Mammoth Endurance 36 Hour Tri Relay
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Event details
Mammoth Endurance 12 | 24 | 36 Hour Tri Relay takes place April 30 - May 2, 2026 at Oak Mountain State Park in Pelham, AL. Registration for the event closes on Mon, Apr 27 at 11:59 PM ET. The event is presented as an ultra triathlon relay featuring swim, bike, and run loops. The course includes shorter loops and an on-site support village.
Race format and participation
Available durations:
- 12 hours
- 24 hours
- 36 hours
Participants may enter as a solo competitor or as part of a team of up to six. Each team member registers separately and the final team composition and distances are confirmed ten days before the race. Only one team member may be actively on the course at a time; that member completes their swim, bike, or run loop(s) and returns to the athlete village to transition to the next member. There is no required sequence of disciplines, no minimum laps per athlete, and no fixed requirement for which events a single athlete must perform. Each completed lap is assigned points, and teams accumulate points during their chosen time period. The event also offers pre-race and post-race community support. Visit the organization's website for the most recent information.
