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

Prepare for an unforgettable trail running adventure at The Mammoth Glen Rose, TX, taking place on October 10, 2026, at the stunning High Hope Ranch and Eco-Retreat. This multi-distance event offers challenges for every runner, with distances including a 100K, 50K, 25K, 10K, 5K, and the family-friendly Mighty Mammoth 1K Fun Run. The course winds through a picturesque 1000-acre eco-retreat, featuring scenic routes across pristine natural landscapes of the Texas Hill Country. Expect classic Hill Country trails with varying elevations, natural obstacles, and a mix of sharp, smooth, big, and small rocks, providing a truly engaging experience. The longer distances, such as the 50K and 100K, offer a hilly profile with elevation gains estimated between 2500-7500 feet over 50 miles, ensuring a demanding yet rewarding run.

The Mammoth race is renowned for its well-marked trails and a supportive atmosphere, with "round the clock aid stations" strategically placed approximately every 3.5 miles at the main lodge (start/finish) and Matazamo ranch house. Runners praise the enthusiastic staff and volunteers, ensuring a positive experience. Typical race day conditions in early October bring comfortable highs around 81°F and lows around 54°F, with a low chance of precipitation, offering ideal running weather. As an Enviro-Friendly Event, participants are encouraged to bring their own bottles.

Beyond the trails, The Mammoth offers a vibrant post-race celebration complete with music, food, and refreshments, allowing runners to share their accomplishments. 100K ultra finishers are honored with exclusive buckles, while all participants receive a finisher's medal and race shirt. For those looking to extend their stay, tent camping and boondocking options are available on-site, making it a perfect weekend getaway to immerse yourself in nature and the running community. This event truly embodies an adventure run, inviting all to make their mark on trails that neighbor the renowned Fossil Rim Wildlife Center.