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The Mammoth 100K - 50K - 25K - 10K - 5K and Mighty Mammoth 1K Fun Run

Sat October 11 - Sun October 12, 2025 Glen Rose, TX 76043 US Directions

Events

100K Ultra Trail Run

$155 10/11 - 10/12 7:00AM CDT - 9:00AM CDT Price increases after July 17, 2025 at 11:59pm CDT

50K Trail Tun

$115 10/11 7:15AM CDT - 7:15PM CDT Price increases after July 17, 2025 at 11:59pm CDT

25K Trail Run

$85 10/11 7:30AM CDT - 1:30PM CDT Price increases after July 17, 2025 at 11:59pm CDT

10K Trail Run

$65 10/11 7:45AM CDT - 10:45AM CDT Price increases after July 17, 2025 at 11:59pm CDT

5K Trail Run

$55 10/11 8:00AM CDT - 11:00AM CDT Price increases after July 17, 2025 at 11:59pm CDT

The Mighty Mammoth 1K Fun Run

$25 10/11 10:00AM CDT - 12:00PM CDT Registration ends October 11, 2025 at 11:59pm CDT
Open to ages 11 and under.
For Pacers Only

Pacers

$0 10/11 7:00AM CDT
If you are pacing the 100K athlete, please click the button below to register

Race Website

Additional race information can be found at https://www.mammothrace.com/.

Place

High Hope Ranch and Retreat Center
Glen Rose, TX US 76043

Description

Get ready for The Mammoth Race inaugural Fall Migration at Hope Ranch! Our multi-distance trail run welcomes families and runners of all skill. Enjoy the Hill Country that surrounds this stunning ONE THOUSAND acre Eco-Retreat. The ranch is dedicated to wildlife habitat protection, biodynamic agriculture and neighbors Fossil Rim Wildlife Center. It is a fantastic way to celebrate the Fall Season. We can't wait to see you out there! 

 

The Mammoth at High Hope Ranch is a multi-distance trail running event located on the trails High Hope Ranch and Eco-Retreat. Distances offered are 100K, 50K, 25K, 10K, 5K and The Mighty Mammoth 1K FUN RUN. There will be two sections of the course: a 3.3-mile loop and a 7-mile loop. Both loops combined equal a 10.3-mile lap. The event will run from 7 am on Saturday morning until 9 am on Sunday morning. The starting line and Main Race Hub will be the main lodge on the Ranch. There are two aid stations on course: Main lodge at the starting line, and Matazamo ranch house. Aid stations are approximately 3.3 miles apart.                                                                                                                                                                                                                                                                                       
RACE CATEGORIES:

  • 100K - 26hr Cut-off time
  • 50K 
  • 25K 
  • 10K 
  • 5K   
  • Mighty Mammoth 1K Fun Run - NON-CHIP TIMED EVENT

RACE HIGHLIGHTS:                                                                                                                                                                                                       

  • Finisher Shirts and Medals
  • Generous Cut Off times - Cut off time for 100K only!
  • Finisher BUCKLES for 100K Ultra
  • Scenic routes through pristine natural landscapes
  • Well-marked trails and 'round the clock aid stations
  • Exclusive sites for tent camping and boondocking (no hook-ups)
  • Post-race celebration. Music, food and refreshments!

ADDITIONAL INFO:

  • PETS ARE NOT ALLOWED. USATF sanctioned event policy does not allow for animals to participate in competitions.
  • The Mammoth is an Enviro-Friendly Event - B.Y.O.B (Bring Your Own Bottle) 

​RAIN or SHINE. In the event of inclement weather that would threaten the safety of the racers, the event or courses may be altered or the event may be delayed or canceled. 

RACE DAY SCHEDULE

  • 100K  -  07:00am
  •   50K  -  07:15am  
  •   25K  -  07:30am
  •   10K  -  07:45am
  •    5K   -  08:00am
  •    1K   -  10:00am

CLASSIC SWAG​

  • All participants will receive a Mammoth Race OFFICIAL Race shirt and a Finisher's Medal. 
  • Finisher BUCKLES for 100K ULTRAS 

AWARDS​

  •  NO PLACE FINISHER AWARDS. BRAGGING RIGHTS ONLY 

PACKET PICK-UP

  • TBD
    ​​

PARKING

  • Price INCLUDES Entrance and Parking

OVERNIGHT CAMPING

  • $10 per Vehicle. NOT included in registration. Max 6 people per site. PAYABLE AT THE GATE

REFUNDS/TRANSFERS

  • Race Entry Fees are NON-REFUNDABLE, however TRANSFERS to another Person, Category or Mammoth Event are allowed.

COURSE MAPS - Coming Soon!

Race Contact Info

If you have any questions about this race, click the button below.

Directions

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