Registration details are on the race's own site.
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| Event | Distance | When | Entry fee | Cap |
|---|---|---|---|---|
| Saturday, May 15, 2027 | ||||
| Colfax 5K | 5K | May 15, 20279:00 AM | See registration | – |
| Sunday, May 16, 2027 | ||||
| Marathon | Marathon | May 16, 20276:00 AM | See registration | – |
| Marathon Relay | Relay | May 16, 20276:00 AM | See registration | – |
| Half Marathon | Half Marathon | May 16, 20276:30 AM | See registration | – |
| Urban 10 Miler | 10 Mile | May 16, 20277:45 AM | See registration | – |
Fees and dates are from the race's official website on the date shown below; confirm them there before you register.
A typical finisher at a marathon in Colorado runs 4:22:49, about 10:01 a mile, based on 6 races with published results. Women typically finish in 4:34:31 and men in 4:12:33.
Sunrise on race morning is at about 5:44 AM, and the Colfax 5K starts at 9:00 AM.
Fees exclude processing fees. Comparisons use current entry fees and published results from races nearby.
City Park, east side of Ferril Lake, Denver, CO
The pin marks the address the race lists, which is usually the start. The organizers have not shared a course map with us yet.
What runners should know about Denver Colfax Marathon, in brief, from the official race website.
Schedule and packet pickup
Packets are collected at the expo in the Club Suites area of Empower Field at Mile High on the Friday and Saturday before race day. There is no packet pickup on Sunday. Colfax 5K runners can also get their packet in City Park on the Saturday morning from 7:30 a.m.
Schedule and packet pickup
The chip timed 5K on Saturday loops City Park and Ferril Lake from the marathon start and finish line. It has a stroller friendly family and walk wave and a dog wave. A separate Girls on the Run 5K follows at 10:30 a.m.
Course
The marathon allows 6 hours and the half 3 hours 25 minutes; the half includes a mile inside Denver Zoo. The Urban 10 Miler covers the last 10 miles of the marathon route from Rocky Mountain College of Art and Design, with wave starts from 7:45 to 8:45 a.m. and a 2.5 hour limit.
Parking and travel
The start and finish festival sits in City Park between the Denver Museum of Nature and Science and Ferril Lake. The site advises arriving early for parking. Urban 10 Miler bibs include an RTD ticket for the ride back to your car, and relay runners park near the start of their own leg.
Awards
Overall and masters awards go three deep on gun time; age group awards go three deep on chip time. A new event record pays $1,000, with another $1,000 for a state record. Finishers get a medal, tech shirt, free photos and a brat or vegetarian lunch at the City Park festival.
More from the race
Teams of five split the marathon course into five legs, with the first leg leaving City Park at 6 a.m. Divisions cover open teams plus employee teams from companies, government agencies and K-12 public schools. A captain registers the team and need not know all five runners at signup.
Facts on this page come from the race's official website (runcolfax.org, runcolfax.org/races/marathon, runcolfax.org/races/half-marathon, runcolfax.org/races/urban-10-miler), checked Sep 27, 2026. Confirm dates and fees there before you travel.
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Denver's only marathon, a Boston qualifier that starts and finishes in City Park. The full course passes through Empower Field at Mile High twice and Denver Fire Station #1, follows about seven miles of creeks, rivers and lakes including Sloan's Lake, and runs along Colfax Avenue and through downtown.