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May 16-17, 2026
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2025 Holiday Promotion
This promotion has ended
Register
for your race now for the 20th year of the Denver Colfax Marathon!
Home
All Events
Colfax Marathon Races
Colfax Marathon Awards Evening
Colorado Running Hall of Fame
Colorado Running & Walking Event Alliance
Colfax Races
Race Weekend Events
Marathon
Half Marathon
Urban 10 Miler
Marathon Relay – Overview
> Corporate Marathon Relay
> Government Marathon Relay
> Public School Marathon Relay
> Open Marathon Relay
Colfax 5K
Register
Runner Info
Race Weekend Events
Elite Program
2-Day Mile High Challenge
Colfax Double Marathon Challenge
5-10-15 Year Loyal Runners
Athletes with Disabilities
2026 Official Hotels
FAQ for 2026
Colfax Store
Ambassador Team
Featured Running Clubs
Race Results
Denver – Plan Your Trip!
Run for a Nonprofit
Charities
Our Charity Partners
Run for a Nonprofit
Charity Partners Program
Colfax Fly Feet Youth Program
Schools – Raise or Win Money
Charity Partners Login Library
Training
Training App – Runkeeper Go
Tips from our Medical Director
Featured Running Clubs
Training Programs
Sponsors
Sponsorship
Our Sponsors
Volunteer
About
About Us
Latest News
Privacy Policy
Contact Us
Stay Informed
