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How to Train for a Backyard Ultra

A backyard ultra is dead simple and completely unhinged: every hour, on the hour, you run the same 4.167 mile loop, and whoever runs the last loop that nobody else finishes wins. There is no set distance and no finish line you run toward, just loop after loop until one runner is left. So you do not train for a time or a place, you train to be relentlessly repeatable: a huge easy aerobic engine, a steady lap-and-rest rhythm of around 48 to 52 minutes a loop, a fast pit routine, small constant fueling, and a head that can keep answering one question, can I do the next loop. This guide breaks down how the format actually works and exactly how I would train for it.

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How the yard format works

Before you train for it you have to really get the format, because it changes everything about how you prepare. There is no distance to cover and no clock to beat to a finish. There is only the next loop, forever, until one person is left. Here are the numbers that define it.

Rule	Number	What it means
Loop ("yard") distance	4.167 mi (6.706 km)	A new yard starts every hour, on the hour. That exact distance is picked so one loop an hour for 24 hours adds up to exactly 100 miles in a day.
Loop cutoff	60 minutes flat	You have to be back and at the start corral before the next hour bell. Finish early and the leftover time is your rest. Cross late, or miss the bell, and you are out.
Cutoff pace	~14:23 / mi (~8:57 / km)	The slowest you can move and still close the loop inside the hour with zero rest. Run that pace and you get no break, so nobody actually races at it.
24 hours =	100 mi / 161 km	Twenty-four straight yards is a flat hundred. It keeps going from there: 48 yards is 200 miles, and the clock never stops until one runner is left.
How it ends	Last runner standing	There is no finish line you run toward. The race ends when one runner completes a loop that nobody else finishes. That person is the only official finisher. Everyone else is a DNF.

The whole thing is the brainchild of Gary "Lazarus Lake" Cantrell, who also created the Barkley Marathons, so yes, the cruelty is the point. The current world record sits at 119 yards (just under 496 miles), but most local races are won somewhere in the 12 to 30 loop range, and a hundred miles (24 yards) is a fantastic first goal.

The lap-and-rest sweet spot

This is the central decision of the whole race, and it is a tradeoff. Run the loop fast and you earn more rest, but you spend more of your legs and your fuel doing it. Run it slow and you save energy, but you barely get off your feet between bells. The runners who go furthest land in a narrow band, not at either extreme.

Loop time	Rest you get	The honest read
42 to 45 min	~15 to 18 min	Too hot to hold for days. Buys a real nap but it shreds your legs and drains glycogen fast. Fine as a one-off to grab sleep, a bad default.
48 to 52 min	~8 to 12 min	The sweet spot, and where the runners who go furthest live. Easy enough to repeat for a very long time, with just enough rest to eat, reset, and move on.
53 to 56 min	~4 to 7 min	You are barely getting off your feet. Not enough time to fuel and recover, and you are one bad stomach or shoe change from missing the bell.
57+ min	~0 to 3 min	No margin at all. A single trip, blister stop, or wrong turn and you DNF. Reserve this for the very end when you are just trying to outlast one person.

In the big race-data sets, winning loop times cluster right around 49 to 51 minutes on average, with the occasional faster loop thrown in to steal a nap. The rule of thumb: hour one should feel almost embarrassingly easy. If it feels like a workout early, you are going to blow up. To sanity-check your loop pace on a hilly course, run it through the grade-adjusted pace calculator so the climbs do not quietly cook you.

How to train: by time, not miles

Here is the mindset shift. A yard race is measured in hours on your feet, so train in hours on your feet. The goal is not to get fast, it is to become repeatable: an aerobic engine that can produce the same easy loop again and again while you are tired, fed, and a little sleep-deprived. Give yourself about 12 to 16 weeks if you already have an ultra base under you.

Block	What you do	Why it matters
Weeks 1 to 6: Base	Easy aerobic volume by time, mostly Zone 2, plus 2 strength sessions a week.	Build a big, boring engine. Long run grows in steady steps. No speed yet, just time on feet that finishes with something left.
Weeks 7 to 12: Build	Hold volume, add back-to-back long days on the weekend and your first loop simulations.	Saturday long, Sunday long-on-tired-legs. Start running short, repeated loops with quick stops so the rhythm and the transition become muscle memory.
Weeks 13 to 14: Specificity	Your biggest yard simulation: 6 to 12+ loops at race effort, including the overnight.	One full dress rehearsal. Real loop pace, real fueling, real transitions, real headlamp, in the dark. This is where you learn what actually breaks.
Weeks 15 to 16: Taper	Cut volume hard, keep a little intensity and a couple of easy loops, sleep a ton.	Bank rest, not fitness. Show up fresh and bored, with legs that want to run, not legs that are already cooked from a huge final block.

