4 Fore 30 Infinity Backyard Ultra

Event overview

The 4 Fore 30 Infinity Backyard Ultra takes place in Macks Creek, Missouri on November 15, 2025. This is the eighth running of the event. It follows the Backyard Ultra format and lists its race type as Last Man Standing. The event donates 100% of its profits to the Kids' Harbor Child Advocacy Center. Entry fees are $100 through October 15, 2025 and $115 from October 16 until race day. There are no refunds, but bib transfers are allowed through November 1. Several hotels and motels are available a short drive from the course, including Old Kinderhook Lodge and the Sleep Inn in Camdenton. Runners receive race swag and on-course food at the aid station; limited menu items are available from the ballpark concession stand.

Format and rules

The event follows Big's Backyard Ultra rules. Each loop is 4.1667 miles (6.7056 kilometers) and must be completed within one hour to count. Each new loop begins exactly one hour after the previous loop. The winner is the last person to complete a full loop; all others are recorded by distance covered. Key rules include no leaving the course during a loop except for restrooms, no personal aid during a loop while common aid stations are allowed, no artificial aids, and no non-competitors on the course. An aid station sits near the start-finish area and the start-finish area will be lit; runners are advised to carry a headlamp or flashlight for night hours. Timing of individual loops is optional. There is currently no cap on race size. Past editions have lasted multiple hours, for example 38 hours in 2020 and 26 hours in 2024. Visit the organization's website for the most recent information.