2024
Camp 4 Coffee Cart to Cart Trail Race
Oct 5, 2024
Colorado Springs, CO
Pikes Peak Road Runners Kids Fall Series
Oct 1, 2023
Oct 15, 2023
Oct 29, 2023
Nov 12, 2023
Cerus Arena
Oct 7, 2023
Trek the Trail 5K
Oct 21, 2023
Nielson Two Mile Challenge
Mar 1, 2025
Apr 6, 2024
May 4, 2024
Jun 1, 2024
8 more
Pikes Peak Road Runners Fall Series
Oct 20, 2024
Oct 6, 2024
Nov 17, 2024
Nov 3, 2024
Spooky Sprint - Colorado Springs
Oct 6, 2024
Bobcat Trail Race
Oct 19, 2024
Aurora, CO
RMRR Trophy Series - October
Oct 6, 2024
Colorado Brewery Running Series
Oct 12, 2024
Expo Park XC
Oct 13, 2024
Durango, CO
Durango Fall Classic
Oct 7, 2023
Idaho Springs, CO
Halloween Fun Run
Oct 28, 2023
Grand Junction, CO
FAMpoint5K
Oct 7, 2023
Howl-o-ween 5K & 2K Fun Run and Dog Walk
Oct 30, 2023
Woodland Park, CO
Above the Clouds Ultra
Oct 5, 2024
Steamboat Springs, CO
Foundry Halloween 5K
Oct 26, 2024
Centennial, CO
Hoofin' It Through the Hollows 5K
Oct 21, 2023
Buena Vista, CO
Hallowiener 5K
Oct 26, 2024
Westminster, CO
Hyland Hills Hockey Jag Jog 5K
Oct 6, 2023
Big Waves Family 5K
Oct 7, 2023
Not So Flatt Breast Cancer Awareness Run/Walk
Oct 5, 2024
Spooky Sprint - Denver
Oct 5, 2024
Westy Half & 5K
Oct 13, 2024
Erie, CO
Eerie Erie
Oct 28, 2023
Castle Rock, CO
Castle Rock Trail Festival
Oct 5, 2024
Loveland, CO
Brakes on Breast Cancer 5K
Oct 22, 2023
Long View Marathon
Oct 12, 2024
Narrowleaf Lake Run
Oct 27, 2024
Littleton, CO
Get Your Rear in Gear - Denver Metro
Oct 7, 2023
The Stride
Oct 29, 2023
Go Big or Go Gnome 5K
Oct 13, 2024
Boulder, CO
Avery Brewing Company Oktoberfest 4K
Oct 1, 2023
Boulder XC Series Meet 1
Oct 14, 2023
Latino Ultra Nature Adventure
Oct 22, 2023
Boulder XC Series Meet 2
Oct 28, 2023
South Boulder Creek parkrun
Mar 22, 2025
Mar 29, 2025
Apr 6, 2024
Apr 13, 2024
48 more
Breckenridge, CO
Breckenridge Road Marathon
Oct 7, 2023
Morrison, CO
Beware the Bear Trail Races
Oct 15, 2023
Run the Rocks
Oct 13, 2024
Great Trailhead Foot Race
Oct 19, 2024
Pagosa Springs, CO
Halloween Hootenanny Monster Dash 5K
Oct 28, 2023
Trinidad, CO
Dead Man 5K Trail Run
Oct 5, 2024
Gunnison, CO
Sage Burner Trail Run
Oct 12, 2024
Windsor, CO
Windsor Marathon
Oct 6, 2024
Lakewood, CO
West Side Best Side Cross Country Race
Oct 22, 2023
Canon City, CO
Tunnel Vision Duathlon
Oct 14, 2023
Commerce City, CO
Wild For Life Triathlon
Oct 13, 2024
Palmer Lake, CO
YMCA Creepy Crawl 5K
Oct 28, 2023
Mancos, CO
Mancos Cowboy Half Marathon
Oct 14, 2023
Sedalia, CO
Indian Creek Trail Runs
Oct 12, 2024
Fort Collins, CO
CSU Homecoming 5K
Oct 14, 2023
Mustang Music 5K
Oct 14, 2023
Run Fur Fun 5K
Oct 28, 2023
Colorado Brewery Running Series
Oct 6, 2024
Long View Marathon
Oct 12, 2024
Blue Sky Trail Marathon
Oct 19, 2024
Crawford, CO
West Elk Challenge Trail Marathon
Oct 5, 2024
Severance, CO
Howl-O-Ween 5K
Oct 21, 2023
Parachute, CO
5k Buck Fever Fun Run
Oct 21, 2023
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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. Pikes Peak Road Runners Fall Series
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Oct 6, 2024Sunday
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3.1M trail run
More Information
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Colorado Springs, CO
El Paso County, CO
22. RMRR Trophy Series - October
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Oct 6, 2024Sunday
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12K, 5K run
More Information
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Aurora, CO
Arapahoe County, CO
23. Spooky Sprint - Colorado Springs
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Oct 6, 2024Sunday
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13.1M, 10K, 5K, 1M run | kids run
More Information
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Colorado Springs, CO
El Paso County, CO
24. Windsor Marathon
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Oct 6, 2024Sunday
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26.2M, 13.1M, 10K, 5K run | kids run
More Information
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Windsor, CO
Weld County, CO
25. Big Waves Family 5K
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Past DateOct 7, 2023Saturday
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5K run
More Information
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Westminster, CO
