Running Races in Colorado

Colorado has 369 upcoming running races scheduled for 2026. Most of the calendar falls in the warmer months: 241 of 369 races (65%) take place between May and September, with August (89 events) the busiest month. No single city dominates the calendar. Colorado Springs leads with 45 races, followed by Denver (36), Centennial (34), and Littleton (16). The remaining 64% of the calendar is spread across smaller cities.