Mammoth Endurance 36 Hour Tri Relay

Mammoth Endurance Ultra Triathlon Relay : April 30 to May 2, 2026

The event takes place at Oak Mountain State Park in Pelham, Alabama. It offers two relay options: 24-hour and 36-hour triathlon relays. Registration closes Mon, Apr 27.

Race format and rules

Teams of three compete on an open-course triathlon with the swim restricted to daytime hours. Teams accumulate points over the selected 24-hour or 36-hour period. There are no restrictions on how much of each discipline a team completes or the order in which team members perform events. The format includes overnight activity and the associated challenges of sleeplessness. Visit the organization's website for the most recent information.

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