October 9 - 12, 2025 • Spotsylvania, Virginia
Lake Anna State Park
~ 2x / 1.5x / 1x ANVIL Ultra Triathlon ~
RACE CATEGORIES
Single Anvil Triathlon
2.4 mile open water swim, 112 mile bike, 26.2 mile run.
- 17 hour finish time limit / $850
1.5x Anvil Triathlon
3.6 mile open water swim, 168 mile bike, 39.3 mile run.
- 30 hour finish time limit / $1,200
Double Anvil Triathlon
4.8 mile open water swim, 224 mile bike, 52.4 mile run.
- 36 hour finish time limit / $1,200
Single Aquavelo
2.4 mile open water swim, 112 mile bike.
- 13 hour finish time limit / $850
Double Aquavelo
4.8 mile open water swim, 224 mile bike.
- 26 hour finish time limit / $1,200
Single Duathlon
112 mile bike, 26.2 mile run.
- 16 hour finish time limit / $850
Double Duathlon
224 mile bike, 52.4 mile run.
- 34 hour finish time limit / $1,200
Relay Double Anvil Triathlon
4.8 mile open water swim, 224 mile bike, 52.4 mile run.
- 36 hour finish time limit / $750 per person
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.
ATHLETE PERKS
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.
- Professional event photos (the best in the triathlon industry, no joke)
- Sponsor samples and free gifts.
- Tri-blend long sleeve T-shirt
- ANVIL finishers certificate.
*all athletes are eligible to win an official ANVIL Collectors Coin by finishing in the top three of their category.
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 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 www.usatriathlon.org for additional details and to learn more about the United States Triathlon Association.
THIS IS ANVIL
Since 1985. Home Of The Original Ultra-Triathlon.
ATHLETE GUIDE
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. 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.
We will post the current years Athlete Guide 1 month prior to the start of the race.
SCHEDULE OF EVENTS
Thursday - October 9, 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 - 4:00pm • Optional Swim Course Preview with a Race Director.
5:00pm - 6:00pm • Mandatory Pre-race Pasta Dinner / Race Briefing
Friday - October 10, 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 ALL 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 - October 11, 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 - October 12, 2025
10:30am-2:30pm • Post race athlete banquet
*Food service times are approx as we are making meals from scratch
ON COURSE AID STATION
Athletes have the ability to receive aid from their crew every lap of the ANVIL. This is one of the
many benefits of racing the ANVIL race.
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.
Our aid station will also serve as the "kitchen" area inside the village. This is where you and or your crew will stop to get breakfast, lunch, dinner and a late night snack. Our food is all home cooked with care and served timely to help you stick with your fueling plan and have a successful event. You can find our race menu in the Athlete Guide. Vegan / Gluten free options are available for every meal upon request.
Lastly, we will have water and RedBull products available throughout the entire event at the Aid Station.
COURSE INFORMATION
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.
SWIM COURSE DETAILS
Doubles: 12 loops / 1.5x: 9 loops / Singles: 6 loops / Half 3 loops
The swim takes place off the beach of Lake Anna State Park on Lake Anna, which is considered a shallow lake, with water depths no greater than 10 to 12 feet across the swim area of the 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; 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 (9:00 a.m.), 1.4x within 4 hours of race start (11:00am), and within 5 hours of race start for the Double athletes (12:00 p.m.).
You must stage your bike and bike gear at the swim area. Following completion of your swim you have the ability to shower and use a restroom for changing. You will get on your bike at the swim location and ride up to the village to get the total distance needed for your bike segment.
BIKE COURSE DETAILS
Doubles: 44 loops / 1.5x: 33 loops / Singles: 22 loops / Half: 11 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 5.0769 mile (8.169 kilometer) loop inside the park. You will start the bike demo the swim area.
You’ll begin your bike down at the swim exit and ride your bike up to the race village location (red line on the diagram). At that point, you will begin your first loop on the bike course by heading out to the Park Loop Turnaround, riding back through the village to the Cabin Loop Turnaround and
final riding over the Finish Line (red line on diagram) at the race village location. This completes one loop of the course.
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 (8:00 p.m. Friday), 1.5x athletes within 20 hours of race start (3:00am Saturday), Double athletes within 26 hours of race start (9:00 a.m. Saturday).
RUN COURSE DETAILS
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, 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.
The ANVIL Village
Your Home Base During The Event.
Each athlete will be assigned a "pit area" inside our ANVIL village. This pit area is where you will store belongings during the event and from where your crew will support you. The bike and run course go directly through the village every lap, giving you easy access to your supplies / food and crew. Our food tent, aid station and charging station are located directly in the middle of the village. The food tent is where athletes and crew can eat home cooked breakfast, lunch, dinner and a late night snack. Athletes have access to the food tent included with their registration. Crew must purchase food tickets in order to eat from our food tent during the race. The charging tent is to be used for charging phones, lights, etc... We do not provide phone cords but will have power strips available for you to plug in and charge your devices.
You may rent a tent space from Mammoth or bring your own 10x10 tent. You may bring your own chairs, coolers, food, equipment, etc.. We ask that there are no open flames inside your pit area. If bringing your own tent - you must have adequate weights to hold down the tent in case we experience any type of wind. Tent walls are also recommend to help protect you and your gear from the elements. We provide lights throughout the entire village area and will string blue or white LED top lights in your tent once you are setup and ready. You may also bring your own lights if you choose.
Renting a tent space for Mammoth:
During registration, you'll have the choice to rent a shelter from us. This is a 10x8 space and includes one 8 ft table and two folding chairs. We have a limited supply of space available so please make sure you register early and add-on a shelter when registering.