August 19, 2025
The Denver Colfax Marathon, recognized as a premier running event in the Mile High City, has officially opened registration for its 20th anniversary race weekend scheduled for May 15-17, 2026. This significant milestone highlights two decades of tradition, growth, and community engagement surrounding this celebrated marathon.
Embracing Two Decades of Running Tradition
Since its inaugural event in 2006, which welcomed just 4,000 runners, the Denver Colfax Marathon has grown exponentially to become the largest running event in Denver’s annual calendar. Today, it attracts more than 25,000 participants, showcasing the race’s increasing popularity and the thriving running community within the city.
“This milestone year marks a historic moment in Denver,” expressed Andrea Dowdy, CEO of the Denver Colfax Marathon. “Denver’s only marathon weekend is now twenty years strong, and our community has embraced this race year after year. We’re grateful to be the finish line that has inspired so many runners to achieve their goals. We are excited to celebrate this memorable year with all of you!”
Registration Details for 2026 Race Weekend
Registration for the 2026 marathon weekend officially opens on August 19, 2025. The weekend will feature an assortment of races spanning two days, including a full marathon, a half marathon, an urban 10-mile race, a 5K, and four marathon relay divisions. The first 500 individuals who register will benefit from discounted entry fees and secure spots in the landmark race weekend festivities.
Highlighting Elite Competition with the Colorado Half Marathon Showdown
Another exciting aspect of the 2026 race weekend is the anticipated return of the Colorado Half Marathon Showdown. Introduced in the 2025 race, this initiative aims to bolster the profiles of elite runners who reside and train in Colorado. Male and female competitors will contend for cash prizes totaling approximately $25,000, reaffirming the event’s status as a significant draw for professional runners.
“Over the many years as title sponsor, we’ve been fortunate to bear witness to the remarkable impact the Denver Colfax Marathon has had on both participants and the community at large,” noted Brett Winingham, market growth leader for Cigna Healthcare Mountain States. “Whether you are in a relay race, the full marathon, or just there to cheer on a loved one running in an event, there is truly something in it for everyone. We look forward to being part of this 20th race weekend and continuing to support the health and vitality of the people we serve.”
Community Impact and Charity Involvement
Over the last two decades, the Denver Colfax Marathon has welcomed hundreds of thousands of runners to the scenic Mile High City, collectively covering an impressive 3 million miles. The marathon has collaborated with over 700 charities through its Charity Partners Program, one of the most extensive nonprofit platforms in the nation. This initiative has generated around $10 million in financial support for local charities, assisting them in raising awareness and funds to further their missions.
This remarkable engagement with the community underscores the marathon’s commitment not only to athleticism but also to social responsibility, making it a cornerstone event in Denver.
Recognized As a Premier Event
The Denver Colfax Marathon’s race weekend is celebrated as the largest in the Rocky Mountain Region, ranking amongst the top 25 marathon weekends in the United States. With the expectation of more than 25,000 participants for its 20th anniversary in 2026, this event promises to be a highlight of the year for both local and visiting runners alike.
For those interested in participating in this milestone event, registration is currently available at www.runcolfax.org. Act quickly to secure your spot in a celebration that honors a vibrant running history and community engagement in Denver.
The Denver Colfax Marathon serves as an inspiring example of what can be achieved when a community comes together through sports. Whether you are a seasoned marathoner or a first-time participant, the journey of training and competing remains a source of motivation for many, creating unforgettable memories along the way.
