Colorado 13er (Half Marathon/10k/5k) 2027

The Colorado 13er begins at the Home Depot on Dillon Road in Louisville, Colorado, offering a 13.1-mile half marathon, a 10k, and a 5k on the same race morning. The half marathon starts at 6:30 AM MDT, with the 10k and 5k following at 6:40 AM MDT. Runners aged 14 and older are eligible to participate. The half marathon follows a loop through Louisville, featuring views of the Flatirons. Nine miles of the course consist of flat, crushed gravel, positioning it between trail running and road racing, distinct from a pure pavement event. The 13.1-mile course includes 10 water station stops and 5 portable toilet stops. All race distances are mechanically measured. Half marathon finishers will receive a 13.1 medal, and approximately 30 percent of participants report this as their first race.