The Mammoth at Dinosaur Valley

OCT
11-12
2025
Read all about the The Mammoth at Dinosaur Valley on 11-12 Oct 2025 in Glen Rose.
11-12 Oct 2025
100 kilometers 50 kilometers 25 kilometers 10 kilometers 5 kilometers

Always double-check with the organizer's website! This page may contain affiliate links.

About the race

The Mammoth at High Hope Ranch and Retreat Center in Glen Rose, Texas is a multi-distance trail race offering 100K, 50K, 25K, 10K, 5K and the Mighty Mammoth 1K Fun Run. The course uses two loop options—a 3.5-mile loop and a 7-mile loop—that together form a 10.5-mile lap through the Hill Country on High Hope Ranch trails. Runners navigate well-marked trails with two aid stations at the starting lodge and Matazamo Ranch House, and there are generous cutoffs including a 26-hour limit for the 100K.

The event is family-friendly with finisher shirts/medals, buckles for 100K, a post-race celebration, and camping options. BYOB, no pets, rain or shine. Visit the organization's website for the most recent information.

100 km
100k Ultra Trail Run
50 km
50k Trail Tun
25 km
25k Trail Run
10 km
10k Trail Run
5 km
5k Trail Run
The Mighty Mammoth 1k Fun Run

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