The Colfax Marathon is Denver&rsquo;s signature running event, offering an incredible combination of urban adventure, scenic routes, and an unbeatable race-day atmosphere. With a course that winds through some of the city&rsquo;s most vibrant neighborhoods, historic districts, and along the scenic Platte River, this race delivers a true Mile High experience.
Participants begin their journey near City Park, taking in panoramic views of the Denver skyline and the Rocky Mountains in the distance. The course takes runners past iconic landmarks, beautiful lakefront paths, and the bustling energy of Colfax Avenue, one of the longest continuous streets in the U.S. A unique highlight of this marathon is the opportunity to run through Denver Fire Station #1, offering an unforgettable mid-course experience.
Beyond the full marathon, runners can choose from multiple race distances, including the half marathon, urban 10-miler, and marathon relay, making the event accessible to runners of all skill levels. Enthusiastic crowd support and lively entertainment along the route keep the energy levels high, ensuring a motivating and fun-filled experience from start to finish.
The post-race festival in City Park provides an ideal way to celebrate, featuring live music, food trucks, and a gathering of runners from across the country. Whether aiming for a personal best or simply soaking in the atmosphere, the Colfax Marathon captures the essence of running in the heart of Denver.
<h3>Why Runners Love This Race</h3>
<ul>
<li style="font-weight: 400;" aria-level="1">Scenic and Urban Blend &ndash; A course featuring downtown landmarks, waterfront trails, and mountain views.</li>
<li style="font-weight: 400;" aria-level="1">Fast and Engaging Course &ndash; A great mix of flat stretches and mild rolling hills keeps the race exciting.</li>
<li style="font-weight: 400;" aria-level="1">High-Energy Spectator Support &ndash; Local communities and event organizers bring incredible enthusiasm and entertainment.</li>
<li style="font-weight: 400;" aria-level="1">A Race for Everyone &ndash; Multiple distance options make it an inclusive and well-rounded event.</li>
</ul>
<h3>Things to Keep in Mind</h3>
<ul>
<li style="font-weight: 400;" aria-level="1">Mile-High Elevation &ndash; Runners traveling from lower altitudes should allow time to acclimate.</li>
<li style="font-weight: 400;" aria-level="1">Variable Weather &ndash; Denver&rsquo;s spring conditions can range from cool mornings to warm afternoons.</li>
</ul>
For runners looking for a thrilling city marathon in one of the most active and outdoors-loving cities in the U.S., the Colfax Marathon offers an unforgettable experience.

Denver welcomed over 25,000 runners to the Mile High for the city’s largest running event of the year. The 19th Denver Colfax Marathon, presented by Cigna Healthcare, hosted eight races over the weekend with several event records broken and a historic number of runners. Athletes from around the world and all 50 states competed in the event, but Colorado runners swept the podium on race day.

Record Breaking Year in the Denver Colfax Marathon Weekend

Colfax Marathon

Pre-Race Review/ Lineup

The 2025 Colfax Marathon on Sunday, May 18, is expected to have 25,000 participants in all distances.

2025 Denver Colfax Marathon to Welcome 25,000 Runners to the Mile High

A first look at the medals of the 2025 Colfax Marathon on May 18.

Marathon Summary

Marathon Results