November 22-24, 2024

2025 Live Results

https://www.usatf.org/events/2024/2024-usatf-24-hour-road-championships

Fat Ox Endurance Runs

Estrella Mountain Regional Park
Goodyear, AZ

We are excited to announce that the 2024 Fat Ox Endurance Runs will again host the USATF 24-Hour Championship on November 23, 2024!

What started as an ‘ultra-experiment’ for young Nathan Coury’s college thesis on “fat oxidation” (fat-ox) and ultra running, becomes a 48 hour family fixed-time festival celebrating our season at Nardini Manor. Note we’ve moved venues to Estrella Mountain Regional Park

Run your own experiment and push beyond your limits on the USATF Certified 0.988178 mile course. It’s perfect for your first ultra, your first 100 mile, or your own personal best; a 48 hour time limit to discover your inner animal!

Register

Volunteer

Event Location

Estrella Mountain Regional Park
14805 W Vineyard Ave
Goodyear, AZ 85338

Directions

Located in the southwest corner of the Phoenix metropolitan area, Estrella Mountain Regional Park both borders the Gila River and contains the northernmost part of the Sierra Estrella range for which it is named. Originally home to the Hohokam, followed by the Pima and Maricopa tribes, it was established as a park in 1954. It comprises 19,840 acres, and is administered by Maricopa County Parks and Recreation.

Start Times

Friday, November 22
8:00 AM – 48 Hour / 24 Hour / 12 Hour / 6 Hour Start
9:00 AM – 100 Mile Race Start (Starts 312 meters on course)
2:00 PM – 6 Hour Afternoon Start
5:24 PM – Sunset
8:00 PM – 12 Hour / 6 Hour Evening Start

Saturday, November 23
8:00 AM – *USATF 24 Hour Championship / 24 Hour / 12 Hour / 6 Hour Start
8:30 AM – 100K Race Start
9:00 AM – 50 Mile Race Start
9:30 AM – 50K Race Start
2:00 PM – 6 Hour Afternoon Start
8:00 PM – 12 Hour / 6 Hour Evening Start

Bib Pickup

Estrella Mountain Regional Park
Turf Picnic Area

Friday, November 22
7:00 AM – Packet pickup/race day registration begin

Saturday, November 23
7:00 AM – Packet pickup/race day registration begin

Volunteer

We need help to make Fat Ox possible. Volunteer perks include Aravaipa race credits and race swag!

Volunteer Now

Race Perks

Gender cut long sleeve shirt

Chip timed race results

USATF Certified Course

Well stocked aid station

Finisher Award (custom race buckle for 100 Mile, 200 Mile)

Live Tracking

Follow the 2024 Fat Ox Endurance Run with live split points throughout the race.

Aravaipa Live

Register Now

Registration closes: Mon, Nov 18 @ 11:59PM MT

Race Registration

	Until 6/30	Until 10/20	Until 11/18
48 Hour	$260.00	$290.00	$320.00
24 Hour	$190.00	$220.00	$250.00
12 Hour	$140.00	$155.00	$170.00
6 Hour	$100.00	$115.00	$130.00
100 Mile	$220.00	$240.00	$260.00
100K	$150.00	$170.00	$190.00
50 Mile	$130.00	$145.00	$160.00
50K	$115.00	$125.00	$135.00

*Prices DO NOT include City of Goodyear taxes

All prices are before tax and Ultrasignup fees (if applicable).
Save $7.5 with our no-shirt option!

Course Information

Key Stats

Date | November 22-24, 2025

Loop Distance | 0.988178 Miles

Total Elevation Gain | 6 feet per loop

Max Elevation | 923 feet

Course Map

Short Course Event Details

All distances at Fat Ox Endurance Runs will be held on a .98 mile concrete loop which circumnavigates the Turf Picnic area at Estrella Mountain Regional Park.

We’ll have a fully stocked aid station directly on course, which runners will pass once per loop, as well as a water refill station on the opposite end of the course.

The course will be easy to follow with cones and flagging to ensure you stay on the correct path. Unlike Nardini, there are not lights at this venue, so runners who plan to go through the night will need to bring either a flashlight, headlamp or both to light your way around the course at night.

We’ll have a fully stocked aid station directly on course and you can setup trackside for ultimate convenience. we host a fully stocked aid station 24 hours a day. We will prepare breakfast, lunch, and dinner each day in addition to having many of the traditional staple items available at all our events. Staple items include peanut butter & jelly sandwiches, bean roll-ups, cookies, candies, coffee, soda and sports drinks.

Estrella Mountain Regional Park is located in the Southwest area of the Phoenix Metro area set against the backdrop of the Estrella Mountain Range. The course will utilize the newly built 1 mile walking path around the grass turf area in the park surrounded by picnic Ramadas.

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 table, chairs and pop up next to the course for no charge. Camping will be an additional fee due to Maricopa County Park Regulations located approximately 400 feet from the course in an overflow dirt lot.

