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⏵ Course guide · New Mexico ultra

Land of Enchantment Backyard Ultra Course Guide

The Land of Enchantment Backyard Ultra is New Mexico’s last-runner-standing race, run on crushed-gravel desert trails at Prehistoric Trackways National Monument in the Robledo Mountains near Las Cruces. You run a 4.167-mile loop every hour, on the hour, until one person is left. The loop is friendly. The format is the opponent. I’ll walk you through how the backyard game works and where it is won and lost, then give you a pacing and fueling plan built for the hourly clock. There are free calculators along the way to dial in your own numbers.

⏵ At a glance

Land of Enchantment Backyard Ultra quick facts

Date
Friday, October 30, 2026 (inaugural Day of the Dead edition)
Location
Prehistoric Trackways National Monument, Robledo Mountains, near Las Cruces, NM
Format
Backyard ultra (last runner standing): a 4.167-mile loop started every hour, on the hour
Distance
Open-ended. 24 yards = 100 miles; the race runs until one runner finishes a yard alone
Start
7:00 AM MDT, first yard sharp on the hour
Cutoff
One hour per yard. Miss the next start corral and you are out (recorded as DNF)
Surface
Crushed-gravel trail, some elevation change, Organ Mountains views; trekking poles not allowed, cupless aid
Qualifier
No Western States, Hardrock, or UTMB qualifier status listed by the race

These facts come from the official registration and the Las Cruces listings. A backyard has no fixed finish, so check the current date, start time, and format rules in the race-day details before you commit. Race logistics change year to year.

The format: where a backyard is won and lost

Forget pace charts and a finish line. This race is a 4.167-mile lollipop loop on crushed gravel, started every hour on the hour, with scenic Organ Mountains views and some gentle elevation change. Finish the loop, get back to the corral before the next bell, repeat. The person who completes one more yard than everyone else, alone, wins. Everyone else takes a DNF. That single rule shapes the entire day and night.

The yard itself: run it easy, bank your rest

A single 4.167-mile lap of well-kept desert trail is not hard. The whole skill is running it slow enough to last and fast enough to rest. If you cruise each yard and roll back into camp with eight or ten minutes to spare, you get to sit, eat, deal with your feet, and reset before the next start. If you race the loop and crawl back with thirty seconds left, you never recover, and the format eats you alive a few hours later.

My rule of thumb here: treat the early yards as almost insultingly easy. Walk the runnable parts if you want. The runners who blow up at a backyard almost always went too hard in the daylight hours when it felt free.

The corral and the bell: the only cutoff there is

Every hour a bell rings, with warnings at three, two, and one minute before. You have to be physically inside the starting box when it goes, not jogging up to it, not a few steps away. Miss it and you are out, full stop. There is no banking time across loops, no making it up later. Each hour resets to a clean one-hour clock, which is why a backyard is so simple to understand and so brutal to survive.

Practically, that means knowing your turnaround cold. Have your bottle, your food, and your layers laid out so the in-and-out is automatic. The clock does not care that you were tying a shoe.

The night and the desert swing: this is the real course

The terrain will not break you. The hours will. Las Cruces sits in high desert, so daytime can be warm and dry and the overnight hours can get genuinely cold, and you cycle through that swing while losing sleep and chipping away at the same loop again and again. The aid station leans into the long haul with water and Gatorade, salty-sweet snacks, pickles, wraps, and coffee in the late-night and morning hours, and it is cupless, so bring your own soft flask or cup.

No trekking poles are allowed and there is no help out on the loop, so everything that keeps you moving has to happen in the corral and your own setup. The mental game (deciding, hour after hour, to go back out) is the actual challenge of this race. Train that on purpose, not just your legs.

Pacing strategy for the hourly clock

Pacing a backyard is not about a finish time, it is about a sustainable loop split that leaves you enough rest, repeated for as long as you want to last. Pick a loop pace you could hold half-asleep, then defend your rest window like it is the prize.

Find a loop split you can hold for many hours

The hard floor is one hour per 4.167-mile yard, which is about a 14:23 per mile average if you used every second. You do not want to live anywhere near that. Aim for a loop you finish with a real cushion, often somewhere in the 45 to 52 minute range early on depending on your speed and the footing, which leaves you eight to fifteen minutes to recover. As the hours pile up your loops naturally slow, and that is fine, as long as you keep clearing the corral.

Use a grade-adjusted pace so the gentle climbs on the loop do not trick you into spiking your effort. On a course you run dozens of times, small early surges add up to a lot of wasted energy.

Set a loop goal, then a stretch goal

Because the distance is open-ended, you need a number in your head before the gun, or the format will negotiate you out the door. Decide on a loop count you are committed to no matter what (say, the 100-mile buckle at 24 yards, or whatever marker fits your training), then a stretch number for if the day is going well. A vert-aware time and effort estimate for a single loop helps you set a realistic split, and an equivalent-effort estimate off a recent race tells you honestly how many hours of repeated running your fitness can back.

