The Mammoth at Dinosaur Valley
Glen Rose, United States • 11-12 Oct 2025
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.