Big Dog's Backyard Ultra, often referred to as Big's Backyard Ultra, is the original backyard ultra, invented by Gary "Lazarus Lake" Cantrell of Bell Buckle, Tennessee. Participants run a 4.167-mile loop every hour, and are eliminated if they fail to complete a loop in an hour. The path of the loop is on trails during the day and along a road after dark. The distance of each loop is equal to 100 divided by 24, so that a competitor runs 100 miles for a full day of competition. There is no predefined finish. The winner is the competitor who completes a loop that no other competitors complete. If no competitor outlasts every other competitor, there is no winner.
Past results YearWinner LapsAssistNotes2011Tim Englund18Dave Carver2012Joe Fejes28Marcy Beard2013Tim Englund35Keith Knipling2014(no winner)49Johan Steene / Jeremy EbelBoth runners dropped out after 49 loops.2015(race not held)2016Babak Rastgoufard29Andy Pearson2017Guillaume Calmettes59Harvey Lewis2018Johan Steene68Courtney Dauwalter2019Maggie Guterl60William HaywardFirst female winner.2020Courtney Dauwalter68Harvey LewisU.S. winner.2021Harvey Lewis85Chris Roberts2022 Piotr Chadovich76Harvey Lewis2023Harvey Lewis108Ihor VerysWorld record. 2024Scott Snell88Megan EckertFemale world record. 2025 Phil Gore 114 Ivo SteyaertFemale world record.
See also Barkley Marathons
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