Adams County, COJefferson County, CO
26. Breckenridge Road Marathon
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Past DateOct 7, 2023Saturday
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26.2M, 13.1M, 10K run | kids run
More Information
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Boston Marathon Qualifier
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Breckenridge, CO
Summit County, CO
27. Cerus Arena
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Past DateOct 7, 2023Saturday
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5K obstacle run
More Information
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Colorado Springs, CO
El Paso County, CO
28. Dare Great Things Cross Country Challenge
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CancelledOct 7, 2023Saturday
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2M run | kids run
More Information
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Denver, CO
Denver County, CO
29. Durango Fall Classic
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Past DateOct 7, 2023Saturday
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50K, 11M trail run
More Information
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Durango, CO
La Plata County, CO
30. FAMpoint5K
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Past DateOct 7, 2023Saturday
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5K, 0.5K run
Virtual OptionMore Information
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Grand Junction, CO
Mesa County, CO
31. Get Your Rear in Gear - Denver Metro
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Past DateOct 7, 2023Saturday
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5K run | kids run
More Information
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Littleton, CO
Arapahoe County, CO
32. Grace Race 5K
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Past DateOct 7, 2023Saturday
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5K run
More Information
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Denver, CO
Denver County, CO
33. Lions Roar for Fitness 5K/2.5K Challenge
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Past DateOct 7, 2023Saturday
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5K, 2.5K run
More Information
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Pueblo, CO
Pueblo County, CO
34. Miles for Moms
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Past DateOct 7, 2023Saturday
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3M run
More Information
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Denver, CO
Denver County, CO
35. Paws in the Park
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Past DateOct 7, 2023Saturday
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5K run
More Information
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Longmont, CO
Boulder County, CO
36. UpStander 5K
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Past DateOct 7, 2023Saturday
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5K run
More Information
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Denver, CO
Denver County, CO
37. Strides for Sierra 5K
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Past DateOct 8, 2023Sunday
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5K, 1K run
More Information
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Arvada, CO
Jefferson County, CO
38. Aspen parkrun
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Oct 12, 2024Saturday
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5K run
More Information
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Aspen, CO
Pitkin County, CO
39. Colorado Brewery Running Series
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Oct 12, 2024Saturday
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5K run
More Information
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Aurora, CO
Arapahoe County, CO
40. Indian Creek Trail Runs
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Oct 12, 2024Saturday
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50M, 55K, 15M, 5M trail run
More Information
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Sedalia, CO
Douglas 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.