The Colfax Marathon Relay splits the full 26.2-mile marathon course into 5 legs for teams of 5 runners. Each runner covers 4–6 miles, making the marathon distance accessible to everyone.

The relay is wildly popular with corporate teams, running clubs, and friend groups. Exchange zones are at designated points along the course with team gathering areas, hydration, and cheering sections.

Altitude Advisory: At 5,280 feet, oxygen levels are about 17% lower than at sea level. Arrive 2–3 days early, increase water intake by 50%, and start conservatively.

Ready to Run?

Registration for the 2026 Denver Colfax Marathon is open.