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July 25 - 27, 2024 • Washington Island, WI
Gislason Beach

~ 36 / 24 / 12 / 8 Hour Solo or Relay Format ~

Washington Island Ultra
Mammoth Black


36 Hour Solo
triathlon, duathlon, ultra swim, ultra bike, ultra run
  - 36 hour time limit / $300 registration fee
36 Hour Relay Team
triathlon, duathlon
  - 36 hour time limit / $275 registration fee (per person)

24 Hour Solo
triathlon, duathlon, ultra swim, ultra bike, ultra run
  - 24 hour time limit / $275 registration fee
24 Hour Relay Team
triathlon, duathlon
  - 24 hour time limit / $250 registration fee (per person)

12 Hour Solo
triathlon, duathlon, ultra swim, ultra bike, ultra run
  - 12 hour time limit / $250 registration fee
12 Hour Relay Team
triathlon, duathlon
  - 12 hour time limit / $225 registration fee (per person)

8 Hour Solo
triathlon, duathlon, ultra swim, ultra bike, ultra run
  - 8 hour time limit / $250 registration fee


This event usually sells out the day we open registration. Priority registration for those on the waitlist and those athletes who have raced in the last 2 years will open on August 1st, 2024 at 9:00am est. If we are not sold out by August 2nd at 9:00am est, general registration will become available and anyone may register. The race has sold out in 24 hours for the last 3 years - please join our waitlist to get access to priority registration.

Please click the button below to join the waitlist and provide us a First Name, Last Name and Email address for each person who will be attempting to register on August 1st. Your entire team must register online before the race sells out. We do reserve a small number of spots for those team members who were unable to register - these are handed out on a first come first serve basis. Athletes may click here to join the waitlist.


36 Solo / Team & 24 Hour Solo athletes:
- Mammoth / Island branded backpack (athlete check-in bag).
- Participant Tri-blend event shirt.
- $20
 gift certificate towards race merchandise.
- Fully stocked aid station with Hammer Nutrition products.
- On-site breakfast, lunch, dinner and late night pizza (plus coffee, tea & hot cocoa).
Hand made wooden finishers medal (made by the race organizer).
- Professional event photos (the best in the triathlon industry, no joke).
- Sponsor samples and free gifts.

24 Team & 12 Hour athletes
- Washington Island Ultra Sweat Towel
- Participant Tri-blend event shirt.
- $15 gift certificate towards race merchandise.
- Fully stocked aid station with Hammer Nutrition products.

- On-site breakfast, lunch, dinner and late night pizza (plus coffee, tea & hot cocoa).
- Hand made wooden finishers medal (made by the race organizer)).
- Professional event photos (the best in the triathlon industry, no joke).
- Sponsor samples and free gifts.

8 Hour athletes
- Participant Tri-blend event shirt.
- $5 gift certificate towards race merchandise.

- Fully stocked aid station with Hammer Nutrition products.
- On-site breakfast, lunch, dinner and late night pizza (plus coffee, tea & hot cocoa).
- Hand made wooden finishers medal (made by the race organizer)).
- Professional event photos (the best in the triathlon industry, no joke).
- Sponsor samples and free gifts.

Mammoth Logo
Mammoth Black
Mammoth Podcast

This event is produced by Mammoth Endurance, the leaders in ultra triathlon racing in the United States. Our Mission at Mammoth is to organize the highest quality and most thoughtful ultra triathlons in the world. We're a small, family owned and operated business with over 30 years of experience producing endurance events around the country. 

You can use these links to meet our team or read about our company values.

Make sure you check out The Mammoth Podcast to find inspiration to keep working hard towards your goals.


This event is sanctioned by the World Ultra Triathlon Association (WUTA). WUTA provides structure, guidance, and resources, at no charge, to race directors and athletes who are organizing or participating in ultra-triathlon events. WUTA is working towards becoming a 501(c)(3) registered non-profit and is 100% volunteer driven.

Visit (under construction) for additional details and to learn more about the World Ultra Triathlon Association.


Board the ferry to the Island,


and experience a race like no other.

Washington Island Observer

We love Washington Island, and we work hard to make sure our event leaves a positive impact on the community of people who call this wonderful place home. There is something special about this Island and you need to spend an extra day or three on it to really find the relaxation that it can offer. Please help us in supporting the Island by picking up after yourself, being kind to those you see on the course and supporting the local families who run the small business you'll find on the Island.

Visit Discover Door County for information about the Island and all it's wonderful parks, shops, hotels and places to eat.



Our athlete guide contains everything you will need to know for your event. We make this guide available to you at all times so you can plan ahead and be as prepared as possible for you event. 

We will post the current years Athlete G
uide 2 months prior to the start of the race. 

