Several thousand runners and walkers take to the streets of Denver each spring for the Denver Colfax Marathon, half marathon, relay, 10M and 5K. Like the full marathon, the half marathon includes a long straight course.
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Contents
Race Info
There will be a post-race festival where spectators, family and friends are invited. There will be live music, food and drinks at the party.
The time limit for the marathon is 6 hours (pace 13:44 minutes per mile). Therefore, walkers are not allowed in the marathon and half marathon. Participants must be 16 years old to participate in the marathon, to participate in the half marathon, marathon relay or 10M race – 12 years old. Dogs are not allowed on the course.
Denver usually has warm but often still cool weather in the spring, with cold mornings possible. On the race day the average low is 43ºF and the average high is 64ºF.
Race Date
May 17-18, 2025.
Location
City Park, Denver, Colorado US
Directions
Distances
- Marathon (26.2 miles)
- Half marathon (13.1 miles)
- 10M
- 5K
Starting Time
May 17, 2025
- 9:00 AM – 5K
May 18, 2025
- 6:00 AM – full marathon
- 6:30 AM – half marathon
- 7:45 AM – 10M
Entry Fees
- $164 and up – full marathon
- $144 and up – half marathon
- $114 and up – 10M
- $110 and up – 5K
Course Map
You can find the course map and description here: runcolfax.org. The marathon course is a Boston Marathon qualifier. All courses have been accurately measured and certified by USA Track & Field.
Registration
To reserve your spot in the Denver Colfax Marathon, register online at raceroster.com.
Official Race Website
Always refer to the official website for the latest race information: runcolfax.org.
Social Media
If you are looking for more details about this race, follow its page on Facebook.
Video
Related Events
If you’re looking for more races like this, have a look at our Marathons Calendar. You may also like to participate in other races in May.
More races in Colorado: 5K, 10K, Half Marathons, Marathons, Ultra Marathons, 50K, 50M, 100K, 100M
