A backyard ultra is a last-person-standing race: every competitor starts a 4.167-mile loop, called a yard, at the top of each hour and must finish it inside that hour to stay in. There is no fixed finish — the race ends when one runner completes a yard nobody else completes, and that runner is the only official finisher. Big Dog’s Backyard Ultra at Bell Buckle, Tennessee is the original, run since 2011 on Gary ‘Lazarus Lake’ Cantrell’s own land, and it sits at the top of the format’s qualifying ladder.
2026 is a World Team Championship year, which the event alternates with individual World Championship years. Racing starts at 7:00 a.m. on Saturday 17 October 2026 on the property’s trail day loop, with 450 feet of gain, switching to an asphalt night loop with 90 feet of gain after dark. Each yard completed by a team member scores one point for that country, and the nation with the most points takes the world team title. There is no scheduled cutoff; the 2023 edition ran 108 hours.
There is no open entry. Team USA is a field of 15: six winners of Silver Ticket events plus nine top at-large performers over a qualifying period running from 16 August 2024 to 15 August 2026, and entrants must be US citizens or permanent residents. Athletes who have equalled or exceeded 100 hours may apply at large. Registration closed on 1 September 2026. The entry fee was $250 early and $300 late. The format’s global rules apply: no pacers, no non-competitors on the course, and no personal aid during a yard.
A backyard ultra is a last-person-standing race in which every competitor starts a loop — a yard — at the top of each hour and must complete it inside that hour to stay in the race. The official rules fix the yard at 4 miles 880 feet, or 4.167 miles, so 24 yards equals exactly 100 miles. All remaining runners must be inside a starting corral at the bell, with warnings at three, two and one minute; there are no late starts, no personal aid during a yard, and no leaving the course mid-yard except for restroom breaks. There is no fixed finish. The race ends when one runner completes a yard that nobody else completes, and that runner is the only official finisher — every other entrant, including the runner who lasted second longest, is recorded as a DNF, and if nobody completes an extra yard alone there is no winner at all. The format was created by Gary ‘Lazarus Lake’ Cantrell, co-founder of the Barkley Marathons, who has run the original race on his own land at Bell Buckle, Tennessee since 2011. Races elsewhere become official affiliate, or satellite, backyard ultras by applying to the organisation and running the standard yard distance, corral and hourly-bell rules; affiliation places a race on the official list and plugs it into the qualifying ladder that feeds the championship. Each affiliate race is organised independently by its own local race director, who sets the entry fee, handles registration and runs the event. Big Dog’s Backyard Ultra at Bell Buckle sits at the top of that ladder and alternates by year between an individual World Championship and a World Team Championship, in which each nation fields a team and every yard completed by a team member scores a point for that country.