It is the athletes responsibility to read the athlete guide in its entirety and familiarize yourself with the rules, courses, schedule and other details pertaining to the event. Athletes will be emailed a final version of this guide 30 days before the start of the race. It is rare that changes occur to the athlete guide. In the case some adjustments have been made, those changes will be highlighted on the first page 
of the guide. 

Washington Island Athlete Guide
WI Athlete Guide


Thursday - July 25, 2024
2:00pm - 7:00pm • Athlete check-in at the village / racers can setup their pit area.
6:30pm - 7:00pm • Optional swim course talk with a race director.
7:30pm - 8:00pm • Mandatory 36 hour athletes pre-race meeting (24 / 12 / 8 also welcome).

9:45pm - 9:55pm • 36 hour athletes - call to start.
10:00pm • 36 hour race start (must start on bike).

Friday - July 26, 2024
7:00am • Swim course is open.
7:00am - 8:45am • Athlete check-in at the village / racers can setup their pit area.
8:45am - 9:15am • Mandatory pre-race meeting (24 / 12 / 8 hour athletes).
9:45am - 9:55am • 24 / 12 / 8 hour athletes - call to start.
10:00am • 24 / 12 / 8 hours race start.
1:00pm • Lunch is served inside the Red Barn.
5:00pm  • Quiet hours begin inside the village.
6:00pm • Swim course closes for the day / 8 hour race is finished.
6:00pm • Dinner is served inside the Red Barn.
7:00pm • Night hours begin (lights must be worn on the bike and run).
10:00pm • 12 hour race is finished.
10:30pm • Pizza is served inside the Red Barn.

Saturday - July 27, 2024
6:00am • Coffee and Tea is served inside the Red Barn.
7:00am • Swim course is open.
7:00am • Night hours end (lights may be taken off the bike and run).
9:00am - 10:00am • Power Hour / Final hour of racing.
10:00am • 24 / 36 hour race is finished.
10:00am - 10:30am • Finishers medal handout / Photo opportunities.
12:00pm (noon) • All belongings must be removed from the area.

Thursday - August 1st, 2024
9:00am est • Priority and waitlist registration opens for 2025.



This race and this place will change you if you allow it. There's something in the water up here on the Island. This event is like nothing you'll experience anywhere else in the world. Everyone here has something going on in life, leave it at the ferry dock or if you must, bring it over with you and bury it here on the Island. 

This race will leave you feeling uplifted and exhausted all at the same time. You'll start to get it once you reach the ferry dock and drive onto the boat. The doors slam behind you and you're off. Crossing over deaths door passage and on your way to the Island. For some reason, all the worries of life disappear as you slowly cruise over to the docks.

We have two rules:
1. Don't be a jerk. If you are, we'll kick you out of the race. There's no room for that here.
2. Don't quit. Whatever that means for you. Push your limit, it's not meant to be easy.

My family and I stumbled upon this place over 10 years ago and fell in love with it. The people who call this lovely place home welcome us with open arms and allow us to come and play on their home turf every year. Don't for a second take this space for granted. Be kind and thoughtful to those on the road, working in the shops and anyone else you see who may be residing or visiting the Island. 

We can't wait to see you in July. This race is special to us and we hope you find the same love for this Island that we have found. 

Washington Island Ultra


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 team of up to 8 athletes. Choose from an 8 hour, 12 hour, 24 hour or 36 hour race.

You and or your team will be given 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.

WI Course


0.25 miles (.402km) Open Water Loop

The swim takes place in a beautiful bay looking south from Gislason Beach. The water here is incredible - it's crystal clear, generally comfortable and usually sees a water temp of around 65 - 72 degrees. 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.

You will swim a 0.25 mile loop and then exit the water after each completed loop. Timers will be sitting at a table on the shore and it is important you exit the water, follow the loop around the timing table and communicate your race number with our volunteer swim timers. The swim course is open from 7:00am - 6:00pm Friday and 7:00am - 10:00am on Saturday. 

A swimmer may use any swim stroke to propel themselves through the water and may tread water or float. You may not use any floatation device, flippers, or fins on the swim. Swim Caps are required at all times. We ask you to wear a brightly colored cap to help our lifeguards maintain good visibility on you during your swim. Wetsuits are allowed. 

A kayaker or paddle boarder will be in the water at all times. We often have multiple "boats" on the water at once depending on the amount of swimmers in the water.


9.90 miles (15.932km) Open Road Bike Loop


The bike segment boasts some butter smooth roads, awesome sights and is generally a fast course. As it gets dark, you will be required to use adequate lighting (white light) on the front of your bike and a red flashing light on the rear. The front white light should broadcast decently 10’ or more. We also highly suggest a headlamp attached to your helmet. Ensure you have sufficient batteries to last throughout the night. There is electricity available to charge spare batteries inside the race village.

