Summit Line

⏵ Course guide · New Mexico ultra

Bosque Bigfoot Trail Runs Course Guide

The Bosque Bigfoot Trail Runs is a flat, fast little ultra down in the Rio Grande Bosque in Albuquerque, run as repeating 8-mile loops through the cottonwoods on dirt and jeep road. It is low-key, it is friendly, and it is one of the best first-50K options in New Mexico. Flat is not the same as easy though, so I will walk you through the course and the loop, then give you a pacing and fueling plan that fits a course with no climbs to hide on. Free calculators along the way let you dial in your own numbers.

⏵ At a glance

Bosque Bigfoot quick facts

Date
Saturday, November 28, 2026 (late November, day after Thanksgiving weekend)
Location
Pueblo Montaño trailhead, Montaño Rd NW, Albuquerque, Bernalillo County, NM
Distances
50K, 16-mile, and 8-mile, all on the Rio Grande Bosque
Elevation gain
Essentially flat river-bottom course (advertised as fast and flat); no per-distance figure published
Start
50K at 8:00 AM · 16-mile at 8:30 AM · 8-mile at 9:00 AM
Cutoff
50K finishes by 5:00 PM (about a 9-hour limit); confirm any intermediate cutoffs
Format
8-mile loops run washing-machine style; the 50K hits the aid station 4 times (about 8 mi apart)
Qualifier
No Western States, UTMB, or Hardrock qualifier status listed by the race

These facts come from UltraRunning, UltraSignup, and RunGuides (the race is put on by RaceNM). Check the current date, start times, cutoffs, and loop details in the official race-day info before you commit. Logistics change year to year.

The course: where Bosque Bigfoot is won and lost

The whole event runs on an 8-mile loop along the Bosque trail system next to the Rio Grande, out of the Pueblo Montaño trailhead. You run it washing-machine style, so the 50K is roughly four passes and you come back through the aid station about every 8 miles. It is flat, it is runnable, and it is genuinely scenic in the cottonwoods. What makes it a real race is not vert. It is pacing discipline, footing, and your head.

The loop: flat, runnable, and repeating

There is no big climb here to set the day around, which flips the usual ultra script. Instead the day is about holding an honest, even effort on ground you can run the entire time, lap after lap. Because you pass the aid station every 8 miles or so, the loop keeps you close to fluids, food, and your drop bag, which is a gift for a first-timer. The flip side is that nothing forces you to slow down, so it is on you to keep the pace honest early instead of letting a fast course pull you out too hard.

Break the race into loops in your head, not into 31 miles. One loop at a time, each one a small reset at the aid station, is a far easier thing to manage than staring down a 50K. The runners who fall apart out here are usually the ones who treated the first lap like a 10K.

Footing: roots and sand, not rocks

Do not let "flat and non-technical" fool you into thinking the trail is a sidewalk. It is Bosque dirt with roots in places and patches of soft, loose sand that quietly tax your legs and slow your turnover. None of it is dangerous, but tired feet late in the day catch roots, and grinding through sand over and over adds up across four loops.

Run in trail shoes you trust on dry, loose ground, and practice on soft surfaces before race day so the sand does not surprise your calves. Keep your feet a little quicker than you would on pavement and you will glide over the rooty bits instead of stubbing through them.

The mental game of a flat loop

This is the part nobody warns first-timers about. A flat, repeating loop is mentally harder than a big mountain course for a lot of people, because there is no summit to chase and the scenery repeats. The miles can blur, and around the third loop is where the doubt usually creeps in.

Have a plan for your head, not just your legs. Chunk the race loop by loop, give yourself small jobs at each aid station, and save a podcast or your favorite playlist for the back half when you need it. Knowing the lows are coming and having a response ready is most of the battle on a course like this.

Pacing strategy for a flat, fast 50K

With no climbs to throttle your effort for you, Bosque Bigfoot is all about discipline. The fast, flat profile means you can actually target a time here, but it also means the only thing stopping you from going out too hard is you. Pace the early loops by feel and let the speed come at the end.

Hold back early, even when it feels too easy

On a flat 50K the classic blowup is starting at a pace that feels comfortable for a 10K and paying for it on the last loop. Pick an effort you could honestly hold for hours and sit just under it for the first two loops. If you have raced a flat marathon or a road 50K, your fitness translates pretty cleanly here, so use that to set a realistic target instead of guessing off how good you feel at mile 3.

A small walking break through the aid station each loop, even on a course where you could run it all, keeps your legs and your stomach fresher than grinding nonstop. Build those tiny resets in on purpose.

Build a finish prediction off your real fitness

Because this course is flat and runnable, your flat-race fitness is a good predictor, which is not something you can say about most ultras. Turn a recent road or flat-trail result into an honest Bosque Bigfoot target and then work backward into the loops so you know what each lap should take. With that, the generous 5:00 PM cutoff stops being a worry and becomes a number you can pace against.

