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February 20 - 23, 2025 • Clermont, Florida
Lake Louisa State Park


Mammoth Black


Single Anvil Triathlon
2.4 mile swim, 112 mile bike, 26.2 mile run.
    - 17 hour finish time limit / $675 until May 31, then $750.

1.5x Anvil Triathlon
3.6 mile swim, 168 mile bike, 39.3 mile run.
    - 30 hour finish time limit / $900 until May 31, then $1,000.
Double Anvil Triathlon
4.8 mile swim, 224 mile bike, 52.4 mile run.

    - 36 hour finish time limit / $1,075 until May 31, then $1,200.

Single Aquavelo
2.4 mile swim, 112 mile bike.
    - 13 hour finish time limit / $675 until May 31, then $750.
Double Aquavelo
4.8 mile swim, 224 mile bike.
    - 26 hour finish time limit / $1,075 until May 31, then $1,200.

Single Duathlon
112 mile bike, 26.2 mile run.
    - 16 hour finish time limit / $675 until May 31, then $750.
Double Duathlon
224 mile bike, 52.4 mile run.
    - 34 hour finish time limit / $1,075 until May 31, then $1,200.

Relay Double Anvil Triathlon
4.8 mile swim, 224 mile bike, 52.4 mile run.
    - 36 hour finish time limit / $450 until May 31, then $500 per person.


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.
s may download the Medical Release Form here.


All athletes receive these perks:
- Mammoth / WUTA branded backpack. (athlete check-in bag)
- Participant Tri-blend event shirt.
- 30 minutes of free on-site massage therapy. (before, during or after the race)
- Access to on-site 24 hour medical team.
- Free pre-race pasta dinner.
- On-site breakfast, lunch, dinner and late night snack. (Plus bottomless coffee, tea & hot cocoa)
- Professionally catered lunch at the post race
athlete's banquet.
- Real time live athlete tracking & precise timing / scoring.
ANVIL heavy-metal finishers medallion.
- Sponsor samples and free gifts.

Single / Half athletes:
- Tri-blend finishers T-shirt.
- ANVIL finishers certificate.

Double / 1.5x athletes:
- Tri-blend long sleeve T-shirt
- World Ultra Triathlon Association finishers certificate and pin.

*all athletes are eligible to win an official ANVIL Collectors Coin by finishing in the top three of their category.

Mammoth Podcast
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. All athletes registered for any distance further than a 140.6 mile full distance triathlon are eligible to earn both Regional and World Championship Points. 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.

USA Triathlon

This race is sanctioned by USAT (United States Triathlon Association). All athletes are required to belong to USAT, either with a yearly membership or by purchasing a one-time “day use” license. If you do not hold a USAT membership you will be given the opportunity to purchase a one day pass during the online registration process. 

Visit for additional details and to learn more about the United States Triathlon Association.


Mammoth Endurance and WUTA have an agreement with the United States Anti-Doping Agency (USADA). USADA personnel are at each event to collect, test and remit results for 2 - 3 randomly selected athletes. Under certain conditions an athlete may be pre-determined for testing prior to the race. Testing is carried out at one of the two Olympic Certified Laboratories in the United States. Testing with USADA ensures our sport is receiving the highest standard in Anti-Doping testing. 

Visit for additional details and to learn more about the United States Anti-Doping Agency.



Since 1985. Home Of The Original Ultra-Triathlon.



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 9 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. 

Florida AG
FL Athlete Guide


Thursday - February 20, 2025
7:30am - 12:00pm (noon) • Course / Village Setup. *Racers and their crew are welcome to come help!
 Lunch is provided.
2:00pm - 3:30pm • Athlete Check-in at the village / racers can setup their pit area.
3:45pm - 4:15pm • Optional Swim Course Preview with a Race Director.
5:30pm - 7:30pm • Mandatory Pre-race Pasta Dinner / Race Briefing

Friday - February 21, 2025
6:15am • Breakfast and coffee is served at the beach area.
6:30am • Athlete Roll Call. (*All athletes must be present!)
6:50am • National Anthem.
7:00am • Race Start for Double,
 1.5x, Single, Half and Aquavelo athletes. (beach area)
8:00am • Race Start for Double and Single Duathlon athletes. (inside village)
12:30pm  • Lunch is served in the village.
5:30pm • Dinner is served in the village.
8:00pm • Single Aquavelo race cutoff time.
10:30pm • Late Night Snack is served in the village.

Saturday - February 22, 2025
12:00am • Single Anvil, Single Duathlon and Half Anvil race cutoff time.
6:15am • Breakfast and coffee is served in the village.
9:00am • Double Aquavelo race cutoff time.
1:00pm • 1.5x Anvil race cutoff time.
12:30pm • Lunch is served in the village.
5:30pm • Dinner is served in the village.
6:00pm • Double Duathlon race cutoff time.
7:00pm • Official race cutoff time.
7:15pm - 9:15pm • Village tear down / Race clean up.

9:15pm • All belongings must be clear from the village.

Sunday - February 23, 2025
10:30am-2:30pm • Post race athlete banquet. 

*Food service times are approx as we are making meals from scratch

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Double ANVIL


We are very excited to host the Double Ultra Triathlon World Championships in 2025 at the Florida ANVIL in Clermont, FL. Both men and women from around the world will be facing off for the 281.2 Double World Ultra Triathlon Championship title. 

