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⏵ Course guide · Montana ultra

Yellowstone Trail 50K Course Guide

The Yellowstone Trail 50K runs on the Rendezvous Ski Trails right at the west gateway to Yellowstone, and it is a different animal than the big-climb mountain 50Ks. The profile is rolling and runnable with no monster ascent, so the real challenge here is altitude, footing, and holding it together over a loop you will see more than once. I will walk you through the course first, then give you a pacing and fueling plan that fits the thin air and the long, even effort. There are free calculators along the way to dial in your own numbers.

⏵ At a glance

Yellowstone Trail 50K quick facts

Date
Saturday, July 11, 2026 (a summer weekend, confirm the year)
Location
Rendezvous Ski Trails, West Yellowstone, Custer Gallatin National Forest, MT
Distances
Marathon, 50K, 25K, Half Marathon, 10K, 5K (the 50K is the ultra)
Elevation gain
50K: about 2,090 ft · 25K: about 1,045 ft · 10K: about 400 ft (rolling, no big climb)
Start
9:00 AM MDT (all distances)
Cutoff
Roughly an afternoon course limit (about 5:00 PM); confirm the current cutoff
Altitude
High and dry: West Yellowstone sits near 6,600 ft, and you run there the whole way
Qualifier
No Western States, UTMB, or Hardrock qualifier status listed by the race

These facts come from the official race (Wolf Pack Productions / RunSignUp) and Destination Yellowstone. Check the current date, cutoffs, and aid stations in the race-day details before you commit. Race logistics change year to year.

The course: where the Yellowstone Trail 50K is won and lost

The 50K is built on the Rendezvous Ski Trail system, about 31 miles and roughly 2,090 feet of gain on a friendly, well-marked footbed. You start on a closed double track, hop onto Whiskey Springs Road (a quiet Forest Service road) for a few easy miles, then drop into the rolling shaded singletrack. Because the loop is shorter than the distance, you will run it more than once, and that repetition is part of the puzzle.

The altitude: the climb you can’t see on the map

There is no big mountain here, but there is a quiet one, and it is the air. West Yellowstone sits near 6,600 feet and you run at that elevation the entire day, so your normal pace will feel a notch harder than it should and your heart rate will sit higher for the same effort. This is the single most important thing to plan for. If you treat your flat-ground splits as gospel and push early, the altitude collects the debt later and the back half falls apart.

If you live at sea level, the smart move is to either arrive a few days early to let your body start adjusting, or accept that you are racing on day one or two and run conservatively by feel. Either way, run the first half like you are leaving time on the table. You are not. You are buying yourself a back half that still has legs.

Rolling, runnable, and relentless

The terrain itself is kind: packed dirt and pine needles, shaded ski trail, with the elevation coming in a steady stream of short ups and downs rather than one long climb. There is nothing technical to fear, no scrambling, just a solid surface you can run almost all of. That sounds easy, and it is the trap. A course with no walking breaks built in by the terrain means you have to create your own discipline, hiking the steeper bumps on purpose to save your legs instead of grinding every little rise because you can.

Mixed in are short bits of bike path, pavement, and gravel near the start and the road section, so your stride changes a few times early. Settle into a rhythm, keep your effort flat, and let the rolling trail come to you.

The loop and the mental game

Because the 50K covers the loop more than once, you will pass familiar ground, and that is where the race gets mental. The first time through feels fresh. The second time, you know exactly how long the climbs are and exactly how far the aid is, and that knowledge can wear on you. Break the day into the loops and aid-station segments instead of staring at 31 miles, and have a couple of small jobs for the low patch (drink, eat, reset your form) so you have something to do besides think.

Aid is limited out here, often a water stop and one fuller aid station per loop, so you are responsible for carrying what you need between them. This is also genuine bear country, with elk, bison, and moose around and the occasional bear, and the Forest Service recommends every runner carry bear spray. Treat that as part of your kit, not an afterthought.

Pacing strategy for a high-altitude, rolling 50K

With only about 2,090 feet of gain and no big climb, this is not a course where you survive one ascent. It is a course where you hold an even, honest effort for hours at altitude. Pace by feel and breathing, not by the pace you would run this profile at sea level.

Run the air, not the watch

Your flat sea-level pace lies to you up here. At 6,600 feet the same effort comes out slower, so anchor to breathing and perceived effort and let the pace be whatever it is. A grade-adjusted pace helps you see what the rolling terrain is actually doing to your splits so you do not over-read a slow uphill mile or burn a fast downhill one. The classic mistake on a friendly profile like this is running the whole thing because nothing forces you to walk, then fading hard once the altitude adds up. Hold back early on purpose.

Build a realistic finish window

Do not set your goal off a flat road 50K time. The altitude alone can add real minutes across 31 miles even with the gentle climbing, so build a finish prediction that accounts for this course’s vert and then pad it for the thin air. Working back from a realistic window also tells you how much buffer you have against the afternoon cutoff at each loop, which on a forgiving course like this is usually plenty, but it is worth knowing rather than guessing.

