Find upcoming endurance races in Colorado, laid out by month. Scan the dates, line them up against your training, and find the race that fits your season.
Endurance Grid lists 286 races in Colorado, from October 2026 to October 2027 across 82 cities.
Enter a city or ZIP code
Colorado runs a year-round race calendar, so there’s almost always a race near you. The calendar is busiest in November, October, and December, with races most often held in Denver, Centennial, Colorado Springs, and Arvada.
Races in Colorado run from the high peaks and passes of the Rocky Mountains to the short-grass plains stretching east of Denver, with dry mesa country and canyons in the west. That means thin-air mountain trail ultras, resort-town road races, and flat, fast prairie courses within the same state.
Conditions vary widely by region across Colorado, so weather lives where it’s accurate — each race page shows its typical race-day high, low, and rain chance from NOAA climate normals for that venue and date.
Create a free account to save races, pace plans, and your interests to your profile.
Search every race across all 50 states by sport, distance, or your zip code.
Endurance races in Colorado happening in the next 7 days, in date order. Browse what’s coming up and sign up soon.
+ 15 more happening in the next 7 days below — keep scrolling.