Antelope Island 50K

Antelope Island 50K takes place in Syracuse, Utah, on October 10, 2026, on the trails of Antelope Island in the Great Salt Lake. Buffalo Run Adventures offers two formats: the 50K (31 miles) starting at 8:00 a.m. and a half marathon (13.1 miles) starting one hour later at 9:00 a.m.

Island trail running in October is a good deal for anyone chasing a first ultra: the 50K is the classic entry-level ultra distance, and a morning start leaves you the full day to finish comfortably. The half marathon suits runners who want the same scenery over a distance they can race harder. For the 50K, a 16-week plan with long runs reaching 20 to 24 miles, one session of hills per week and a habit of eating on the move will carry you through. For the half, 10 to 12 weeks with a long run building to 12 miles is enough. In either case, practice on open, exposed terrain, carry water, and think about sun protection, since island trails offer little shade.