4 Fore 30 Infinity Backyard Ultra

Event overview

The 4 Fore 30 Infinity Backyard Ultra takes place on November 15, 2025 in Macks Creek, Missouri (480 Kissick Way). This is the eighth running of the event. Proceeds support the Kids' Harbor Child Advocacy Center; 100% of race profits go to that organization. Registration pricing is $100 through October 15, 2025 and $115 from October 16 until race day. Registration closes on November 13. There is no current cap on race size. There are nearby lodging options including Old Kinderhook Lodge and the Sleep Inn in Camdenton.

Format and logistics

The event follows the Backyard Ultra format and rules. Each loop is 4.1667 miles (4 miles 880 feet / 6.7056 km). Runners must complete each loop within one hour; each loop starts at the top of the hour and the process repeats until only one runner completes a loop more than all others. Key rules include no late starts, no leaving the course during a loop except for restrooms, no personal aid during a loop (common aid stations are allowed), no artificial aids, and slower runners must allow passes. An aid station will be located near the start-finish and will be passed on every lap; aid station food and limited concession items will be available. The start-finish area and much of the course will be lit; field lights will be used and runners planning night running are advised to carry a headlamp or flashlight. There are no refunds, but bib transfers are allowed until November 1. Visit the organization's website for the most recent information.