Denver Colfax Marathon

May 20 - 21, 2023

We are excited to host the Denver Colfax Marathon May 20-21, 2023. We’ll have our two-day Cigna Denver Colfax Marathon Expo at Empower Field at Mile High on on Friday and Saturday, May 19-20. Our 5K Kickoff will be on Saturday May 20th, and our main Race Day will be on Sunday May 21st, with the Marathon, Half Marathon, Urban 10 Miler and Marathon Relay (Corporate, Government and Open Relay Divisions).