
From the Organizer
The Original 24 Hour Triathlon.
Organized by: Mammoth Endurance | Built for the Pursuit, Not Finish Lines.
For complete race information, please visit www.mammothendurance.com/oakmountainultrarelay
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General Race Format:
The goal of this event is to log as many complete triathlons, duathlons, or single laps (for run, swim or bike only events) in the allotted time. You may choose to race as a solo athlete or as a relay team. Choose from either a 12 hour or 24 hour race.
You and or your team will be assigned a "pit area" inside the Village where you setup camp for the duration of the event. This is where you sleep, eat, store your gear, etc.. - your home away from home.
You are not required to change disciplines in between each leg of the event. For example, you may bike 10 laps in a row, then swim 5 and then run 8. You can complete laps of any discipline in any order. Teams are not required to change athletes after each leg. For example, team member A can run 5 loops in a row, then bike 3 before handing off to team member B. However, teams may only have one athlete circulating the course at a time and must switch between team members inside the transition area.
Solo or Team Race Disciplines:
- Triathlon
- Duathlon
- Aquabike
- Ultra Run
- Ultra Bike
- Ultra Swim
General Course Information:
The swim takes place in a beautiful section of Oak Mountain State Park. The course is a .25 mile loop. The water here is great for swimming and sees a water temp of around 68 - 72 degrees at this time of year. The area you will be swimming is considered a shallow body of water with water depths no greater than 8 to 9 feet across the swim course.
The bike segment is 10.50 miles long and boasts some butter smooth roads inside the park with wide shoulders on both sides. The route curves through the park and you'll be surrounded by towering pines the entire time. This is an outrageous and back route so you'll have plenty of company out there on course as you get to know your fellow racers. The course has a few climbs as well as a few fun descents (being it an out and back). This park is one of the best local training grounds for area cyclists & we get to enjoy the beautiful route for 24 straight hours! What more could you want! The park closes at night so there will be little to no vehicle traffic into the evening hours. It is HIGHLY recommended you practice some night riding before making your way to the event.
The 2 mile run course follows a unique route for this park. We start by running a short section of smooth, easy trail along the shore of the lake. After the turnaround, you'll run through the pit area and find yourself back on the paved roads and running again along the edge of the water. There is small elevation gain in the route, but it is considered a fast run course.
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For complete race information, please visit www.mammothendurance.com/oakmountainultrarelay
Events
Weather
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
76°
Typical Low
51°
Chance of Rain
33%
Based on US Climate Normals data from Helena, 6 mi from the venue.
Host City
City Elevation
901 ft
Nearest Airport
BHM
Birmingham-Shuttlesworth International Airport · 19 mi
Time Zone
Central Time
From Endurance Grid
Line up lodging and travel early to lock in your race weekend.
Race Location
Your Next Start Line
Every finish line starts with a single decision. Claim your spot at Oak Mountain Ultra Relay, put it on the calendar, and turn “someday” into a start date.
Coming Up
The Mad Mallard 3, 6, 12 & 24 HR NIGHT TIME trail race.
160 miles away
The Devils Race Track Backyard Ultra
103 miles away
Emerald Coast Ultra
202 miles away
The Longest Night (50mi - 50k - 26.2 - 13.1 - 10k)
270 miles away
From Endurance Grid
This race spans more than one sport — here’s a guide to each, so you can understand what’s involved and decide if it’s the right fit. For course distances, logistics, and race-day specifics, always defer to the race organizer’s event page.
An ultramarathon is anything beyond the standard marathon — 50K, 50-mile, 100K, 100-mile, and timed events. Crossing the line is less about speed and more about not quitting.
From 5K to marathon, running races are an accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Frequently Asked Questions (FAQs)
Oak Mountain Ultra Relay
Apr 16, 2027