Denver Colfax Marathon Celebrates 20th Anniversary

More than 27,000 runners expected to participate in the annual event featuring a marathon, half marathon, and other races.

Apr. 17, 2026 at 2:10pm

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A fragmented, geometric painting in bold colors depicting runners, landmarks, and the Denver skyline, capturing the dynamic spirit of the city's largest marathon.

A cubist interpretation of the energy and landmarks of the Denver Colfax Marathon, one of the region's most anticipated annual running events.Denver Today

The 20th annual Denver Colfax Marathon is set to take place on May 16-17, 2026, with over 27,000 runners expected to participate in the event's various races, including a marathon, half marathon, 10-miler, 5K, and marathon relay. The race medals will feature iconic Denver landmarks like the downtown clocktower, Empower Field, and Elitch Gardens.

Why it matters

The Denver Colfax Marathon is the largest running event in the city, drawing thousands of participants from across the region. It serves as a Boston Marathon qualifier and highlights Denver's unique geography and landmarks, making it a source of pride and excitement for the local community.

The details

The Denver Colfax Marathon will feature eight different races over two days, including a full marathon, half marathon, 10-miler, 5K, and the nation's largest marathon relay. The race medals will showcase iconic Denver landmarks like the downtown clocktower, Bucky from Empower Field at Mile High, the Twister III roller coaster and ferris wheel at Elitch Gardens, the Denver Zoo, and the dancing statues of Sculpture Park. The medals also come with a built-in stand for display.

The 20th annual Denver Colfax Marathon will take place on May 16-17, 2026.
The full marathon medal features landmarks from downtown Denver, Empower Field, and Elitch Gardens.

The players