The event is sanctioned by the United States Triathlon Association (USAT) and World Ultra Triathlon Association (WUTA). Eligible athletes will be rewarded both regional and national points from WUTA. The United States Anti-Doping Agency (USADA) will be conducting drug tests to ensure our sport remains clean. 

Prize money will be awarded to the top three male and female finishers in the double distance.

1st place - $1,000.00 USD
2nd place - $750.00 USD
3rd place - $500.00 USD

All rules set in place by the sanctioning bodies must be followed for the athlete to be eligible for prize money. Any athlete or crew member who does not follow the rules laid out in the athlete guide and crew conduct agreement will result in the athlete being disqualified without exception.

We wish all athletes the very best of luck, a healthy season of training and safe travels to the race.

See you at the World Championships!

USA Triathlon


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.

FL Course


Doubles: 12 loops / 1.5x: 9 loops / Singles: 6 loops / Half 3 loops

The swim takes place off the beach of Lake Louisa State Park on Lake Louisa, which is considered a shallow lake, with water depths no greater than 8 to 9 feet across the whole lake. The normal water temp for this race has been an average of 65 to 70 degrees, so wetsuits are recommended. 

You will swim a 2112 foot/644-meter clockwise out and back pattern around a swim line (swim line length is 1056 feet/322 meters). Half athletes will complete 3 loops; Single athletes will complete 6 loops; 1.5x athletes will complete 9 loops; Double athletes will complete 12 loops. You must wear the colored Mammoth swim cap provided to you during check-in. Timers will be sitting at a table on the shore timing your laps and will observe you with the colored swim cap you are wearing. At the main buoy/turn area, we will have two aid station floats where you can place your water bottles into the cup holes and food items beside them. This will allow you to get your own aid without your support crew having to wade 50 feet or so from shore.

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. The swim must be completed within 2 hours of race start for the Single and Half athletes (9:00am Friday), within 4 hours of the race start for the 1.5x athletes (11:00am Friday), and within 5 hours of race start for the Double athletes (12:00pm Friday).

Florida ANVIL Swim Course


Doubles: 37 loops / 1.5x: 27 loops / Singles: 18 loops / Half: 9 loops


The bike segment takes place inside the park. 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.

The bike segment is a 6.009 mile (9.670 kilometer) out and back loop. You will start the bike in the village area.

Double athletes will do 37 laps, which means you will have biked 222.347 miles. To make up the remaining 1.652 miles (to equal 224 total), on your first bike lap, you will ride down the road .826 of a mile (there will be a large sign stating “DOUBLE FIRST LAP TURN AROUND HERE”) and you will ride back through the timing station and then start the first of 37 laps.

1.5x athletes will do a beginning 5.76 miles (2.88 out then back through the main timing) and then do 27 loops to equal 168 miles. There will be a large sign stating “1.5x FIRST LAP TURN AROUND HERE”. You will make your way back to the race village then start the first of your 27 laps.

Single athletes will do a beginning 3.6 miles (1.8 out then back through the main timing) and then do 18 laps to equal 112 miles. There will be a large sign stating “SINGLES FIRST LAP TURN AROUND HERE”. You will make your way back to the race village and then start the first of your 18 laps.

Half athletes do not need to do a partial lap.

We have calibrated the course with the same measuring equipment used by the Olympic committee (it is called a Jones Counter) so we are accurate on the mileage. Remember, GPS data from your watch, with long distances and multiple loops, will often be incorrect over time. Our courses are carefully marked and measured. Do not rely on your satellite GPS watch as an accurate measurement.

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. A variable time penalty shall be imposed for any violation of this. You may stop or walk your bike, but no time adjustments will be made.

The bike loop is pretty much flat with two medium size hills plus a few other small rollers. The turnaround point is just before the campground. There is a decent size opening in the road giving you a little extra room to make that 180 degree turn and head back to the village. Please be careful making your turn around and be aware of vehicles that may be entering or exiting the campground. We will have course signage out notifying motorists of the event. At the end of the day, cars are bigger than bikes so please stay alert and be aware of your surroundings.

No headphones are allowed. While you may carry a phone, you cannot use it as a communication device.

Single and half athletes must complete the bike segment within 13 hours of the race start (8:00pm Friday), 1.5x athletes within 20 hours of the race start (3:00am Saturday) Double athletes within 26 hours of race start (9:00am Saturday).

Florida ANVIL Bike Course


Doubles: 52 loops / 1.5x: 39 loops / Singles: 26 loops / Half 13 loops

The run segment takes place on asphalt road. The run course is a 1.00769 mile (1.621719 kilometer) loop course.


Half athletes will complete 13 loops, Single athletes will complete 26 loops, 1.5x athletes will complete 39 loops and Double athletes will complete 52 loops. You must use a flashlight/head light for the run section once it gets dark as well as a flashing red light on your back for greater visibility.

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. You may, on your last run lap, invite your friends and family to run with you.

Half and Single athletes must complete the run segment within 17 hours of the race start (12:00am Saturday), 1.5x athletes within 30 hours of the race start (1:00pm Saturday) Double athletes within 36 hours of race start (7:00pm Saturday).

Florida ANVIL Run Course