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HURL Elkhorn Endurance Runs Course Guide

The HURL Elkhorn Endurance Runs are a set of remote, rugged mountain races deep in the Elkhorn Mountains near Helena, Montana, run on the first Saturday in August by the Helena Ultra Runners League. You get a 50 Mile, a 50K, and a 13.1 Mile across very technical singletrack and primitive jeep road, with real altitude, big climbs, and cold creek crossings. It is Montana’s oldest trail ultra and it earns its reputation. I will walk you through the course first, then give you a pacing and fueling plan that fits the vert and the remoteness, with free calculators along the way to dial in your own numbers.

⏵ At a glance

HURL Elkhorn quick facts

Date
Saturday, August 1, 2026 (first Saturday in August)
Location
Elkhorn Mountains, near Helena, Montana
Distances
50 Mile, 50K, and 13.1 Mile
Elevation gain
50M: about 13,400 ft · 50K: about 7,900 ft · 13.1M: about 3,300 ft
High point
50M just under 9,000 ft · 50K about 8,000 ft
Starts
50M: 5:00 AM · 50K: 7:00 AM · 13.1M: 8:00 AM
Cutoff
10:00 PM finish-line cutoff for all events (50M ≈ 15 hr), with intermediate 50M cutoffs
Qualifier
No Western States, Hardrock, or UTMB qualifier status listed by the race

These facts come from the official race site and UltraRunning. The race started back in 1989 as a 100K out of Clancy and the current HURL format is the 50 Mile, 50K, and 13.1 Mile. 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 HURL Elkhorn is won and lost

All three distances run on the same rugged Elkhorn Mountains trail system, and the character is the same: technical singletrack, stretches of primitive jeep road, no pavement, and creek crossings, all stacked with climbing. The 50 Mile is the centerpiece at about 13,400 feet of gain to a high point just under 9,000 feet. The 50K shares the same terrain at about 7,900 feet. This is high, remote country, so the climbs, the footing, and the gaps between aid are the whole game.

The climbs: long, sustained, and at altitude

The Elkhorns do not give you flat. The 50 Mile stacks roughly 13,400 feet of gain across the day, and a lot of it comes in long, sustained climbs up toward the 8,000 to 9,000 foot tops. This is where the race gets won or lost, and the move is patience. Hike the steep pitches efficiently, keep your effort even, and let the altitude set your ceiling instead of fighting it. Push the early climbs because they feel fine at 6:00 AM and you will pay for it deep in the back half.

You are up near 9,000 feet on the high 50 Mile sections, and that altitude makes every grade feel harder than the number says, especially if you live low. Breathe, settle in, and treat the climbs as the part you manage carefully rather than the part you attack.

The descents and the technical footing

What goes up in the Elkhorns comes down on rough trail. The descents are technical, rocky singletrack, and they beat up your quads fast if you bomb them early. The back half of the 50 Mile is where badly paced people fall apart: cooked legs plus rocky downhill late in the day turns into a slow, careful shuffle. Practice controlled, runnable descending on technical ground before race day so you can keep your feet moving when it counts.

Quick feet and attention matter as much as fitness here. A rolled ankle or a hard fall on a remote section is a long way from help, so on the gnarly stuff, run smart, not reckless.

Remoteness, creek crossings, and the gaps between aid

This is genuinely remote backcountry, and the aid stations are spread out. The 50 Mile runs through roughly eight aid stations across the day (Elk Park, Tizer Lake, Elkhorn Town, Skyline Mine, Guard Station, and on through Tepee Creek and McClellan Creek), while the 50K hits about five with a longest gap near 8 miles. Carry enough fluid and calories to get yourself across those gaps. Do not assume the next aid is close, because out here it usually is not.

The creek crossings are part of the deal and honestly part of the fun, cold and clear, good for dunking a hat and cooling your core on a warm afternoon. Just plan for wet feet and manage your socks and shoes so you are not fighting blisters by the late miles.

Pacing strategy for a high-vert mountain ultra

With this much climbing at altitude on technical trail, HURL Elkhorn is about managing effort, not chasing a pace chart. Run the climbs by feel, save your legs for the rocky descents, and keep margin against the cutoffs.

Pace the climbs by grade, not by the watch

Your flat-ground pace means nothing on the long Elkhorn climbs. What matters is grade-adjusted effort, so hold a steady output you can sustain up the grade and hike the steep pitches without feeling bad about it. The classic mistake here is running the early climbs too hard because they feel easy, then blowing up on the technical descents and 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 first half.

Build a vert-aware finish prediction

Do not guess your Elkhorn finish off a road time. The 13,400 feet of climbing on the 50 Mile (or the 7,900 on the 50K), the technical footing, and the altitude all add real time. A vert-aware finish prediction that accounts for this course’s climbing gives you a realistic window and lets you work backward into the 10:00 PM cutoff and the intermediate 50 Mile cutoffs, so you actually know how much buffer you have at each checkpoint instead of guessing.

