Colorado Runner - Colorado's running news, events and results source

Register now to beat the price increase for the Colfax Marathon! Early bird pricing ends January 26. The Denver Colfax Marathon will be held on May 14, and May 15, 2022.

On May 7th, Colorado Runner Events hosted the 18th annual Greenland Trail Races at Greenland Open Space in Larkspur. The race consisted of a trail 4 mile, 8 mile, 25K and 50K ultramarathon.

Celebrate Mother's Day at the 2022 Mother's Day 5K on Sunday, May 8. The starter's gun goes off at 9:00 am at Denver's City Park. The race is chip timed by Colorado Race Timing, featuring live results and the ability to sign up for race day texts or emails.