Double Chubb 50K

The Double Chubb is a trail running event held at West Tyson County Park in Eureka, Missouri, offering 50K, 25K, and 8-mile distances. The race features a relaxed atmosphere with a roughly nine-hour cutoff time and multiple aid stations stocked with standard ultra foods and hydration options. Participants must bring their own water containers as the race is cup-free.

The course includes a first loop cutoff for 50K runners at about four hours. Drop bags are available at the start and finish, and the event supports local trail organizations. The race is organized by the Saint Louis Ultrarunners Group, with registration opening in September 2025. Visit the organization's website for the most recent information.