⏵ Free tools to pace this course

Fueling strategy for a long day in the mountains

The 50 Mile can run 9 to 15 hours at altitude, with long gaps between aid. That makes carbohydrate, sodium, and fluid just as important as fitness. The shorter distances need a steady plan too.

Carbs: steady and trained

For a long mountain day, aim for around 60 to 90 grams of carbohydrate per hour, and only push the higher end if your gut is trained for it. Altitude and effort can dull your appetite and slow your stomach down, so keep your intake steady and easy to get down instead of gambling on big late doses when you are already behind. Practice your exact race-day carb rate on long climbing runs so 80-plus grams an hour feels normal, not like an experiment.

Sodium and fluid: plan for the gaps

Lean toward the high end on sodium if the day is warm or you are a salty sweater, often around 500 to 700 milligrams per liter of fluid. Just as important, carry enough fluid to get across the long, remote stretches between aid stations (up to about 8 miles between aid on the 50K) instead of rationing to the next one and arriving empty. The cold creek crossings help you cool down on a warm afternoon, but they do not replace a real hydration plan. Weigh yourself before and after a long run to find your true 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 a long Elkhorn day 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 HURL Elkhorn 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.

Start free →Explore the demo

HURL Elkhorn Endurance Runs FAQ

How hard is the HURL Elkhorn Endurance Runs?

It is genuinely hard, and the remoteness is a big part of why. The 50 Mile racks up around 13,400 feet of climbing on about 37 miles of very technical singletrack plus jeep road, topping out just under 9,000 feet, and it asks for a 10:00 PM finish off a 5:00 AM start. The 50K is no warm-up either at roughly 7,900 feet of gain. You are deep in the Elkhorn Mountains with long gaps between aid, real altitude, and footing that punishes anyone who is not used to rocky mountain trail. Steady climbing, careful descending, and a fueling plan you have rehearsed matter way more than flat speed here.

How much climbing is in the HURL Elkhorn 50 Mile and 50K?

The 50 Mile has about 13,400 feet of total elevation gain with a high point just under 9,000 feet, per the official course description, and the surface is roughly 37 miles of very technical singletrack, 13 miles of primitive jeep road, and a mile of maintained dirt road. The 50K carries about 7,900 feet of gain and tops out around 8,000 feet. The 13.1 Mile is the short option at about 3,300 feet of gain with a high point near 7,200 feet. None of these are gentle, this is rugged high country with sustained climbs and technical drops.

How should I fuel for the HURL Elkhorn Endurance Runs?

Treat the 50 Mile as a long, high-altitude day, often 9 to 15 hours, with long stretches between aid stations. Most runners do well on roughly 60 to 90 grams of carbohydrate per hour, leaning higher if your gut is trained for it, plus sodium that climbs with your sweat rate (often 500 to 700 mg per liter of fluid, more if you run salty). The 50K and 13.1 Mile are shorter but still demand steady fueling on the climbs. The longest gap between aid on the 50K is about 8 miles, so carry enough to cover it instead of rationing to the next station. Run your own numbers with the free ultra fueling calculator.

What are the cutoff times for the HURL Elkhorn Endurance Runs?

All distances share a 10:00 PM finish-line cutoff. For the 50 Mile that works out to about 15 hours off the 5:00 AM start, and there are intermediate cutoffs along the way (for example around late morning at Elkhorn Town near mile 20, then through the afternoon and evening at the later aid stations), so you cannot save all your buffer for the end. The 50K and 13.1 Mile also have to be in by 10:00 PM, which is generous for those distances. Confirm the exact current intermediate cutoffs in the race-day details before you start.

What is the terrain and weather like at HURL Elkhorn?

The course is remote, rugged Elkhorn Mountains terrain: very technical singletrack, primitive jeep and double-track road, no pavement, and cold, clear creek crossings to splash through. Expect rocks, roots, forest, open meadows, and exposed high-country sections near the 8,000 to 9,000 foot tops. Early August in Montana can swing from cold at the dark 5:00 AM start up high to warm and exposed by midday, with afternoon mountain thunderstorms always a possibility. Pack for a range and respect the altitude and the exposure.

Is the HURL Elkhorn a good first 50 Mile or 50K?

It can be a strong goal race for a well-prepared runner, but it is not an easy place to start. The vert, the technical footing, the altitude, and the remoteness all ask for specific prep: time on rocky singletrack, real practice climbing and descending long grades, and a fueling and hydration plan you have actually rehearsed. As Montana’s oldest trail ultra it is a classic, low-key, and well-loved event, but the mountains are real. If you train the climbs and the descents and respect the cutoffs, most committed runners can finish.

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.