If you'd told me 5 years ago I'd willingly sign up to ride 100 miles through the Sierra Nevada mountains in 24 hours, I'd have laughed. That was until I attempted my first 100-mile ultra-endurance ride with my Arabian mare, Luna, and dropped out at mile 62 because a poorly fitted saddle rubbed a raw, bleeding sore on her side, and my hydration pack leaked all over my maps 3 hours into the ride. That humbling experience taught me something no training manual could: ultra-long distance endurance isn't just "a really long trail ride." It's a test of fitness, preparation, and partnership that demands months of deliberate work for both you and your horse, plus gear that's tested, broken in, and built to hold up to 12, 24, even 36 hours of constant use.
Unlike shorter trail rides or competitive arena events, ultra-endurance rides come with unique stressors: extreme heat or cold, rugged rocky or sandy terrain, mandatory veterinary checkpoints that can end your ride if your horse shows signs of fatigue or injury, and minimal access to support if something goes wrong. The difference between crossing the finish line proud and walking away early usually comes down to how much time you put into prepping both your horse and your gear long before you ever step foot at the starting line. Below is the no-fluff framework I've used to finish 8 100-mile rides and two 250-mile multi-day rides with zero major injuries, no vet check failures, and zero gear meltdowns.
Prep Your Horse First: Fitness, Acclimation, and Trust
Your horse is 70% of the equation for a successful ultra ride, and cutting corners on their prep will almost always lead to a DNF (did not finish) or, worse, a preventable injury.
Build Base Fitness 6--12 Months Out
You cannot cram fitness for a 50+ mile ride, and trying to rush your horse's conditioning is the fastest way to cause tendon, joint, or muscle damage. For horses new to endurance, start building base mileage 6--12 months before your target event:
- Begin with 10--15 mile rides 2--3 times a week, mixing terrain: soft dirt trails, rocky hills, and short stretches of sand to build cardiovascular stamina without excessive pounding on joints.
- Add hill repeats 1--2 times a week: 10--15 minutes of walking or trotting up moderate inclines to build hindquarter power for steep mountain grades or desert climbs.
- Gradually add weight to your saddle: start with 10lbs of extra gear (water, snacks, tools) and add 5lbs every 2 weeks to simulate the full load you'll carry on ride day, so your horse's muscles and tendons adjust to the extra strain gradually.
- Condition their hooves alongside their muscles: if your horse is barefoot, ride on rocky, abrasive terrain 3--4 times a week for 3 months before the ride to toughen the sole; if they're shod, work with an endurance-specific farrier to use lightweight, forged shoes with tungsten or borium inserts for traction, no heavy steel plates that add unnecessary weight.
- Stick to a strict 2-week pre-ride taper: cut your weekly mileage by 40% and keep workouts short and slow, so your horse arrives at the starting line fresh, not fatigued from overtraining.
Acclimate to Event Conditions Early
A horse raised in cool, rainy Pacific Northwest pastures will struggle in 95°F desert heat, and a lowland horse will get altitude sickness if you take it straight to a 9,000-foot mountain ride without adjustment. Start acclimating 4--6 weeks out to match your event's conditions:
- For hot rides: ride during the hottest part of the day for short, gradual sessions to let your horse's body adjust to sweating efficiently and regulating core temperature, rather than overheating at the first sign of high heat.
- For high-altitude rides: do 1--2 weekend camping trips to elevation 2,000+ feet higher than your home base to boost their red blood cell count and prevent altitude sickness mid-ride.
- Teach your horse to drink on the go: many horses refuse to drink when they're working hard, which leads to dangerous dehydration that can end your ride in hours. Practice stopping every 30 minutes during training rides for a quick sip, and add a splash of apple juice to their water if they're picky, so they associate drinking with moving forward, not long, forced rest stops.
Master Vet Check Drills Before Race Day
Mandatory vet checks are the make-or-break point of every ultra ride: you'll be stopped every 10--20 miles for a vet to check your horse's heart rate, hydration, leg soundness, and gut sounds. If your horse fails any of these checks, you're out of the competition immediately. During every training ride longer than 10 miles, practice stopping at regular intervals and running through the full vet check routine:
- Time how fast your horse's heart rate drops below 64 bpm after stopping (the standard pass mark for most 100-mile rides)
- Pinch the skin on their neck to check for dehydration, and run your hands down all four legs to check for heat or swelling. Make these stops positive: give them a small treat and a quick groom, so they don't associate stopping with being held back or punished. Also, train them to stand calmly while the vet works: no fidgeting, no nipping, no dancing around. A calm, well-trained horse will pass checks faster, and you won't lose valuable time waiting for them to settle down. Schedule a full pre-ride vet exam 2 weeks before the event to rule out any underlying joint, tendon, or heart issues that could flare up mid-ride.
Gear Prep: Test, Break In, and Pack Smart
Even the fittest, best-trained horse will struggle if their gear is ill-fitting or breaks mid-ride, and the same goes for your own equipment.
Horse Gear: Non-Negotiable, Broken-In Essentials
Saddle fit is the #1 cause of ride-ending injuries for both horse and rider. Even a small pressure point that's fine for a 2-hour trail ride will turn into a gaping sore after 12+ hours in the saddle. Get a professional saddle fitter to assess your saddle 1 month before the ride, make sure the tree matches your horse's back shape, there's no bridging across the withers, and the bars don't rub their shoulders. If you need a new endurance saddle, buy it 3 months out and break it in gradually with short rides, so the leather softens to your horse's back before race day. Add a moisture-wicking half-pad to prevent rubbing, especially in humid conditions where sweat builds up under the saddle.
