November 17 - 19, 2023

Fat Ox

14805 W. Vineyard Avenue

Buckeye, AZ 100 Mile, 100K, 50 Miler, 50K, 48hrs, 24hrs, 12hrs, 6hrs, USATF 24HR

Registration closes: Mon, Nov 13 @ 11:59PM MT


The coolest of the fixed time series, the Fat Ox returns with a new venue at Estrella Mountain Regional Park for a 48-hour run fest! Participants choose between the 48, 24, 12, or 6 Hour, 100 miler, 100K, 50 miler, or 50K all on a 0.988178 mile certified loop! Run all day and night on this sidewalk path that winds around the turf area of Estrella Mountain Regional Park with the Estrella foothills as a backdrop.

Course Video


The start / finish line will be located near Ramadas 8 & 9 on the East side of the Turf area at the Estrella Mountain Regional Park. The Aid Station tent will be easily accessible right on the course. The timing tent will be just North of the Aid Station with timing mats that you must cross each loop. You can setup your own pop-up tents, tables, chairs and aid right along the loop.

Camping will be an additional fee (details coming).

Race Information

Anything else you may need to know is located on the Fat Ox website! Information on the website includes: course information, race day schedule, crew information, race perks, and more.

Race entries are non-refundable and non-transferable. For other options, please check out our Race Withdrawal Policy.

Nardini Series

NOTE: The series registration is not open just yet (as of 3/15/23).
Become a fixed-time master with two opportunities to push beyond your limits on the 500 meter track at Nardini Manor and once at Estrella Mountain Regional Parks Turf Area!

Warm up with the hottest fixed-time race starting in June with the Hotfoot Hamster 24 Hour.

Vibe and party all night with miles of shenanigans at the Jackrabbit Jubilee 12 Hour in August.

And celebrate some winter fixed-time fun at the Fat Ox 48 Hour in November.

Do all three and piece together a treasure token reserved for those who tread thrice at Nardini!

Register early for the series that leads to the biggest New Year's celebration in fixed-time racing, Across the Years, and save by choosing one of the six series options below. Hotfoot Hamster runners! Run Nardini again and again for 2023 and return for the Jackrabbit Jubilee in August and the Fat Ox 48 Hour in November

Add on and save up to 15%!

Register for the entire series here: Nardini Series

Event's current local time: 8:09 PM MT


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