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 scenic backdrop of the Estrella foothills.
The event hosts the USATF 24-Hour National Championship with prize money for top finishers. Runners enjoy a fully stocked aid station, live tracking, and the option to camp nearby. The course is unlit at night, so participants must bring their own lighting. Visit the organization's website for the most recent information.
Always double-check with the organizer's website – things can change, and we might have sprinted past a few details!
