The Mammoth 2026 – 100K / 50K / 25K / 10K / 5K and Mighty Mammoth 1K Fun Run – Glen Rose, TX 2026

Get ready for The Mammoth Race Glen Rose FALL migration. This multi-distance trail run welcomes families and runners of all skill levels. Enjoy the Hill Country that surrounds this stunning ONE THOUSAND acre ranch. We can't wait to see you out there! The Mammoth - Glen Rose, TX 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 3.5-mile loop and a 7-mile loop. Both loops combined equal a 10.5 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: the main lodge at the starting line, and Matazamo ranch house. Aid stations are approximately 3.5 miles apart. RACE CATEGORIES: 100K - 26hr Cut-off time 50K 25K 10K 5K Mighty Mammoth 1K Fun Run - NON-CHIP TIMED EVENT . RACE HIGHLIGHTS