Fat Ox Endurance Runs

Event overview

The Fat Ox Endurance Runs take place in late November 2025 at Estrella Mountain Regional Park in Goodyear, Arizona. The event includes fixed-time and fixed-distance endurance events and will host the USATF 24-Hour Championship in 2025. A certified loop course is used and a prize purse is offered for the USATF championship division.

Distances and format

• 48 Hour fixed-time event
• 24 Hour fixed-time event (USATF 24-Hour Championship)
• 12 Hour fixed-time event
• 6 Hour fixed-time event
• 100 Mile fixed-distance race
• 100K fixed-distance race
• 50K fixed-distance race

Course and logistics

The course is a USATF certified 0.988178 mile concrete loop around the park Turf Picnic area with about 6 feet elevation gain per loop. The loop is marked with cones and flagging. There are no venue lights at night, so participants must provide their own lighting. A fully stocked aid station is located on course and is staffed 24 hours, with prepared meals and staple items. Crew access and personal drop bags are allowed in a designated area; pacers are not permitted.

Entry, services and rules

Registration uses tiered pricing. Parking requires a daily park entry fee. Camping options are available with a Maricopa County nightly camping fee; some race nights include camping. An onsite EMT will be present for event medical coverage. To be eligible for USATF championship awards and prize money, athletes must hold a valid USATF membership and meet nationality rules; championship competitors may be subject to formal drug testing. All finishers receive a finisher award and top three male and female performances are awarded in each race. Visit the organization's website for the most recent information.