Fat Ox Endurance Runs
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Fat Ox Endurance Runs - Estrella Mountain Regional Park
The Fat Ox Endurance Runs take place November 20–22, 2026, at Estrella Mountain Regional Park in Goodyear, AZ. The event offers fixed-time and fixed-distance running options on a USATF certified 0.988178 mile loop with about 6 feet of elevation gain per lap and a maximum site elevation of 923 feet.
Distances and formats include:
- 48 Hour fixed-time event
- 24 Hour fixed-time event and USATF 24 Hour Championship
- 12 Hour fixed-time event
- 6 Hour fixed-time event
- 100 Mile fixed distance
- 100K fixed distance
- 50K fixed distance
The course is a paved concrete loop that circles the Turf Picnic area. It is marked with cones and flagging, and timing mats register each lap. A fully stocked aid station is located on course and operates around the clock, with prepared meals and staple items such as peanut butter and jelly sandwiches, cookies, coffee, soda, and sports drinks. A separate water refill station is available on the opposite side of the loop.
Pacers are not permitted. Crews and personal drop bags are allowed in a designated area near the course; USATF championship crews must remain within 100 meters of the main aid station. Camping and parking are subject to Maricopa County park regulations, including a per car entry fee at the park gate. An onsite EMT from MedStar Solutions will provide medical coverage for the event. Prize money and awards are offered for the USATF 24 Hour Championship and for top finishers in each race category. Athletes competing in the USATF championship must hold valid USATF membership and may be subject to drug testing under USATF rules. Visit the organization's website for the most recent information.