⏵ Free tools to pace this course

  • Grade-adjusted pace calculator to read what the rolling ups and downs do to your real splits so you can hold an even effort.
  • Race-time calculator for a vert-aware finish prediction on this course, so you can plan against the cutoff with the altitude in mind.
  • Race-equivalent calculator to turn a recent race result into a Yellowstone Trail 50K goal you can actually hold at elevation.

Fueling strategy for altitude and a long, even effort

Most runners are out on the Yellowstone Trail 50K for somewhere around 5 to 8 hours at altitude, with limited aid and dry mountain air. That makes carbohydrate, sodium, and steady fluid every bit as important as fitness.

Carbs: steady, and don’t let the altitude talk you out of eating

Aim for roughly 60 to 90 grams of carbohydrate per hour, and only push the top end if your gut is trained for it. Altitude has a way of killing your appetite and making food feel like a chore, so the danger is quietly under-eating until you bonk. Keep your intake on a clock, lean on things that go down easy, and practice your exact race-day carb rate on long runs (ideally some at elevation) so it feels normal rather than like a fight.

Sodium and fluid: the dry air takes more than you think

The mountain air up here is dry, and you lose water through your breath and sweat faster than your thirst will admit, so sip steadily from the start instead of waiting until you feel parched. Add sodium in the usual 300 to 700 mg per liter range, toward the high end if you sweat heavily or salty. Because aid is spaced out, carry enough fluid and calories to cover the gaps between stations on your own. Weigh yourself before and after a long run to learn your real sweat rate, then build the plan around your own number.

⏵ Build your fueling plan

Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and the dry high-altitude 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 Yellowstone Trail course profile, and your projected splits. Summit Line reads your real training, builds a plan for the rolling miles and the altitude, and rehearses your fueling so race day is something you execute, not guess at.

Start free →Explore the demo

Yellowstone Trail 50K FAQ

How hard is the Yellowstone Trail 50K?

It is a real 50K, but the hard part here is not a giant climb. The course covers about 31 miles on the rolling Rendezvous Ski Trails with only around 2,090 feet of total gain and no long sustained climb or descent, so on paper the profile is friendly. What makes it tough is the altitude: you are running near 6,600 feet the whole day, which quietly slows everyone down and punishes anyone who goes out hard. Add the mental grind of running the loop more than once and a high mountain sun, and a course that looks easy turns into an honest day out.

How much climbing is in the Yellowstone Trail 50K?

The 50K has roughly 2,090 feet of total elevation gain spread across about 31 miles, per the race and event listings. There is no single big climb. The course rolls through the shaded ski-trail system on packed dirt and pine needles, with the gain coming in lots of short, steady ups and downs rather than one summit push. For comparison the 25K is about 1,045 feet and the 10K about 400 feet, so the per-mile climbing is fairly gentle by trail-ultra standards.

How should I fuel for the Yellowstone Trail 50K?

Treat it as a 5 to 8 hour high-altitude effort. Most runners do well on roughly 60 to 90 grams of carbohydrate per hour, leaning to the higher end only if your gut is trained for it, because altitude tends to blunt your appetite and slow your stomach. The air up here is dry and you lose more water than you think, so keep sipping even when you do not feel thirsty and add sodium (often the 300 to 700 mg per liter range, more if you are a salty sweater). Aid is limited, so carry your own calories and fluid between stations and run your exact numbers with the free ultra fueling calculator.

What are the cutoff times for the Yellowstone Trail 50K?

The event uses an afternoon course limit, recently listed as needing to finish your event by about 5:00 PM, with the marathon also having an early first-loop cutoff (around 1:00 PM). The 50K starts at 9:00 AM, so that gives most runners a generous window for 31 rolling miles. Cutoffs and start logistics shift year to year and by distance, so confirm the current 50K time limit in the race-day details before you start.

What is the terrain and weather like at the Yellowstone Trail 50K?

The course starts on a closed double track, drops onto Whiskey Springs Road (a quiet Forest Service road) for a few miles, then settles into the rolling, shaded singletrack of the Rendezvous Ski Trails with a solid footbed of packed dirt and pine needles. It is mostly very runnable with a bit of bike path, pavement, and gravel mixed in, and no technical scrambling. July in West Yellowstone can swing from a cold high-country morning to a warm, bright afternoon with strong sun and the chance of an afternoon thunderstorm, so plan layers and sun protection. This is also bear country, and the Forest Service recommends every runner carry bear spray.

Is the Yellowstone Trail 50K a good first 50K?

Yes, it is one of the friendlier 50K courses to pick for a first ultra, as long as you respect the altitude. The footing is good, the climbing is gentle and spread out, and the cutoff is forgiving, so a prepared runner has room to walk the ups, settle in, and finish. The two things that catch first-timers are the thin air, which makes your normal pace feel harder, and the loop format, which is a mental test. Train your easy pace by effort, get a couple of days at altitude before the race if you can, and rehearse your fueling, and this is a very achievable first 50K.

This guide is independent and for planning only. The course details, dates, cutoffs, and aid stations 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.