Calarat Challenge Trail Running Festival

The Dirt Circus Boulder is a free community event organized by UltraSignup to celebrate local races and race directors in Boulder, Colorado. The one-day festival includes a social run with options for a 5K route or a longer distance, food, raffles with prizes, brand expos, and social connections. Th..

Participants can join the 12th Annual Race Standley Lake event in Westminster on August 24, 2024, offering 13.1, 10K, and 5K distances suitable for competitive, intermediate, or novice runners. The course features a mix of packed dirt trails, single track, and some minimal bike path, with stunning l..

Front Range Ultra Dayze is a 100-hour ultra-running event in Loveland, CO, featuring distances from 6-hour to 200-mile races. Runners can camp for free at the park throughout the event, creating an epic ultra-running party atmosphere. The course is a flat and fast 2-mile loop with 80% dirt trail and..

The American Heroes Run is a special event held on a beautiful, flat, fast 1.05-mile loop course in Longmont, CO. Participants will receive a high-quality race shirt, and finishers will get a unique event coin. The 100-mile finishers will receive an attractive belt buckle. The event honors the heroe..

The Devil on the Divide trail run takes place on Saturday, September 7, 2024, in Empire, Colorado. Participants can choose between a challenging 50K course with over 6,500 feet of climbing and a 22K course with 3,400 feet of elevation gain. The race offers breathtaking views of Clear Creek County an..

The Nedned Trail Fest will take place in Nederland on Saturday 14 September 2024. You can run between 5 and 21 kilometers.