Marathon Races in Colorado
Find upcoming marathon races in Colorado — with dates, locations, and direct registration links.
86 upcoming marathon races found in Colorado
Upcoming Marathon Races in Colorado
1/2 Marathon
Steamworks Half Marathon
Jun 6, 2026
Durango, CO
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5k for 22q Run/Walk/Ride (IN PERSON- ERIE, COLORADO)2.2 for 22q Run/Walk/Ride (IN PERSON- ERIE, COLORADO)
2.2 for 22q Walk/Run/Ride 2026
Jun 6, 2026
Anywhere, CO
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5K Registration10K Registration
Run for Breast Cancer 5K/10K/13.1 DENVER/AURORA
Jun 6, 2026
Centennial, CO
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5K Registration10K Registration
SuperHeroes Run 5K/10K/13.1 DENVER/AURORA
Jun 6, 2026
Centennial, CO
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Half Marathon
Basalt Half Marathon
Jun 6, 2026
Basalt, CO
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Elevation Challenge (14-hr)6-Mile
Summits Trail Runs
Jun 6, 2026
Granby, CO
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MarathonHalf Marathon
The Steamboat Marathon
Jun 7, 2026
Steamboat Springs, CO
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Half Marathon5K
Colorado Brewery Running Series – Breckenridge Half Marathon and 5K
Jun 7, 2026
Littleton, CO
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Half Marathon10K
All-Out Summer Breeze
Jun 13, 2026
Arvada, CO
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5k run or walk10k run or walk
Red, White and Brew 5k, 10k & Half Marathon
Jun 20, 2026
Windsor, CO
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5K Registration10K Registration
Sloth Run 5K/10K/13.1 DENVER/AURORA
Jun 20, 2026
Centennial, CO
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Half MarathonHalf Marathon - Military Veteran
Slacker Half Marathon-Relay-4-Mile Races
Jun 20, 2026
Georgetown, CO
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5K Registration10K Registration
Run Juneteenth Day 5K/10K/13.1 DENVER/AURORA
Jun 20, 2026
Centennial, CO
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Half Marathon
Estes Park Marathon & Half Marathon
Jun 21, 2026
Estes Park, CO
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40 Mile -ish Mountain Bike26 Mile -ish Mountain Bike
Race in the Clouds - Alma Dirt Festival 2026
Jun 25, 2026
Alma, CO
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Half MarathonHalf Marathon - Military Veteran
Slacker Half Marathon-Relay-4-Mile Races
Jun 27, 2026
Georgetown, CO
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5K Registration10K Registration
Run for Chocolate 5K/10K/13.1 DENVER/AURORA
Jul 4, 2026
Centennial, CO
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5K Registration10K Registration
July 4th Run 5K/10K/13.1 DENVER/AURORA
Jul 4, 2026
Centennial, CO
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Half Marathon
Colorado Brewery Running Series – The Wheat Ridge Half Marathon
Jul 5, 2026
Wheat Ridge, CO
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Kids Dash1 Mile
Heatwave Half Marathon - Denver
Jul 11, 2026
Denver, CO
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Half Marathon10K
All-Out Dog Days
Jul 11, 2026
Westminster, CO
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Kids Dash1 Mile
Heatwave Half Marathon - Colorado Springs
Jul 12, 2026
Colorado Springs, CO
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Half Marathon10k
Summer Splash Prairie Dog Half, 10k, & 5k
Jul 18, 2026
Castle Rock, CO
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5K Registration10K Registration
Run for Donuts 5K/10K/13.1 DENVER/AURORA
Jul 25, 2026
Centennial, CO
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Aspen Valley MarathonAspen Valley HALF Marathon
Aspen Valley Marathon
Jul 25, 2026
Aspen, CO
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5K Registration10K Registration
Run for Coffee Lovers 5K/10K/13.1 DENVER/AURORA
Jul 25, 2026
Centennial, CO
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10K5K
5K - Individual Age group/open
Aug 1, 2026
Colorado Springs, CO
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5K10K
Popsicle 5K/10K/Half Marathon -Colorado Springs
Aug 1, 2026
Colorado Springs, CO
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Half Marathon
Rocky Mountain Half Marathon
Aug 1, 2026
Estes Park, CO
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5K5K-No Shirt
Popsicle 5K/10K/Half - Colorado Springs
Aug 1, 2026
Colorado Springs, CO
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