Fat Ox Endurance Runs
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About the race
Fat Ox Endurance Runs is a multi-day endurance event held November 20–22, 2026 at Estrella Mountain Regional Park in Goodyear, Arizona. The event features both fixed-time and fixed-distance ultrarunning formats on a certified loop course and hosts the 2026 USATF 24-Hour Championship.
Distances offered include:
- 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
- 100K fixed distance
- 50K fixed distance
All events use a USATF certified 0.988178 mile concrete loop around the park turf area. The loop gains about 6 feet of elevation per lap and reaches a maximum elevation of 923 feet. The course is marked with cones and flagging and has timing mats on each lap. A fully staffed aid station operates on course 24 hours with prepared meals and staple items, plus a separate water refill station opposite the main aid area. The venue has no permanent course lighting; runners planning overnight laps should bring personal lighting.
Additional on-site details: a $10 per car per day park entry fee; Maricopa County charges a nightly camping fee and a camping area is located about 400 feet from the course. An onsite EMT service is provided. The USATF championship requires a valid USATF membership and may include formal drug testing. A $4,000 prize purse is allocated to top Men and Women finishers in the championship. Visit the organization's website for the most recent information.
