Endurance Grid lists 313 running races in Colorado, from August 2026 to August 2027 across 91 cities.
The lay of the land
The running race calendar in Colorado is busiest in September, August, and October, with races most often in Denver, Centennial, Colorado Springs, and Littleton.
Organized running races are one of the most accessible entry points into endurance sports. There’s a distance for every fitness level and a community at every start line. Distances run from 1-mile fun runs and 5Ks up through the 10K, half marathon, and marathon.
Most races are timed and chip-scored, with a mass or wave start and aid stations along the course. Big-city races keep the noise going the whole way; smaller races give you long stretches where it’s just you and the miles.
Frequently Asked Questions (FAQs)
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Endurance races in Colorado happening in the next 7 days, in date order. Browse what’s coming up and sign up soon.
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