4 Fore 30 Infinity Backyard Ultra

The 4 Fore 30 Infinity Backyard Ultra is an annual endurance running event held in Macks Creek, Missouri, now in its eighth year. Participants run a 4.1667-mile course every hour, starting at 7:00 AM, with the goal of being the last person to complete a loop. The race continues until only one runner remains able to finish each hour within the time limit.

The event follows the rules of Big's Backyard Ultra, emphasizing self-paced running and strategic pacing. All runners receive race swag, and proceeds benefit the Kids' Harbor Child Advocacy Center. The race features aid stations, optional lighting, and accommodations nearby. Visit the organization's website for the most recent information.