Backyard Ultra - Summit Trail Racing
Marble Falls, United States • 22 Nov 2025
Event
Backyard Ultra - Summit Trail Racing takes place on Saturday, Nov 22, 2025, in Marble Falls, TX. The race is an officially sanctioned Backyard Ultra and was selected as one of seven U.S. races offering an automatic spot on the United States Backyard Ultra National Team in 2026. Registration closes on Wed, Nov 19; race swag cutoff is Oct 22, 2025. Cost information notes a $150 price increase effective 9/1/25.
Format and logistics
Participants run repeated loops until only one runner remains. The event uses a loop of 4.1667 miles completed every hour. The day route is a 2.08 mile trail lap; two laps equal the hourly loop. The day loop is described as flat and wide. The night loop combines trail and road.
Rules and support details: runners must return to the start line within 60 minutes (minimum 14:23 min/mile pace). Organizers provide 3-, 2-, and 1-minute warnings before each loop. No pacers are allowed. Crew access is available at the start/finish. Setup is available on Nov 21 at 5pm. Primitive camping and RVs are allowed overnight. Aid at the start/finish includes cold water, ice, orange-flavored Tailwind, and race snacks. Visit the organization's website for the most recent information.