⏵ Free tools to pace this race

Fueling strategy for an open-ended day and night

A backyard can run from a few hours to well over a day, so fuel it like an all-day effort but use the rest window between yards to do most of the eating. Real food, steady sodium, and not letting your appetite quit overnight are what keep you in it.

Eat in the corral, not just on the move

The big advantage of this format is that you come back to your stuff every single hour. Use it. Take in carbohydrate every loop, lean on real food your gut likes (the aid has pickles, wraps, salty-sweet snacks, and coffee, plus whatever you stash in your own drop box), and keep it going even when the overnight hours kill your appetite. Something like 150 to 300 calories per loop is a sane starting target, adjusted to what you can actually keep down when you are tired.

The runners who fall apart at a backyard usually under-eat in the dark hours, then bonk and miss a bell. Set a rule: a bite or a sip of something with calories every loop, no exceptions, even when you do not feel like it.

Sodium and fluid for dry desert air

The desert around Las Cruces is dry, so you lose more fluid than the cool night air makes it feel like, and steady sodium matters across a long day. Take in fluid and salt every loop rather than waiting until you feel thirsty, and remember the aid is cupless, so carry a soft flask or cup of your own. Weigh yourself across a long training day to learn your real sweat rate, then build your hourly plan around your own number instead of a generic one.

⏵ Build your fueling plan

Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal loop count, and the dry desert air with the free ultra fueling calculator. Browse the rest of the free running tools at the tools hub.

⏵ Train for it with Summit Line

Get a race-day plan built around YOUR fitness, this exact backyard format, and the loop count you are chasing. Summit Line reads your real training, builds the durability and back-to-back volume the hourly grind demands, and rehearses your fueling so the night is something you execute, not guess at.

Start free →Explore the demo

Land of Enchantment Backyard Ultra FAQ

How does the Land of Enchantment Backyard Ultra work?

It is a backyard ultra, which means last runner standing, not a fixed distance. Every hour on the hour you start a 4.167-mile loop, and you have to finish it and be back inside the starting corral before the next hour begins. Anyone who misses a start, or fails to complete the loop in the hour, is out and recorded as a DNF. The race keeps going hour after hour until exactly one runner completes a yard alone, and that person is the only official finisher.

How hard is the Land of Enchantment Backyard Ultra?

The single 4.167-mile loop is easy. Doing it again every hour until you break is the hard part. The trail is mostly runnable crushed gravel with some elevation change at Prehistoric Trackways National Monument near Las Cruces, so the difficulty is not the terrain, it is the format: sleep loss, the desert temperature swing, eating and managing your feet in the short rest window, and the mental grind of an open-ended clock. How far you go is up to your patience and your head as much as your fitness.

How long is each loop and how much time do I get?

Each yard is 4.167 miles, the standard backyard distance that adds up to 100 miles over 24 hourly loops. You get exactly one hour to finish each loop and get back to the corral, so the hard cutoff is roughly a 14:23 per mile average if you used the entire hour. In practice you want to run each yard comfortably faster than that so you bank a few minutes to sit, eat, change socks, and recover before the next bell.

How should I fuel for a backyard ultra like this?

Fuel it like the multi-hour or all-day effort it can become, but use the rest window between yards to do most of the eating. Real food sits better here than a steady gel drip, so use the aid (water, Gatorade, salty-sweet snacks, pickles, wraps, coffee) and your own drop box, and keep taking in carbohydrate every hour even when your appetite fades overnight. A good target is somewhere around 150 to 300 calories per loop, leaning on things your gut tolerates when you are tired, plus steady sodium and fluid for the dry desert air. Run your own numbers with the free ultra fueling calculator.

What are the cutoffs at the Land of Enchantment Backyard Ultra?

There is one rule that matters: finish each 4.167-mile yard and be inside the starting corral before the top of the next hour. There is a warning at three, two, and one minute before the bell, and if you are not in the corral when it rings, even a few steps away, you are done. That is the whole cutoff structure, repeated every hour, which is what makes the format so unforgiving and so simple at the same time.

Is the Land of Enchantment Backyard Ultra a good first ultra?

It can be, because the format is forgiving in one way: you can stop the moment you decide you are done and still have run a real distance. There is no single huge climb or technical section to fear, just a friendly desert loop you repeat. The catch is the mental side and the overnight hours, so come in with a fueling plan, warm layers for the temperature drop, a crew or drop box organized for fast turnarounds, and a number of loops you are genuinely committed to hitting before you let the format talk you out of it.

This guide is independent and for planning only. The format, date, start time, and aid details come from public sources and can change year to year, and a backyard ultra has no fixed distance, so confirm the current specifics with the official race before you register or run. The fueling and pacing advice is general and not medical advice.