The 2024 Fat Ox Endurance Runs is pleased to host the USATF 24-Hour Championships. This will take place on on the USATF Certified 0.988178 mile course.

In order to compete, one must have a valid USATF Membership for 2024 or 2025.

NOTE: Athletes who participate in this competition may be subject to formal drug testing in accordance with USATF and World Athletics rules, in accordance with USOPC, USADA, or WA procedures. Athletes found, after a disciplinary hearing, to be positive for prohibited substances, as defined by the WADA Code, WA and/or AIU, or who refuse to be tested, will be disqualified from this Event and may lose eligibility for future competitions. Any prize money payable to an athlete who has tested positive shall be withheld until the final disposition of all disciplinary proceedings.

BEWARE: Some prescriptions, over the counter medications, and nutritional supplements may contain prohibited substances. Information regarding drugs and drug testing may be obtained by calling the USADA Reference Hotline at 719-785-2000 or www.usantidoping.org.

We will have a $4,000 prize purse for the top Men & Women finishers: 1st Place Man & Woman: $ 1,200 2nd Place Man & Woman: $ 500 3rd Place Man & Woman: $ 300

*USATF Championship Rules can be found HERE

In order to be eligible for results in the USATF National Championship, awards & prize money you must be a current USATF member and a United States Citizen.

Prize money will be given out to the top 3 Men and Women athletes equally as follows:
1st - $1,200
2nd - $500
3rd - $300

The winner of the 2024 U.S. National 24-Hour Championship, if contested, will receive automatic selection to the 2025 World Championship, providing the runner achieves the minimum distance of

Male: 145 miles (233.348 km)

Female: 130 miles (209.209 km)

The website with the 2025 24H US Team Qualifying Standards can be found at 2025 U.S. National 24 Hour Qualification Standards and List of Current Qualifiers | USA Track & Field (usatf.org).

USATF awards will be as follows (possibly mention this under awards on your website:

Top 10 male and top 10 female runners overall receive medals (regardless of age)
For masters in 5 year increments starting with 40-44, 45-49, 50-54, 55-59, etc. awards will be for 1^st, 2^nd, 3^rd in each age group, male and female.
It is possible for a masters runner to place both in the overall award category as well as their masters age group, this double dipping

Sights and Sounds of the 2022 Fat Ox Endurance Runs

Additional Race Info

Forecast for Goodyear, AZ

Here's what you can expect for the average weather in Goodyear, AZ at Fat Ox:

Temperatures:
Highs: Around 70-75 degrees Fahrenheit (21-24 degrees Celsius)
Lows: Around 50-55 degrees Fahrenheit (10-13 degrees Celsius)

Precipitation
November is typically a dry month in Phoenix, with minimal rainfall.

Expect pleasant daytime temperatures with cool evenings. Layers are recommended to adjust to the temperature changes and be prepared for the possibility of rain.

Race Day Schedule
Please arrive early to park, check in and warm up prior to your run. Restroom facilities are located along the course just west of the start/finish area.

Timeline

Friday, November 22
6:30 AM – Estrella Park Opens for Setup
6:41 AM – Begin civil twilight
7:00 AM – Packet pickup/race day registration begin
7:07AM – Sunrise
8:00 AM – 48 Hour / 24 Hour / 12 Hour / 6 Hour Start
9:00 AM – 100 Mile Race Start (Starts 312 meters on course)
2:00 PM – 6 Hour Afternoon Start
5:24 PM – Sunset
5:51 PM – End Civil Twilight
8:00 PM – 12 Hour / 6 Hour Evening Start
Moon Phase: Waning Gibbous
Illumination: 56%

Saturday, November 23
6:42 AM – Begin civil twilight
7:08 AM – Sunrise
7:00 AM – Packet pickup/race day registration begin
8:00 AM – *USATF 24 Hour Championship / 24 Hour / 12 Hour / 6 Hour Start
8:30 AM – 100K Race Start
9:00 AM – 50 Mile Race Start
9:30 AM – 50K Race Start
2:00 PM – 6 Hour Afternoon Start
5:24 PM – Sunset
5:50 PM – End Civil Twilight
8:00 PM – 12 Hour / 6 Hour Evening Start
Moon Phase: Last Quarter
Illumination: 46%

Sunday, November 24
6:42 AM – Begin civil twilight
7:09 AM – Sunrise
8:00 AM – All Races End
8:30 AM – Awards (Fixed Time Events; Fixed Distance Awards & Podiums will be celebrated at the conclusion of that specific race)
9:00 AM – Breakdown/Camp Checkout

Location
Estrella Mountain Regional Park is located in the Southwest area of the Phoenix Metro area set against the backdrop of the Estrella Mountain Range. The course will utilize the newly built 1 mile walking path around the grass turf area in the park surrounded by picnic Ramadas.

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 table, chairs and pop up next to the course for no charge. Camping will be an additional fee due to Maricopa County Park Regulations located approximately 400 feet from the course in an overflow dirt lot.

