SM
May 17, 2026
Full Marathon, Half Marathon, 5K, Relay
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Denver Colfax Marathon
Denver's only marathon, celebrating 20 years with a course through Mile High Stadium and the city's best neighborhoods.
Verified listing
Source: official site
Updated today
Official registration linked
Race facts
Core planning details from the race record.
- Race date
- Sunday, May 17, 2026
- Location
- Denver, Colorado, United States
- Distance
- Full Marathon, Half Marathon, 5K, Relay
- Price
- $100
- Registration
- Official registration linked
- Organizer
- Colfax Marathon
Distances
Full marathon
Half marathon
5K
Relay
Planning timeline
- Registration opens
- Not published
- Registration closes
- Not published
- Race day
- Sunday, May 17, 2026
Not sure this race fits your season?
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- Before you register Talk through course fit, travel friction, timing, and whether this race belongs in your year.
- After you commit Use club rhythm to keep the training block moving after the exciting first week.
- When plans change Get a practical place to rethink the goal instead of dropping the plan silently.