⏵ Free tools to pace this course

  • Grade-adjusted pace calculator so you know what your honest flat pace really is and can hold an even effort through the sandy, rooty stretches.
  • Race-time calculator for a realistic finish prediction on this flat course, so you can plan each loop against the 5:00 PM cutoff.
  • Race-equivalent calculator to turn a recent road or flat-trail result into a Bosque Bigfoot goal you can actually hold.

Fueling strategy for a steady, no-walking effort

Most runners are out on the Bosque Bigfoot 50K for somewhere around four to seven hours, running nearly the whole time. There are no long climbs to digest on, so your gut has to keep up with a steady effort. The good news is you hit the aid station every loop, so a plan is easy to execute.

Carbs: steady and trained for a running gut

Aim for about 60 to 90 grams of carbohydrate per hour, and only push the higher end if your gut is trained for it. On a flat course you are working continuously instead of hiking the steep bits, and a hard-running stomach is fussier than a hiking one, so keep your intake steady and easy to get down rather than gambling on big late doses. Practice your exact race-day carb rate on flat long runs so 80 grams an hour feels routine, not like an experiment on race morning.

Hydration and sodium: use every loop

Late November in Albuquerque is usually cool and dry, so you will not sweat like a summer race, but the high-desert air is thirsty and easy to underestimate. Sip steadily and top off your fluid and a bit of salt at the aid station every loop, since it comes around so often there is no reason to ration to empty. Weigh yourself before and after a long run to find your real sweat rate and set sodium from your own number rather than a default, especially if you run salty.

⏵ Build your fueling plan

Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and a flat, steady effort 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 flat Bosque Bigfoot loop, and your projected splits. Summit Line reads your real training, builds a plan for a fast and steady 50K, and rehearses your fueling so race day is something you execute, not guess at. It is a great way to make your first ultra go right.

Start free →Explore the demo

Bosque Bigfoot Trail Runs FAQ

How hard is the Bosque Bigfoot 50K?

It is one of the friendlier 50Ks you can pick, but flat is not the same as easy. The course runs along the Rio Grande Bosque on dirt paths and jeep road, essentially flat the whole way, with some roots and sand but nothing technical. There are no climbs to break up the rhythm, so the hard part is staying mentally engaged on a repeating loop and not letting a fast, no-walking course wreck your legs and your stomach. The 8:00 AM start and 5:00 PM cutoff give you about nine hours, which is generous for 31 miles on terrain this runnable.

How much climbing is in the Bosque Bigfoot Trail Runs?

Almost none. This is a flat river-bottom course down in the Bosque along the Rio Grande, advertised as fast and flat, so you can basically run the whole thing. The race does not publish a per-distance elevation figure, but expect very little net gain across the 50K, the 16-mile, or the 8-mile. That makes it a true PR-shaped 50K and a great first ultra, but it also means no built-in hiking breaks, so you have to schedule your own.

How should I fuel for the Bosque Bigfoot 50K?

Because you are running almost the entire time, your stomach has to keep up with a steady effort for roughly four to seven hours, with no slow climbs to digest on. Most runners do well on about 60 to 90 grams of carbohydrate per hour, leaning higher only if your gut is trained for it. The aid station comes around every 8 miles or so, so carry enough to bridge each loop comfortably instead of arriving empty. Run your own numbers for your weight and goal time with the free ultra fueling calculator.

What are the cutoff times for the Bosque Bigfoot 50K?

The 50K starts at 8:00 AM and the course closes at 5:00 PM, which is about a nine-hour overall limit. That is roomy for a flat 50K, so most prepared runners finish with time to spare. There may be intermittent loop or aid-station cutoffs on the day, so confirm the current race-day details before you start. The 16-mile and 8-mile start later in the morning on the same course.

What is the terrain and weather like at Bosque Bigfoot?

The course is on the Bosque trail system along the Rio Grande, a mix of single track and jeep road through the cottonwoods. It is non-technical, but you will hit roots and patches of soft sand that sap a little energy and ask for steady feet. Late November in Albuquerque is usually cool and dry, often cold at the 8:00 AM start and warming through the day, with strong high-desert sun once it climbs. Dress for a chilly start you can shed and plan for dry, dusty trail.

Is the Bosque Bigfoot 50K a good first 50K?

Yes, it is one of the better first-ultra options out there. The flat, runnable course, the loop format that keeps you near aid and your drop bag, and the generous cutoff all stack in a first-timer’s favor. The thing to respect is that flat and fast can tempt you to start too hard, and the repeating loops can get mentally dull, so practice steady pacing and a fueling plan you can hold for hours. Train the duration and the gut, break the race into loops, and most committed first-timers finish comfortably.

This guide is independent and for planning only. The course details, dates, start times, cutoffs, and loop format come from public sources and can change year to year, 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.