Backyard Ultra - Summit Trail Racing

Backyard Ultra - Summit Trail Racing, in Marble Falls, TX, is a Last Person Standing ultramarathon inspired by Lazarus Lake. Runners complete a 4.1667-mile loop each hour, returning to the start within 60 minutes as long as more finishers remain. The day loop is a flat, wide 2.08-mile trail run twice to form the hourly loop; the night loop combines trail and road.

Aid is provided at the start/finish, and crew access is allowed with primitive camping or RV parking. No pacers are allowed. The race includes an automatic spot on the 2026 US Backyard Ultra National Team. Visit the organization's website for the most recent information.