Colfax Marathon

Colfax Marathon
Date May 17, 2025 -
May 18, 2025
Distance 5k, 10mi, Half-marathon, Marathon, Relay
Course Type Road


Race Information

The Colfax Marathon is Denver's largest running weekend. Runners get to pick from the marathon, marathon relay, half marathon, or urban 10 miler and enjoy Denver’s iconic landmarks. Just getting started on the running scene? There's a 5k for that. Finish your 26.2 into a huge post-race party with live music, food, & drinks.

A Boston Marathon qualifier, the Colfax Marathon should be on the bucket list for every runner!


Shokz Headphone Giveaway and Shokz are giving away a pair fo Kipchoge Limited Edition OpenRun Pro headphones. 

Marathoning legend Eliud Kipchoge just joined forces with Shokz, the bone conduction headphone innovator to release a limited edition headphone.

Limited to 5,000 pairs only.

These headphones are inspired by Kipchoge's NN Running Team, featuring a sleek design with vibrant orange (think passion for running) and steadfast gray (think endurance).

Combined with the Shokz OpenRun Pro’s bone conduction tech, you get outstanding audio, a secure and comfortable fit, and an open-ear design that lets you hear your music clearly and stay aware of your surroundings.

> Click Here to learn more about the headphones <

Click the button below to enter the giveaway!

Enter Giveaway

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Pace Calculator

Find your running pace and splits, and learn if you can outrun dangerous animals with the RunGuides run pace calculator.

Registration Info

Many events can only accept a certain number of runners. Register now to guarantee that you secure a spot in this event!

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