Fat Ox Endurance Runs
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Fat Ox Endurance Runs : Goodyear, AZ
The Fat Ox Endurance Runs take place November 20 to 22, 2026 at Estrella Mountain Regional Park and are organized by Aravaipa Running. The event includes fixed time events and fixed distance races on a USATF certified course.
Distances and formats include:
- 48 Hour
- 24 Hour
- 12 Hour
- 6 Hour
- 100 Mile
- 100K
- 50 Mile
- 50K
All races use a concrete loop that measures 0.988178 miles and gains about 6 feet per lap. The loop circles the Turf Picnic area and is marked with cones and flagging. A fully stocked aid station operates on course 24 hours with breakfast, lunch, dinner, and staple items; a water refill station sits on the opposite side of the loop. Timing mats must be crossed each lap near the aid station.
The 2026 event hosts the USATF 24 Hour Championship. Competing in that championship requires a current USATF membership and athletes may be subject to formal drug testing under USATF and World Athletics rules. Prize money for the championship totals $4,000, split equally among the top three men and top three women.
Pacers are not permitted. Crew access and personal drop bags are allowed with a specified crew area; USATF rules require crew tents to remain within 100 meters of the main aid station for the championship. There are no venue lights overnight so runners should bring headlamps or flashlights. An on site EMT will be present during the event.
Parking at the park requires an entry fee per car and Maricopa County charges a nightly camping fee. Tent and cot rentals are available on site. Visit the organization's website for the most recent information.
