Colfax Marathon The 9th Annual Colfax Marathon is Sunday, May 18. The 26.2 mile Denver course starts and finishes at City Park. To avoid street closures, check the route which takes takes runners west to Lakewood passing through many neighborhoods and part of the downtown business district.

2,000 volunteers are needed to be part of the Race Crew. Love the outdoors? Miles of course needs volunteers! Rather be inside? Volunteer at the Health & Fitness Expo at the Club Level Suites at Mile High Stadium. Volunteer shifts are 4 hours long and include a Race Crew shirt, “Come Back to Colfax” deals, lunch and good karma. Individual.  Check out your options here.