The Mammoth - Glen Rose
Glen Rose, United States • 10-11 Oct 2026
The Mammoth - Glen Rose, TX
The Mammoth Race is a multi-distance trail running event held on High Hope Ranch and Retreat Center in Glen Rose. The course uses two loops : a 3.5 mile loop and a 7 mile loop : which combine to form a 10.5 mile lap. Two on-course aid stations are provided, located at the main lodge and Matazamo ranch house, approximately 3.5 miles apart.
Distances offered:
- 100K Ultra Trail Run (26 hour cut-off)
- 50K Trail Run
- 25K Trail Run
- 10K Trail Run
- 5K Trail Run
- 1K The Mighty Mammoth Fun Run non chip timed
Participants receive official race shirts and finisher medals; the 100K finishers receive finisher buckles. Trails are marked and aid is available around the clock during the event. Overnight tent camping and boondocking are available without hook ups; camping costs $10 per person payable at the gate and sites allow up to six people. Parking and entrance are included in the event price.
Additional event notes include a race day packet pick up on site, a policy that pets are not allowed, an enviro friendly expectation to bring a personal bottle, and a non refundable fee policy with allowed transfers. The event may be altered or canceled for safety reasons and runs rain or shine. Visit the organization's website for the most recent information.