The Mammoth - Glen Rose
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Event overview
The Mammoth - Glen Rose is a multi-distance trail running event in Glen Rose, Texas, held on October 10-11, 2026 at High Hope Ranch and Retreat Center. Distances offered include:
- 100K
- 50K
- 25K
- 10K
- 5K
- Mighty Mammoth 1K Fun Run (non-chip timed)
The 100K has a 26-hour cut-off. Pacers are permitted for 100K runners.
Course, services and logistics
The course uses two loop sections: a 3.5-mile loop and a 7-mile loop; both loops together form a 10.5-mile lap. The starting line and main race hub are at the ranch main lodge. There are two aid stations on course: the main lodge and Matazamo ranch house; aid stations are approximately 3.5 miles apart.
All participants receive a race shirt and a finisher medal; 100K finishers receive finisher buckles. Packet pick-up is on race day at the site. Parking and entrance are included in the price. Overnight tent camping and boondocking are available for a fee of $10 per person, maximum six people per site, payable at the gate. Pets are not allowed. Entry fees are non-refundable, but transfers to another person, category, or Mammoth event are allowed. The event may be altered, delayed, or canceled in case of hazardous weather. Visit the organization's website for the most recent information.
