2025 Denver Colfax Marathon Registration Now Open

Registration Opens For the 2025 Denver Colfax Marathon Weekend 

First 500 Runners to Sign Up Receive the Best Prices of the Race Season 

DENVER, CO (August 21, 2024) – Registration is now open for the 2025 Denver Colfax Marathon, presented by Cigna Healthcare. The city’s only marathon weekend will take place May 16-18, 2025. The first 500 runners to sign up for a race will receive the lowest prices of the season, saving up to $80 on registration fees.  

“We had a historic 25,000 runners participate this past year in our marathon weekend, and we can’t wait to welcome them back next year,” said Andrea Dowdy, CEO of the Denver Colfax Marathon. “Our race weekend has become a huge community event, it’s truly one of a kind. Whether you’re looking to achieve your goal of running at a mile high or running to support your favorite Colorado charity, we are here to cheer you on and give you an incredible experience.” 

The Denver Colfax Marathon is now the largest marathon weekend in the 8 state Rocky Mountain Region. The race weekend features eight races over two days: A Saturday morning 5K, followed by the marathon, marathon relay (four divisions), half marathon and urban 10 miler on Sunday.  

Each racecourse is carefully crafted to showcase the best scenery that Denver has to offer. From famous city landmarks to the majestic mountain views, and a lakeside start line and finish line, the courses give runners an unbeatable mile high experience. 

The 2025 marathon weekend is expected to welcome over 25,000 runners and more than 100,000 people to the city next May. It’s one of the top 25 largest marathon weekends in the country and the biggest running event in Denver every year. To register for a race, visit www.runcolfax.org.