- Hoof protection : If your horse is barefoot, make sure their soles are fully conditioned to rocky, abrasive terrain 2 months out, and pack a lightweight hoof boot as a backup if they step on a sharp rock mid-ride. If they're shod, work with an endurance-focused farrier to use lightweight, forged shoes with traction inserts, and make sure nails are set deep enough that they won't pull out if your horse steps on a loose rock. Pack a small hoof repair kit in your saddle bag: a hoof boot, zip ties, and a tube of super glue rated for hoof repair, so you can fix a pulled shoe on the trail without calling for help.
- Comfort and safety add-ons : Use a neoprene or sheepskin-lined girth to prevent rubbing along your horse's barrel, and make sure it's tight enough that it doesn't slide when you're trotting over rough terrain, but not so tight it cuts off circulation. Add a crupper if you're riding in steep mountainous terrain, to keep the saddle from sliding forward on downhill stretches. Avoid heavy, bulky leg boots: opt for lightweight, breathable brushing boots that won't cause your horse's legs to overheat on hot days. Pack a lightweight cooling sheet and a portable sprayer for your support crew to use at vet checks, to bring your horse's core temperature down quickly in hot weather.
Most importantly: test every piece of horse gear during training rides. Don't wear a brand new girth, saddle, or pair of boots on ride day---you won't know if they rub until it's too late.
Rider Gear: Prioritize Comfort and Reliability Over Flash
Your gear needs to hold up to 12+ hours of constant movement, rain, cold, heat, and maybe a few unexpected spills. First, break in every single item weeks before the ride: new riding boots will give you blisters that will make you want to quit by mile 20, a new saddle pad will chafe your legs, and a new backpack will dig into your shoulders after a few hours.
- Test your hydration system thoroughly: if you use a camelbak, make sure it doesn't leak, and practice drinking from the tube while you're trotting so you don't have to fumble with it when you're exhausted.
- Layer your clothing to match variable conditions: avoid cotton at all costs (it stays wet and cold if it rains, or overheats you in the sun), opt for moisture-wicking base layers, a lightweight waterproof shell, and an insulated vest for cold pre-dawn starts.
- Pack a high-lumen headlamp with extra batteries for night riding sections, plus a backup saddle-mounted light in case your headlamp dies. Navigation is non-negotiable: don't rely on your phone, which will die if you're out for 24 hours. Pack a physical map and compass, or a rugged, mounted GPS device that you can check without taking your hands off the reins.
- Most importantly, pack a personal locator beacon (PLB) or satellite communicator: most ultra rides are in remote areas with no cell service, and a PLB can be a lifesaver if you get lost or injured. Toss in a small personal first aid kit too: blister pads, antiseptic wipes, pain reliever, allergy meds, and a tourniquet if you're riding in snake or spider country.
Pre-Ride Logistics That Eliminate Last-Minute Stress
A lot of riders focus only on the horse and gear, but logistics can make or break your ride. If you have a support crew, meet with them 2 weeks before the ride to walk through the entire course, tell them exactly what your horse needs (what electrolytes they like, how to apply a hoof boot, what treats they prefer) and what you need at vet checks (extra water, snacks, a change of clothes). If you're riding self-supported, practice packing your saddle bags 2 weeks before the ride, balancing weight evenly on both sides so it doesn't throw off your horse's gait. Weigh every item you pack: every extra pound is extra weight your horse has to carry for 100 miles, so cut anything you don't absolutely need. Do a full mock ride 2 weeks before the event: load your horse into the trailer at 4am, ride 10 miles, stop for a mock vet check, switch out gear, ride another 10 miles, so you know exactly what to expect and don't have any surprises on ride day. The week before the ride, double-check all your gear: make sure your trailer tires are inflated, your hydration system doesn't leak, your horse's shoes are tight, and you have all the paperwork (vet records, ride entry confirmation) you need.
Rookie Mistakes That Will End Your Ride Early
- Testing new gear or supplements on ride day : A new electrolyte blend could give your horse diarrhea, a new saddle pad could rub a sore in 2 hours. Test everything during training rides first.
- Pushing fitness too hard right before the ride : Overworking your horse in the 2 weeks before the event will leave them fatigued and more prone to injury. Stick to the taper plan.
- Packing too much heavy gear : It's tempting to bring "just in case" items, but every extra 5lbs in your saddle bag adds up over 100 miles. Only pack what you absolutely need.
- Skipping mock vet check drills : If your horse won't stand still for a vet, you'll lose time and may fail a gate if they won't let the vet check their heart rate or legs.
- Ignoring your horse's signals : If they're limping, refusing to drink, or breathing hard long after you stop, pull out of the ride. There's always another race, but pushing an injured or sick horse can cause permanent damage.
At the end of the day, ultra-endurance isn't about being the fastest rider across the finish line. It's about building a partnership with your horse that lets you tackle grueling miles together, trust each other to make smart calls when things go wrong, and cross the finish line sound, happy, and proud of what you've accomplished. That first time you and your horse trot across the finish line together, both of you covered in sweat, ears pricked forward, it's worth every early morning training ride, every hour spent breaking in gear, and every moment of stress prepping for the big day. Start small with 25-mile novice rides first, build up gradually, and you'll be ready to tackle those ultra distances before you know it.