Prepare to push your limits and forge unforgettable memories at the Mammoth Endurance 12 | 24 Hour Tri Relay, set for April 30, 2026, in scenic Pelham, AL. This challenging event offers both 12-hour and 24-hour team relay options, alongside a grueling 24-hour solo relay, all designed to test your resilience and celebrate the spirit of endurance. Mammoth Endurance events are renowned for fostering connection and supporting athletes as they chase new limits, promising more than just miles—they offer meaning.

The course is uniquely designed with short, repeatable loops entirely within the breathtaking confines of Oak Mountain State Park. This intentional layout maximizes athlete safety and provides constant encouragement from volunteers and fellow participants throughout the swim, bike, and run segments. The true heart of the Mammoth Series lies in its exceptional on-course Aid Station and Athlete Village, where athletes and their personal crews have access to consistent refueling, essential gear swaps, and vital motivational boosts on every loop. Expect to be well-supported with carefully prepared real food and an on-site medical team.

The Mammoth Endurance 12 | 24 Hour Tri Relay stands apart with its commitment to a supportive environment, featuring an intentional lower capacity and a high lifeguard-to-participant ratio for the swim. Typical race day conditions in late April offer pleasant highs around 79°F and lows around 55°F, with only a 16% chance of precipitation, providing an ideal climate to embrace the challenge and achieve your endurance goals.