Barr Lake Half Marathon

2026

The Barr Lake Half Marathon in Brighton, Colorado takes place in mid-June as part of a multi-distance trail event at Barr Lake State Park. The course consists of two loops totaling 13.1 miles on entirely dirt trails, with just 187 feet of total elevation gain—making this one of the flattest trail half marathons you'll find. The route circles the lake twice, offering continuous water views and glimpses of Colorado's Front Range mountains in the distance. Expect wide, well-maintained trails that feel more like smooth dirt roads than technical singletrack. The course stays relatively close to the water throughout, with three aid stations positioned strategically around each loop. At 5,100 feet elevation, conditions are generally mild, though June temperatures can climb and shade is limited along much of the route. This race suits runners looking for a fast trail time or those wanting to experience trail running without technical challenges. The generous 8+ hour time limit welcomes walkers and back-of-pack runners, while the flat profile and dirt surface appeal to road runners curious about trails. If you prefer variety in terrain or significant elevation change, you might find the course repetitive.