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Flyin' Ryan Memorial 5k
Greeley, CO
Friday, October 3rd, 2025
Big Waves Family 5K run/walk Presented by Brumate
Westminster, CO
Saturday, October 4th, 2025
Not So Flatt Breast Cancer Awareness Run/Walk
Camp 4 Coffee Cart to Cart 2025
Crested Butte South, CO
RunAbilities FUN Walk/Run/Roll
Parker, CO
Colorado Springs Marathon, Half, 5K, and Kids K
Colorado Springs, CO
I Can 5k
Thornton, CO
West Elk Challenge Trail Marathon
Crawford, CO
PRA Miner Gold Rush
Broomfield, CO
Kids' Fall Series - Where Kids Run Free!
Sunday, October 5th, 2025
Liberty Energy 5K - Benefiting the Bettering Hu...
Denver, CO
Healthy Kids Running Series Fall 2025 - Denver, CO
Strides for Sierra 5K run/walk
Arvada, CO
RMRR October Trophy Series
Aurora, CO
Windsor Marathon, Half Marathon, 10k, 5k & 1 Mi...
Windsor, CO
Layafette Music Fest Half-Marathon/10K/5K
Louisville, CO
Fall Series - Get Dirty! Get Muddy!
Gummball 5K
Brighton, CO
Saturday, October 11th, 2025
Rubey Rescue Run
Aspen, CO
Boulder XC Series Meet 1
Boulder, CO
Breckenridge Road Marathon
Breckenridge, CO
The Long View Marathon
Fort Collins, CO
Kipling Villas 5K - 2024
Littleton, CO
Chicken Creek Challenge
Mancos, CO
Manitou 5K
Manitou Springs, CO
Saint's Corp Pilgrimage Fun Run
Pagosa Springs, CO
Suffer Better 9th Annual Fall Trail Runs
Pine, CO
The bRUNch Run™ -
Sunday, October 12th, 2025
Joy & Justice 5k
Timnath, CO
Westy Half & 5k
2025 DU Crimson Classic 5K Run/1.5 Mile Walk
Tuesday, October 14th, 2025
Boulder Turkey Trot Training Program
Wednesday, October 15th, 2025
Homecoming 5k - Colorado State University
Saturday, October 18th, 2025
The Great Trailhead Foot Race 10 Miler & 5k
Lakewood, CO
Mancos Cowboy Half Marathon, 5K, and Fun Run
Blue Sky Marathon & Half
Indian Creek Trail Runs
Sedalia, CO
Blue Sky Trail Marathon & Half Marathon
Expo Park XC Runs
Sunday, October 19th, 2025
DU Crimson Classic 5K Run/1.5 Mile Walk
Wednesday, October 22nd, 2025
2025 Redrum Fun Run
Saturday, October 25th, 2025
2025 Eerie Erie
Erie, CO
YMCA of Pueblo Spooky Sprint 5K
Pueblo, CO
Halloween Fun Run 5k & 1mile - Zombie Theme
Idaho Springs, CO
Foundry Halloween 5k
Steamboat Springs, CO
YMCA Creepy Crawl 5K
Palmer Lake, CO
Apex Foundation Trick or Trot 5K & Kids' Hallow...
Race to Cure Sarcoma Denver
The 13th Annual Odyssey Odyssey - 2025
Sunday, October 26th, 2025
Ghosts and Goblins 5K/10K
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