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⏵ Course guide · Idaho ultra

Scout Mountain Ultras Course Guide

Scout Mountain Ultras is the big ultra weekend in Southeast Idaho, four races stacked into one event out in the Bannock and Pocatello ranges above Pocatello: a 24-miler, a 50K, a 50-miler, and a true mountain 100 that doubles as a Hardrock qualifier. Every distance climbs the Scout Mountain summit, every distance can get hit by snow, hail, or heat depending on the year, and the 100 throws a full night (or two starts in the dark) at you. I will walk you through the course first, then give you a pacing and fueling plan that fits whichever distance you are running. There are free calculators along the way to dial in your own numbers.

⏵ At a glance

Scout Mountain Ultras quick facts

Date
Friday June 5 to Saturday June 6, 2026 (early June each year)
Location
Bannock and Pocatello ranges, Caribou-Targhee National Forest, outside Pocatello, ID
Distances
100M (~102 mi), 50M (~54 mi), 50K (~36 mi), 24M (~24 mi)
Elevation gain
100M: ~21,000 to 24,000 ft · 50M: ~10,800 ft · 50K: ~7,400 ft · 24M: ~5,600 ft
Start
100M Fri 10:00 AM · 50M Fri midnight · 50K Sat 6:00 AM · 24M Sat 8:00 AM
Cutoff
All distances finish by 10:00 PM Saturday (100M about 36 hr), with intermittent aid cutoffs
Qualifier
The 100-miler is a Hardrock 100 qualifier (confirm the current year with the race)

These facts come from the official race site and UltraSignup. The courses get re-measured and the start times have moved in past years, so check the current date, distances, cutoffs, and aid stations in the race-day details before you commit. Race logistics change year to year.

The course: where Scout Mountain is won and lost

All four races live in the same high country in the Caribou-Targhee National Forest and all four put you on top of Scout Mountain, the peak the whole thing is named for, somewhere around 8,686 feet. What changes is how much of it you do. The 24-miler is one big loop, the 50K and 50-miler add more climbing and more remote trail, and the 100 strings the whole network together for roughly 102 miles and well over 21,000 feet of gain. Most distances finish down at the Mink Creek group campground.

The climbs: this is a vert race, plan for it

Scout Mountain is a climber’s course at every distance. The 24-miler still asks for about 5,600 feet of gain, the 50K around 7,400, the 50 near 10,800, and the 100 stacks 21,000-plus feet of climbing into the day. The summit of Scout Mountain near 8,686 feet is the recurring high point, and you earn it. If you treat the early climbs like flat running you will be wrecked long before the hard part. Hike the steep pitches with purpose, keep your effort even, and save your legs for later.

The footing is real mountain trail, high and remote, and the altitude alone takes a bite out of sea-level lungs. Get time at elevation if you can, and if you cannot, respect that your climbing pace up here will be slower than it is at home and plan your splits around that, not around your flatland fitness.

The descents: free speed, or a quad-killer

What goes up at Scout Mountain comes back down, and the descents are where a lot of the time is made or lost. There is real downhill off the high country, and on fresh legs it is fast and fun. Late in a 50 or a 100, on quads that have already absorbed thousands of feet of pounding, those same descents turn into a careful, painful shuffle if you did not train them. Downhill running is a skill, not a freebie, so practice controlled descending on tired legs before race day.

In a heavy snow year the high stuff can still hold snowfields, and the race may have you glissading down or routing around them depending on conditions. That is part of the charm and part of the unknown. Either way, know that the way down is not automatic and ask the aid stations or the briefing about conditions up top.

The night, the dark, and the 100-mile lows

The hundred starts Friday at 10:00 AM and the 50-miler starts at midnight, so darkness is baked into this event. For the 100 you are looking at a full night out there, maybe rolling into a second, and night running in remote mountains is its own challenge: colder, slower, lonelier, and harder on the head. Bring a real light plus a backup, layer up before you get cold rather than after, and expect the 2 a.m. low where everything feels worse than it is. Eat, keep moving, and let it pass.

This is where crew, pacers, and drop bags matter. Pacers are allowed for the 100 at the points the race designates, and a good one keeps you eating and moving through the dark patch. Pack your drop bags for the cold and the wet, not just the warm afternoon, and put a spare light, dry layers, and food you will actually eat at the crewed stops. A few minutes of organized aid beats an hour of falling apart down the trail.

Cutoffs and the long day

Everybody shares the same wall: be finished by 10:00 PM Saturday. Because the starts are staggered that works out to roughly 36 hours for the 100, about 22 for the midnight 50, near 16 for the 50K, and around 14 for the 24. That sounds generous, but the climbing and the altitude eat clock fast, and there are intermittent cutoffs at aid stations that you have to make along the way. Know the splits you need at each aid station and keep a running buffer, especially on the 100 where a slow patch in the dark can quietly put the cutoff in play.

Pacing strategy for a big-vert mountain ultra

With this much climbing and this much altitude, Scout Mountain is an effort-management race at every distance, not a pace-chart race. Run the climbs by feel, hike them without guilt, and let the watch tell you about effort, not about how fast you should be moving up a wall.

Pace by grade, not by your flat splits

Your road pace is meaningless on the Scout Mountain climbs and on the steep descents off the summit. What matters is grade-adjusted effort: a steady output you can hold up the grade, with smart power-hiking on the steep stuff, so you crest the high points with something left. The classic blowup here is hammering the first big climb because the legs feel fresh, then paying for it in the back half. Use a grade-adjusted pace to turn your real fitness into honest climbing and descending targets and you will not torch the early miles.

