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Calarat Challenge Trail Running Festival
Jamestown, CO
Saturday, August 30th, 2025
10k at 10,000 Feet
Steamboat Springs, CO
Sunday, August 31st, 2025
Cirque Series - Arapahoe Basin, CO
Keystone, CO
Saturday, September 6th, 2025
RexRun For PAWSitivity 2025 5K Trail Run/Walk
Aurora, CO
52nd Annual Imogene Pass Run
Telluride, CO
HRCA Wildcat Mountain Trail Races
Littleton, CO
Black Squirrel Half Marathon
Bellvue, CO
Valkyrie Ultra Heptathlon
Durango, CO
Saturday, September 13th, 2025
All-Out Fall Fest
Westminster, CO
Trail Sisters Women's Half Marathon & 10k
Buena Vista, CO
Mountain Marmot Trail Run presented by Durango ...
Saturday, September 20th, 2025
Rim to Rim Royal Gorge Races: 5K Road Run, Trai...
Canon City, CO
Red Feather Trail Jamboree
Red Feather Lakes, CO
Friday, September 26th, 2025
Race in the Clouds - Festival 5K
Alma, CO
Saturday, September 27th, 2025
Pagosa Mountain Chile Cha Cha Trail Races
Pagosa Springs, CO
Sangre de Cristo Trail Festival
Westcliffe, CO
West Line Winder
WILD Wahatoya Runs
La Veta, CO
Estes Epic
Estes Park, CO
14er Fest 14K & 5K
Sunday, September 28th, 2025
Camp 4 Coffee Cart to Cart 2025
Crested Butte South, CO
Saturday, October 4th, 2025
Colorado Springs Marathon, Half, 5K, and Kids K
Colorado Springs, CO
West Elk Challenge Trail Marathon
Crawford, CO
RunAbilities FUN Walk/Run/Roll
Parker, CO
Kids' Fall Series - Where Kids Run Free!
Sunday, October 5th, 2025
Fall Series - Get Dirty! Get Muddy!
Windsor Marathon, Half Marathon, 10k & 5k
Windsor, CO
Suffer Better 9th Annual Fall Trail Runs
Pine, CO
Saturday, October 11th, 2025
Rubey Rescue Run
Aspen, CO
Blue Sky Trail Marathon & Half Marathon
Fort Collins, CO
Saturday, October 18th, 2025
Mancos Cowboy Half Marathon, 5K, and Fun Run
Mancos, CO
Indian Creek Trail Runs
Sedalia, CO
The Great Trailhead Foot Race 10 Miler & 5k
Lakewood, CO
2025 Eerie Erie
Erie, CO
Saturday, October 25th, 2025
Foundry Halloween 5k
YMCA Creepy Crawl 5K
Palmer Lake, CO
Girls on the Run Northern Colorado Fall 5K
Sunday, November 2nd, 2025
All-Out Kooky-Spooky
Golden, CO
BINGO! Trail Party
Byers, CO
Saturday, November 8th, 2025
HRCA Backcountry Wilderness Half Marathon
Lone Tree, CO
Mountain Madness Fall Frenzy Orienteering Trail...
Sunday, November 9th, 2025
Canya Cañon Trail Race & Family Hike
10k Turkey Trek & 5k Turkey Trot
Arvada, CO
Saturday, November 22nd, 2025
2025 Loveland Turkey Trot
Loveland, CO
Thursday, November 27th, 2025
All-Out Fa La La
Saturday, December 6th, 2025
Sawmill Trail Runs
Rock Canyon Half Marathon
Pueblo, CO
Sunday, December 7th, 2025
Resolute Runner 5k
Thursday, January 1st, 2026
All-Out Polar Prowl
Saturday, January 10th, 2026
Rio Frio 5k on Ice
Alamosa, CO
Saturday, January 24th, 2026
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