Big aerobic base, then back-to-backs, then loop sims

Most of your running should be genuinely easy, Zone 2, the kind of effort where you can hold a full conversation and finish with gas left. That is the engine that lets you repeat loops for a day or more. Anchor the plan to a 100K or 100 mile build if you want a template, but track everything by time instead of distance, because that is the currency of the race.

The weekend back-to-back long days are the secret sauce. A long run Saturday, then another long run Sunday on tired legs, teaches your body and your head to keep moving through fatigue, which is the entire skill of a yard race. Then in the last month, start running actual loop simulations: short repeated loops with quick stops at the top of each one, so the rhythm and the transition stop being something you think about and become something you just do.

Strength matters here more than people expect, because the damage in a backyard ultra is repetitive, not explosive. Two sessions a week of step-ups, split squats, deadlifts, calf raises, loaded carries, and core builds tissue that can soak up thousands of identical foot strikes without falling apart. I would not skip it.

For the aerobic and base-building details behind this, base building for ultrarunning and Zone 2 and heart-rate training are the two companion reads, and strength training and injury prevention covers the lifting in full.

Nail the between-loop transition

The loop is the obvious part. The transition is where yard races are quietly won and lost. You have maybe 8 to 12 minutes between bells to do everything: eat, drink, refill, fix your feet, hit the bathroom, grab a layer, and get your body and brain to the corral on time. Do it sloppily and the mistakes compound until one of them costs you the bell.

Same chair, same order, every single loop

Build a fixed routine and run it identically every hour: walk in, sit in the same spot, drink, eat the next thing, handle feet or gear if needed, stand up with a minute or two to spare, walk to the line. When you do the same sequence every loop, it survives the moment at hour eighteen when your brain is mush and cannot make decisions anymore. Decision-making is the first thing to go, so remove the decisions ahead of time.

A crew is a massive advantage here, even one person. Your crew is your pit crew, cook, and the calm voice that talks you back out the door when you start bargaining with yourself. Lay your stuff out in the same place, label drop bags, and give the crew a simple script for each loop so neither of you is improvising at 3am. And do not sit and chat. The corral fills with people who feel fine right up until they do not get back up.

Fuel small and often, from loop one

Yard fueling is its own beast because the race can run for a full day or longer, so this is a slow, steady drip, not a few big meals. A reasonable starting target is about 150 to 250 calories an hour, 500 to 900 mg of sodium, and 20 to 24 oz of fluid, then you adjust for your size, the heat, and what your gut will tolerate. Start eating on loop one, while you feel great, because the deficit you let build early is the one that ends you late.

Liquid and gels on the move, real food on the rest

A clean way to split it: take easy carbs you can swallow while running (drink mix, a gel) during the loop, then use the rest minutes for quick solid food. As the hours pile up, and especially once it gets dark, your appetite for sweet falls apart and your core cools off, so the plan goes warm and savory: broth, ramen, miso, mashed or boiled potatoes, salty snacks. That switch is what keeps people eating overnight when one more sweet gel would make them gag.

Whatever you plan to eat, you have to have eaten it on long runs first. Gut training is real, and the loop simulations in your last month are exactly where you find out what still goes down at hour ten. None of this should be new on race day.

To turn those per-hour numbers into an actual plan, run the ultra fueling calculator, and for the full method behind it read how to build an ultramarathon fueling plan and how to avoid stomach problems during an ultra.

The overnight and the head game

Here is the truth nobody likes: in a backyard ultra, your mind quits long before your body does. The research on these races points squarely at perceived effort, the rising urge to just stop, as the thing that decides who drops. The format is engineered to break you mentally, because there is no finish line out ahead. The end only shows up when everyone else gives up.

Shrink the race to one loop

The runners who last do not think about 30 loops or 100 miles. They think about the next bell, and nothing past it. Can I do this one loop. That is the whole race, asked and answered over and over until it is over. When a rough patch hits, and it will, a black 3am loop where everything hurts and you are bored out of your skull, that is not a sign you are done. That is the race working exactly as designed. Get to the next bell, eat something, and reassess from a chair, never from the trail.

Practice the night before you race it. Do at least one real overnight loop simulation by headlamp so you know how your body handles darkness, how slow your brain gets, and what your feet and stomach do at 2am. If you plan to nap, a faster loop (say 43 to 45 minutes) can buy you a 15-minute reset between bells, and a quick 20 to 30 minute nap can genuinely revive you without the grogginess of falling into deep sleep. Rehearse all of it. The unknown is what makes the night scary, and you can delete the unknown in training.

