Fat Ox Endurance Runs
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Fat Ox Endurance Runs, Estrella Mountain Regional Park
Fat Ox Endurance Runs is scheduled for November 20 to 22, 2026 at Estrella Mountain Regional Park in Goodyear, Arizona. The event includes both fixed time events and fixed distance races and will host the USATF 24 Hour Championship on November 21, 2026. A valid USATF membership is required to compete in the championship and athletes may be subject to formal drug testing.
Distances and formats
- 48 Hour
- 24 Hour
- 12 Hour
- 6 Hour
- 100 Mile
- 100K
- 50K
All races use a USATF certified 0.988178 mile concrete loop around the Turf Picnic area. The loop records about 6 feet of elevation gain per lap and a maximum elevation of 923 feet. A fully stocked on course aid station is available 24 hours with a separate water refill station on the opposite side of the loop. Typical aid items include peanut butter and jelly sandwiches, bean roll ups, cookies, candies, coffee, soda and sports drinks.
Pacers are not permitted. Crew access and personal drop bags are provided near the course; for the USATF championship crew tents must remain within 100 meters of either side of the main aid station. There are no course lights at this venue so runners going through the night should bring a headlamp or flashlight. Race timing is chip based and finishers receive awards with a custom race buckle for the 100 Mile finishers. Parking requires a $10 per car per day park entry fee and Maricopa County charges a $15 nightly camping fee. Tent and cot rentals are available on site. An onsite EMT will be present for the duration of the event. Visit the organization's website for the most recent information.
