Running Races in Colorado

Colorado has 368 upcoming running races scheduled for 2026. Most of the calendar falls in the warmer months: 247 of 368 races (67%) take place between May and September, with August (87 events) the busiest month. No single city dominates the calendar. Colorado Springs leads with 43 races, followed by Denver (37), Centennial (33), and Littleton (16). The remaining 65% of the calendar is spread across smaller cities.