Colorado 13er (half Marathon/10k/5k)

Experience the ultimate blend of trail running and road racing at the Colorado 13er on Sunday, June 1st, 2025, in Louisville, Boulder. Conquer the scenic 13.1-mile course with stunning views of the Flatirons, tailored for all levels from seasoned athletes to first-time runners. Choose from the half marathon, 10k, or 5k options for a perfect outing with friends and family. Enjoy multiple water stations, gender-specific performance tees, and a finisher medal in a supportive environment with flat crushed gravel paths and free parking. Don't miss this inclusive and rewarding event filled with camaraderie, breathtaking scenery, and a sense of accomplishment!