American Heroes Run

The Flat and the Furious trail run at Barr Lake State Park in Brighton, CO offers a 30K and 15K race on a flat and fast course with stunning lake views and minimal elevation gain. The event, part of the Endurance Race Series, takes place on July 14, 2024, starting and finishing at the Nature Center...

The Flat and the Furious trail run at Barr Lake State Park in Brighton, CO offers a 30K and 15K race on a flat and fast course with stunning lake views and minimal elevation gain. The event, part of the Endurance Race Series, takes place on July 14, 2024, starting and finishing at the Nature Center...

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 Calarat Challenge Trail Running Festival takes place over Labor Day weekend and offers a variety of trail running events, including a 1/2 marathon, 10K, 5K, and Kids 1K. The races start and finish at the Cal-Wood Education Center, running through the beautiful private properties of Cal-Wood and ..