2026 Alabama Triathlon & Relay

April 30 - May 2, 2026 | Shelby County, Alabama
Oak Mountain State Park

Registration

All race registrations are completed online. We do not accept paper forms, do not offer race day registrations and do not accept payment from other services like PayPal or Venmo. You may register online by clicking here.

All Double ANVIL athletes (solo and team) are required to have our Medical Release Form signed by a licensed doctor. This form must be submitted to our race director via email one month prior to the race start.

Athletes may download the Medical Release Form here.

A man wearing a white helmet and a white long-sleeve shirt rides a red road bike on a paved road with a yellow centerline, surrounded by trees with green foliage.
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Medical Form

Race Categories

  • Oak Mountain Half Triathlon 70.3 | May 3rd

  • Oak Mountain Mammoth Endurance 24 | 36 Hour Relay | April 30-May 2nd

Swimmers in water with mist and a large fish fin visible above the surface.
A cyclist wearing a red shirt, helmet, and black shorts riding a bike quickly along a road with blurred trees in the background.
Bicycles parked in front of tents at an outdoor event, with an open sky and people in the background.
Two women jogging on a road with trees in the background, one wearing sunglasses and the other with a knee brace, during a sunny day.
Silhouette of a star with paint splatters around it.

COURSE INFORMATION - Coming Soon

Our courses consist of shorter loops inside a controlled area. The distance of our events require extra safety measures be taken to ensure athletes are cared for and able to receive medical help if needed while on course. These shorter loops allow for your family or crew to be much more involved in your race, resulting in an overall more enjoyable experience for athletes and their support crew.

The courses are inside a state park and are well marked / manned by volunteers during the event. Try it before you bash it - we guarantee you’ll find the shorter loops helpful and more enjoyable during your event.

A cyclist wearing a helmet and a black FAME cycling suit riding a white bike at high speed outdoors, with a blurred background indicating motion.
A cyclist wearing a helmet and orange jersey riding uphill on a winding road surrounded by tall grass.
Two athletes in wetsuits standing in calm water near the shore, with a boat in the distance.
A male athlete wearing a black wetsuit with yellow accents, a black swim cap, and goggles, appears to be wet and exhausted after a swim, with water droplets visible on his skin and gear.
A woman wearing a wetsuit, swimming cap, and goggles walking out of a body of water, holding a water bottle.
Three men are sitting under a canopy in an outdoor wooded area, relaxing and smiling. They are surrounded by hanging towels and clothing, with some drinks on a table nearby.
A young man wearing a black beanie and black hoodie stands in profile outdoors during dusk or dawn, with a dark, blurred natural background.
Three people in wetsuits and swim caps standing in the water at sunset, with a kayaker in the background.
A man with a tattoo on his arm is receiving a medal and wearing a cap and sunglasses, while another man helps him put on the cap. Two other men are in the background, one wearing a red and black shirt and sunglasses. It appears to be an outdoor event

Ready to test your limits?

Whether you’re chasing your first ultra or your next finish line, Mammoth Endurance is here to carry you through.

Register Triathlon
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