Build a vert-aware, distance-specific finish window

Do not guess your Scout Mountain finish off a road time or even off a flatter trail ultra. The 21,000-plus feet on the 100, the altitude, and the remote footing all add real hours, and the shorter distances carry their own heavy vert too. A vert-aware finish prediction that accounts for this course’s climbing gives you a realistic window per distance and lets you work backward into the intermittent cutoffs, so you actually know how much buffer you have at each aid station instead of hoping.

⏵ Free tools to pace this course

  • Grade-adjusted pace calculator to turn your flat fitness into honest targets for the long Scout Mountain climbs and the descents off the summit.
  • Race-time calculator for a vert-aware finish prediction on whichever distance you pick, so you can plan against the 10 PM Saturday cutoff and the aid-station cutoffs.
  • Race-equivalent calculator to turn a recent race result into a Scout Mountain goal you can actually hold.

Fueling strategy for the climbs, the altitude, and the hours

Scout Mountain is a long day no matter the distance, from a hard half-day on the 24-miler to a day-and-a-half on the 100, all of it at altitude with weather that can swing on you. That makes carbohydrate, sodium, and fluid just as decisive as fitness.

Carbs: steady, trained, and dialed for the long stuff

Aim for roughly 60 to 90 grams of carbohydrate per hour, and only push the top end if your gut is trained for it. The longer the race, the more this matters, because on a 50 or a 100 the difference between a steady stomach and a wrecked one is usually how disciplined you were with fueling in the first half. Altitude and a hard climb both blunt your appetite, so keep intake regular and easy to get down instead of waiting until you feel low. Rehearse your exact race-day carb rate on big long runs so high intake feels normal, not like a gamble at mile 70.

Sodium and fluid: plan for swings and remote gaps

Sodium needs climb with heat and sweat, so on a hot Scout Mountain year lean toward the high end, often around 500 to 700 milligrams per liter of fluid, and more if you are a heavy or salty sweater. The catch is the weather here does not pick a lane, so you may need more salt and water on a baking afternoon and far less on a cold, wet stretch up high. Carry enough fluid to cover the remote gaps between aid rather than rationing to the next one, and weigh yourself before and after a long run to find your real sweat rate so you build the plan around your own number, not a generic one.

⏵ Build your fueling plan

Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and the Scout Mountain distance you are running 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 Scout Mountain course profile, and your projected splits. Summit Line reads your real training, builds a plan for the climbing and the altitude, and rehearses your fueling so race day is something you execute, not guess at.

Scout Mountain Ultras FAQ

How hard is Scout Mountain Ultras?

It is a genuinely hard mountain ultra, and the difficulty scales with the distance you pick. Every course summits Scout Mountain and tops out around 8,686 feet, with the 24-miler carrying about 5,600 feet of gain, the 50K around 7,400 feet, the 50-miler near 10,800 feet, and the 100-miler somewhere in the 21,000 to 24,000 foot range over roughly 102 miles. On top of the climbing you get high-desert mountain trail, real altitude for sea-level legs, and famously unpredictable early-June weather that can swing from snow and hail to blazing heat. The 100 is a Hardrock qualifier for good reason.

How much climbing is in Scout Mountain Ultras?

It depends on the distance. The 24-mile loop runs about 5,600 feet of gain, the 50K about 7,400 feet, the 50-miler roughly 10,800 feet, and the 100-miler in the neighborhood of 21,000 to 24,000 feet (the official course page lists a bit over 21,000 and the race has advertised closer to 23,800, so treat it as a big number either way). Every course tops out on the Scout Mountain summit near 8,686 feet. None of these are rolling, runnable profiles, so train the up and the down.

What is the weather like at Scout Mountain Ultras?

Wildly unpredictable, and the race tells you so. Early June in these mountains can deliver anything from snow and hail up high to blazing afternoon heat down low, and in a big snow year there can still be snowfields to cross or even glissade. The race has been near perfect some years and storm-canceled others, so you have to pack for both ends. Bring real layers and a plan for cold, wet, and hot, because you may meet all three in one race.

What are the cutoff times for Scout Mountain Ultras?

Every distance shares the same hard finish: all races must be done by 10:00 PM Saturday. Because the start times differ, that gives the 100-miler about 36 hours, the midnight 50-miler around 22 hours, the 50K roughly 16 hours, and the 24-miler about 14 hours. There are also intermittent cutoffs at aid stations along the way, so you cannot bank all your buffer for the finish. Confirm the exact intermediate cutoffs in the current race-day details before you start.

Is Scout Mountain Ultras a Hardrock qualifier?

Yes, the 100-mile race is a Hardrock 100 qualifier, which is part of why it draws serious mountain runners to Southeast Idaho. To have it count you have to finish inside the official cutoff, so a finish is the whole point, not just a start. Qualifier lists get reviewed year to year, so double-check the current Hardrock qualifier status and the race rules before you build your season around it. The shorter distances (50M, 50K, 24M) are not 100-mile qualifiers.

Which Scout Mountain distance should I pick?

Match it to your real mountain experience, not your road fitness. The 24-miler is a hard but reachable first taste of the terrain with about 5,600 feet of climbing, the 50K steps it up to roughly 7,400 feet, and the 50-miler at near 10,800 feet is a serious day that starts at midnight and runs through the dark. The 100 is a true mountain hundred with 21,000-plus feet of gain, night running, drop bags, pacers, and the lows that come with 30-plus hours on your feet. If you are newer to vert and altitude, start shorter and earn the longer one.

This guide is independent and for planning only. The course details, dates, distances, 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.