Fat Ox

The Fat Ox Endurance Runs, held November 21-23, 2025, take place at Estrella Mountain Regional Park in Goodyear, Arizona. This ultra-running event features multiple race options including 48-hour, 24-hour, 12-hour, and 6-hour fixed-time runs, as well as fixed-distance races of 100 miles, 100K, 50 miles, and 50K. The course is a USATF-certified 0.988-mile loop around the park’s turf area, offering a flat, scenic route with the Estrella foothills as a backdrop.

The event hosts the USATF 24-Hour National Championship and provides well-stocked aid stations, live tracking, and camping options nearby. Awards and prize money are offered for top finishers. Visit the organization's website for the most recent information.