24 hours of Elk Basin

24 Hours of Elk Basin is a 24-hour mountain bike and trail running endurance event held at the Elk Basin Recreation Area near Belfry, Montana, on the Montana-Wyoming border. The 2026 edition runs 13-14 June and offers solo, two-person and four-person team formats, plus an 8-hour solo option, on a roughly 9-mile bike loop and 6-mile running loop. Registration includes camping, a catered dinner and breakfast, and event swag.