Grandmaster Ultras 2025

Immerse yourself in the majestic Arizona landscape at our thrilling endurance event! Come challenge your limits under the sunny skies as you navigate through miles of awe-inspiring ATV trails in the desert. Whether you're tackling the 100 miles or 100K, with a generous 48-hour cutoff, or stepping into the 50K and 50-miler races with a 24-hour window, your spirit of adventure will be ignited. Pacers are welcome to join you after dark or for your second lap to keep you company and pumped up as you push for the finish line. With special allowances for those over 70, everyone gets the support they need to thrive. Embrace the scenic route, featuring the iconic Thelma Louise loop with breathtaking views and varied terrain, as this race promises an unforgettable experience that'll test your endurance and stir your soul!