Denver Colfax Marathon

Save the Date for 2026! We are excited to host the Denver Colfax Marathon May 16-17, 2026. We’ll have our two-day Cigna Denver Colfax Marathon Expo at Empower Field at Mile High on Friday and Saturday. Our 5K Kickoff will be on Saturday May 16th, and our main Race Day will be on Sunday May 17th, with the Marathon, Half Marathon, Urban 10 Miler and Marathon Relay (Corporate, Government, Public Schools, and Open Relay Divisions).