Fat Ox Endurance Runs

Fat Ox Endurance Runs (November 21-23, 2025)

The Fat Ox Endurance Runs take place at Estrella Mountain Regional Park in Goodyear, AZ. The event includes fixed-time and fixed-distance formats and will host the USATF 24-Hour Championship during the weekend. The event offers a total prize purse of $4,000 for the USATF 24-Hour Championship (top three men and women: $1,200 / $500 / $300). Eligibility for USATF championship awards and prize money requires a current USATF membership and United States citizenship. Athletes in the USATF championship may be subject to formal drug testing under applicable rules.

Distances

• 48 Hour fixed-time event
• 24 Hour fixed-time event
• 12 Hour fixed-time event
• 6 Hour fixed-time event
• 100 Mile fixed-distance event
• 100K fixed-distance event
• 50K fixed-distance event

Course, logistics and rules

All events use a USATF-certified loop of 0.988178 miles (concrete sidewalk) around the Turf Picnic area. The loop has about 6 feet of elevation gain per lap and a maximum elevation of 923 feet. A fully stocked aid station is located on course and will operate 24 hours with prepared meals and staple items; a water refill station is on the opposite end of the loop. Timing mats are on each lap at the timing tent north of the aid station. An onsite EMT is provided for the duration of the event. Parking at the park carries a $7 per car per day entry fee.

Pacers are not permitted. Crew access and personal drop bags are allowed in a designated area; for the USATF championship, crew tents must remain within 100 meters of the main aid station. Camping is available for a fee approximately 400 feet from the course. Runners change direction every six hours. Course rules include no cutting inside cones on curves and chip return procedures for those who stop early. Lighting is not provided on course at night; runners should bring personal illumination. Visit the organization's website for the most recent information.

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