⏵ Train for the loop that never ends

A generic plan does not know your aerobic ceiling, your easy pace, or how your legs absorb week after week of repeated load. Summit Line builds a plan around YOUR real fitness, tracks your training by time the way a yard race is actually run, and its load-aware Build Watch flags when your volume is ramping faster than your body can take, so you arrive durable and rehearsed instead of cooked.

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⏵ Free calculators, no signup

A yard race is a math problem as much as a fitness one: loop pace, rest, and fuel per hour. These free tools help you pin your numbers before the bell.

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Keep going: related guides

Backyard ultra FAQ

What is a backyard ultra and how does it work?

A backyard ultra is a last-runner-standing race built on one simple loop, repeated. Every hour, on the hour, everyone starts a 4.167 mile loop (called a yard), and you have to finish it and be back at the corral before the next hour bell. Finish early and the leftover minutes are your rest. The trick is that one loop an hour for 24 hours is exactly 100 miles, and the race does not stop there. It just keeps going, hour after hour, until a single runner completes a loop that nobody else finishes. That person wins and is the only official finisher. Everyone else, no matter how far they got, is recorded as a DNF. The format was invented by Gary "Lazarus Lake" Cantrell, the same mind behind the Barkley Marathons.

How far do you have to run in a backyard ultra?

There is no set distance, and that is the whole point. You run as far as it takes to outlast everyone else. Each loop is 4.167 miles, so 24 hours of loops is 100 miles, 48 hours is 200 miles, and on it goes. A lot of first-timers quietly aim for 24 yards (a hundred miles) as a personal milestone, which is a great honest goal. The very top of the sport has gone almost unimaginably far: the world record is 119 yards, just under 496 miles, run over roughly five days. Most local backyard ultras are won somewhere in the 12 to 30 yard range, so think in terms of how many loops you can repeat, not a finish-line distance.

How should I pace each loop in a backyard ultra?

Steady and easy, with the goal of buying yourself enough rest without burning your legs. The slowest you can run and still beat the hour with no break is about 14:23 per mile, but nobody races that pace because it leaves zero rest. The runners who go the furthest tend to cluster around 48 to 52 minutes per loop, which leaves roughly 8 to 12 minutes to refuel and reset every hour. Going faster than about 45 minutes buys more rest but burns through your legs and glycogen way too fast to sustain for days. Going slower than about 55 leaves you almost no time to eat, fix your feet, or hit the bathroom, and one small problem can knock you out. Pick a pace that feels almost too easy in hour one, because it has to feel sustainable in hour twenty.

How do I train for a backyard ultra?

Train for repeatability, not speed. The engine you want is a big aerobic base, so the bulk of your running should be easy Zone 2 effort where you could hold a conversation. Plan by time, not miles, because the race is measured in hours on your feet. Give yourself about 12 to 16 weeks if you already have an ultra base, build your long runs in steady steps, then add back-to-back long days on weekends so you learn to keep moving on tired legs. Lift twice a week (step-ups, split squats, deadlifts, calf raises, carries, core) so your body can soak up the repetitive load. In the last month, run a few loop simulations: short, repeated loops with quick stops, including at least one real overnight session by headlamp, so the rhythm and the transition are second nature by race day.

How do I fuel a backyard ultra?

Small and often, every single loop, before you think you need it. A common starting point is roughly 150 to 250 calories an hour, somewhere around 500 to 900 mg of sodium, and about 20 to 24 ounces of fluid, then you adjust for your size, the heat, and what your gut will take. Early on, lean on easy liquid carbs and gels you can take while moving, and use the rest minutes for quick solid food. As the hours stack up, especially overnight, your appetite for sweet falls apart, so shift to warm and savory: broth, ramen, mashed potatoes, salty snacks. The mistake that ends a lot of yard races is under-eating early while you feel fine, then trying to claw back a deficit at hour fifteen when your stomach has already checked out. Eat steadily from loop one and you protect the back half.

Why do most people quit a backyard ultra?

Almost always the mind quits before the body does. The research on backyard ultras points at perceived effort, the mounting urge to stop, as the clearest factor in who drops, which lines up with the psychobiological model of endurance. The format is built to mess with your head: there is no finish line to run toward, only an abstract end that appears whenever everyone else gives up. The runners who last are the ones who shrink the race down to a single question, can I do the next loop, and then answer it over and over. Boredom, a rough patch, a cold dark 3am loop, none of that means you are done. It usually means you are exactly where the race is supposed to feel awful. Get to the next bell, and reassess from there.

This guide is for training and planning purposes and reflects current backyard-ultra race data, coaching practice, and general sports-science consensus. It is not medical advice. The format numbers are fixed by the race, but pacing and fueling are individual: test your loop pace, your transition, and your nutrition in training, build your volume gradually, and talk to a qualified professional before a big change, especially if you have a medical condition.