Course Marking / Lighting
The course will be easy to follow with cones and flagging to ensure you stay on the correct path. Unlike Nardini, there are not lights at this venue, so you will need to bring either a flashlight, headlamp or both to light your way around the course at night.

We are excited to offer several camping and tent rental options at Fat Ox. Maricopa County Regional Parks does have a nightly camping fee which we will post more details on soon. Camping will be available Friday & Saturday nights.

The camping area opens Friday, (Race Day) at 6:30 AM for camping setup. Campers have the option to set up their tents in a specified area approximately 400 feet from the race course. The park has moved our camping area slightly away from the course.

Tent and cot rentals will be available for your convenience. These will be located at a camping area approximately 400 feet from the course. You may reserve a tent and/or cot when you register.

All rentals will be setup when you arrive. You may check in to receive your tent anytime after 7:00 AM on Friday. Tents will reserved on a first come, first served basis.

Large Tent – $65 – These are 8 feet by 12 feet and are large enough to stand up in (for most people) and may also fit two cot rentals.

Large Tent + 1 Cot – $85

Large Tent + 2 Cots – $105

Restrooms are located on the property and available for use by runners throughout the event.

Start time are posted above and start promptly on time. If you arrive late for the start of your race you may still compete, but the time you’ve missed is lost and cannot be made up.

A pre-race meeting will take place 5 minutes before each event. At the start, you will begin circling the loop counter clockwise. Thereafter, you will change direction every six hours (at 2:00 PM, 8:00 PM, 2:00 AM, 8:00 AM, etc).

You may leave the course at any time. If and when you decide to continue, you must return to the course at the exact same place you left it, and complete the lap you were on when you stepped off the track, in the same direction as you were going, regardless of the direction other runners are moving when you return. This ensures that you are credited with the correct number of laps.

There are no DNFs in any of the multi-day runs and no drop-downs allowed. The objective in the multi-day runs is only to go as far as you can (or desire) in the allotted time. Of course, the more time you spend moving forward, the more distance you will accumulate.

If you wish to stop completely before the official end of your race, inform the race director or timing personnel, that you are quitting or leaving early and remember to turn in your chip!

An awards ceremony will follow shortly after the conclusion for all events at 8:30 AM on the last morning.

NO CUTTING THE CURVES. You must STAY OUTSIDE the cones or markers on the curves. The Estrella Mountain course is on a paved sidewalk. You may not cut the inside curve of the course, however there are a couple of stretches on the outside of the course that are dirt which you may run on. Nonetheless, if you cut the curves you will be disqualified.

It is your responsibility to know the rules. They exist to provide a good experience for all runners. If you are caught cheating you will be asked to leave and will not be allowed at future Aravaipa Running events.

Course etiquette does not require lone runners to yield the inside lane to runners wanting to pass, regardless of whether the one being passed is running or walking at the time. It is assumed that each participant is there to do his or her best, and has an equal right to pursue personal goals. In a race of this type, it is to be expected that even the best will walk for periods of time, particularly those in the longer races. Always pass others on the outside if they are on the inside lane.

An exception to this policy is the case of two or more persons running or walking together. Persons traveling around the trail in groups should always leave an inside channel open so faster runners do not have to travel far to the outside to get around them.

In all cases, remember to show common courtesy, and that most of us run for the enjoyment and thrill of the experience.

Trash
Please respect Estrella Mountain Regional Park by disposing of any trash at our aid station or designated receptacles in the recreation area.

Results & Photos

Course Records

100 Mile
Female - Camille Herron (2022)- 12:41:10 | Male – Shad Mika (2023) - 18:25:03

100 KM
New in 2024

50 Mile
Female - Faith Shelton (2023) - 13:48:06 | Male - Tim Suan (2023) - 10:27:43

50 KM
Female - Christina Austin (2023) - 6:05:03 | Male - Michael Calcinari (2023) - 7:18:12

48 Hour
Female – Jess Mullen (2022) - 157.1 Miles | Male – Jerry Hughes (2022) - 228.2 Miles

24 Hour
Female – Sierra Degroff (2023) - 112.49 Miles | Male – Don Reichelt (2023) - 127.12 Miles

12 Hour
Female – Rachel Mlsna (2018) - 68.7 Miles | Male – Eric Ebele (2021) - 61.2 Miles

6 Hour
Female – Allyssa Jones (2023) - 39.5 Miles | Male – Joshua Locke (2019) - 40.5 Miles

November 22-24, 2024

Fat Ox Endurance Runs

Event Location

Start Times

Bib Pickup

Volunteer

Race Perks

Live Tracking

Race Registration

Course Information

Estrella Mountain Regional Park 1-Mile Loop (24 Hour USATF National Championship)

Sights and Sounds of the 2022 Fat Ox Endurance Runs

Additional Race Info

Results & Photos

Estrella Mountain Regional Park 1-Mile Loop
(24 Hour USATF National Championship)