Mammoth Endurance 36 Hour Tri Relay
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Event overview
Mammoth Endurance 12 | 24 | 36 Hour Tri Relay is an ultra triathlon relay held April 30 - May 2, 2026, at Oak Mountain State Park in Pelham, AL. The event uses shorter loops and a central athlete village. Organizers provide on-course support and a community structure that includes pre- and post-race support activities.
Distances
- 12-hour
- 24-hour
- 36-hour
Race format and rules
The event can be entered solo or as a team of up to six. Each participant registers separately and the final team composition is confirmed ten days before the race. Only one team member may be active on course at a time. That member completes designated swim, bike, or run loop(s) and then returns to the athlete village to transition to a new team member. There is no required sequence, no minimum laps per athlete, and no required discipline for any single athlete. Each completed lap earns a set number of points; teams aim to accumulate as many points as possible within their chosen time period.
Registration
Registration closes on April 27, 2026. The event is described as community-oriented with an emphasis on support services and a race environment built around performance and team strategy. Visit the organization's website for the most recent information.