Although the course is referred to as a "fast course" it is not flat. In fact, there are two moderate climbs on the course. Please ride with caution. It is HIGHLY recommended you practice some night riding before making your way up to the event. All 36 Hour athletes are REQUIRED to begin and complete one loop of the bike course to begin the event unless you are race the 36hr run or swim. At the end of the day, cars are bigger than bikes so please stay alert and be aware of your surroundings.

Roads are OPEN and you must obey all traffic laws while on course. “Just like a training ride” is the mindset while on the route. It is the riders responsibility to know and understand the bike route. We do have glowing cones and reflective signs placed along the route during the entirety of the event.

Road bikes must be in good working order. Remember to inspect your bikes before the race so you do not have any mechanical surprises on the bike course. You may use more than one bike during the race.

You must wear an ANSI/Snell approved bike helmet during the bike course and have it buckled at all times when touching your bike. YOU MAY NOT DRAFT during this event. While on the bike segment, cyclists shall not work together to improve performance, efficiency, or position by teamwork or other joint conduct. All cyclists must assume and maintain a staggered riding position relative to the cyclists directly ahead.

No headphones are allowed. While you may carry a phone, you cannot use it for music on the bike.

Washington Island Bike Course


2.00 mile (3.218km) Out and Bike Run Loop

The run is on paved roads and takes you alongside the shore of Lake Michigan with plenty of shade but also a few sections of exposure to sun. Remember that roads are OPEN - please run with caution as vehicles will still be using the roadway. The course is flat as a pancake. There is literally zero elevation on the run course.

Crew is not allowed to be on course for support. All support must be done within the village. You may stop and rest at any time along the course, but the race clock is still in motion. Athletes may not receive any assistance in the form of transportation. You may not have your support crew pace you during the run.

Breaking my own rule: The stars are usually incredible on the island at night. We encourage you to break our headlamp rule for about 10 seconds. Make sure there are no cars around, stop, turn off your light and look up - the sky can be amazing!



Lights are required on the run and bike between the hours of 7:00pm and 7:00am. On the run, a headlamp or handheld flashlight must be worn at all times during the night hours. On the bike, a white headlight AND a red rear light are required at all times during the night hours. We do have a place where you can charge your batteries during the day to make sure your gear will last through the night.

We will have a charging station available inside the village. However, we do Highly recommend you charge all your head and tail lights prior to arriving to the race site. 


The ISLAND Village

Your Home Base During The Event. 

Each athlete will be assigned a "pit area" inside our village. This pit area is where you will store belongings during the event and from where your crew will support you. The village is right off the main bike and run course and directly across from the beach - giving you easy access to your supplies / food and crew for all three disciplines. All food is served inside the Red Barn. It's the big red barn that's directly in the middle of the village. You can expect to find a charging station towards the front of the race village near the aid station. Our Aid station will have Hammer Nutrition products available to you as well as a variety of sweet and salty snacks to munch on. We do not provide phone cords but will have power strips available for you to plug in and charge your devices.

You may bring your own chairs, coolers, food, equipment, etc.. We ask that there are no open flames inside your pit area. Please have adequate weights to hold down the tent in case we experience any type of wind, which is common for this race. You may bring your own lights and "camping" equipment but jeep in mind space is tight and quite limited. You're not here to sleep - you're here to race!

Quiet hours in the village begin at 5pm. We will have music playing during the day.

Portable Restrooms are available inside the village area. 

Hammer Nutrition


Athletes have the ability to receive aid from their crew every lap of the race This is one of the
many benefits of racing on the Island

We also make a point to keep our Aid Station full with both liquid and solid fueling options. Hammer Nutrition provides us with clean products that have been rigoursly tested to ensure quality and effectiveness for their athletes. We provide, free of charge, various Hammer products to all registered athletes. 

We highly recommend fueling with Hammer and using their product while training. All of their products are guaranteed to be free of any banned substances and help you reach your maximum potential as an athlete. They also provide fueling education in the form of videos, booklets and podcasts. There's a reason Hammer is trusted and used by some of the best athletes in a variety of different sports. Hammer on, friends. 

Lastly, we will have water and RedBull products available throughout the entire event at the Aid Station.

Washington Island


Made By Hand Finisher Medals

We're not a big race company... We're a family run and family focused race with a massive passion for people. One of our favorite things we do is custom make all our own finisher medals. You put hours and hours into training, we want to hand you something that means more. So, we design, cut, sand, paint, stain, assemble and finish all our awards by hand. Every finisher who receives a medal knows we've put in the work to give you something with a little more meaning to it. Every award has been worked on by myself, my wife or our son (Yes, Leo helps too). 

From our family to you - it's our little gift and a way to say Thank You for supporting our races. 



USA Triathlon
Hammer Nutrition
Washington Island
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