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⏵ Course guide · Montana ultra

Le Grizz 50 Mile Ultramarathon Course Guide

Le Grizz is one of the oldest 50 milers in the world, run every October since 1982 on the gravel North Fork Road along the Flathead River, just west of Glacier National Park. It is flat-ish, fast, and famously friendly, which makes it a great first 50, but the distance and the cold are real. I will walk you through the course first, then give you a pacing and fueling plan that fits a long, gentle-grade gravel race in northwest Montana. There are free calculators along the way to dial in your own numbers.

⏵ At a glance

Le Grizz 50 Mile quick facts

Date
Saturday, October 10, 2026 (traditionally the second Saturday of October)
Location
North Fork Road along the Flathead River near Polebridge, MT, west of Glacier National Park
Distances
50 mile (solo), 50 mile relay, 15K, and 5K
Elevation gain
About 2,300 ft over the full 50 miles, on undulating gravel road
Start
7:00 AM shotgun-blast start (6:00 AM early start on request at packet pickup)
Cutoff
About 15 hours (course closes around 10:00 PM); runners slower than a 12-hour pace must bring their own crew
Qualifier
No Western States, Hardrock, or UTMB qualifier status listed by the race

These facts come from the official race site and RunSignup. Check the current date, cutoffs, crew rules, and aid stations in the race-day details before you commit. Race logistics change year to year.

The course: where Le Grizz is won and lost

Le Grizz is an out-and-back on the North Fork Road. You start at the Big Creek Outdoor Education Center, head roughly 25 miles north up the gravel toward the turnaround past Whale Creek and the North Fork Community Hall, then run the same road back south to the finish. It is about 50 miles with only around 2,300 feet of total climbing, all on smooth, undulating gravel that parallels the river. No technical footing, no big mountain. The race is really about the distance, the grade, and the cold.

The road north: bank patience, not minutes

The gravel rolls gently the whole way up, and that is exactly the trap. Because nothing is steep, the early miles feel easy and it is tempting to bank time. Do not. The runners who blow up at Le Grizz are almost always the ones who ran the first 25 too hard because the grade let them. Settle into a relaxed effort you could hold all day, hike the few short risers if you want to, and let the gentle downhill stretches do the work for free.

You roll through a handful of aid stations on the way out, with names like Demers Ridge, Home Ranch Bottoms, the Polebridge Mercantile, and Red Meadow before the turnaround. Home Ranch Bottoms is your drop-bag stop (around miles 11 and 39), so that is where to stage spare layers, fuel, and anything you want both directions. Know roughly where the aid sits so you carry enough between stops.

The turnaround and the road home

The turnaround sits about 25 miles out, just past Whale Creek near the North Fork Community Hall, and then you retrace the whole thing south. Here is the honest part: an out-and-back means the gentle climbs you got on the way out come back as gentle climbs on the way home, now in tired legs. None of it is hard on its own, but at mile 40 a grade that felt like nothing at mile 10 can feel like a wall.

This is where the race is actually won. If you paced the road north with discipline, the back half is a steady, grind-it-out cruise where you reel people in. If you spent your matches early, those last 10 to 15 miles turn into a long, cold shuffle. Keep eating, keep your effort honest, and treat every aid station on the way back as a checkpoint, not a couch.

Cold, dark starts and the October weather

This is the second Saturday of October in northwest Montana, and the start goes off at 7:00 AM with a shotgun blast while it is still dark and often frosty. Expect a cold morning, big temperature swings as the sun comes up over the valley, and gold aspen and larch along the river if the timing is right. The cold is sneaky in a long race: it suppresses your thirst, so you drink less without noticing and quietly dig a hydration hole.

Dress in layers you can shed and stash in your Home Ranch Bottoms drop bag, carry a little more than you think you need at the cold start, and do not let the chill talk you out of eating and drinking on schedule. Managing the cold and your own discipline, not fighting any terrain, is the whole game here.

Pacing strategy for a flat, fast 50 miler

With only about 2,300 feet of gentle climbing on gravel road, Le Grizz is one of the few ultras where a pace chart genuinely helps. But the gentle grade is also what gets people, so the plan is to run the first half slower than feels right and let the second half come to you.

Respect the gentle grade, do not chase the easy miles

On a road this runnable it is tempting to just lock onto a pace and hammer, but a flat 50 miler punishes early greed just as hard as a mountain one does, it just hides the punishment until the back half. Use a grade-adjusted pace to see what those gentle ups and downs actually cost you, so you hold an even effort instead of an even pace and do not accidentally surge on every little rise. Even on smooth gravel, effort is the thing to manage, not the number on your watch.

Build a finish prediction and a back-half plan

Because Le Grizz is fast and forgiving, it is one of the rare ultras where a realistic finish prediction is close to honest, which makes it perfect for setting a goal and a negative-split plan. Build a vert-aware finish window off your fitness, then work backward into the aid stations so you know what time you want to hit the turnaround and each stop on the way home. That keeps you from torching the road north and gives you a clean target for reeling people in over the last 25.

⏵ Free tools to pace this course

Fueling strategy for a long, cold day

Most runners are out on the Le Grizz course for roughly 8 to 13 hours, and the cold air quietly hides how much you are losing. That makes a steady, scheduled intake of carbohydrate, sodium, and fluid just as important as fitness, maybe more.

Carbs: steady, trained, and on the clock

For a day this long, aim for around 60 to 90 grams of carbohydrate per hour, and only push the high end if your gut is trained for it. The smooth gravel actually helps here, it is easy to eat on the move without worrying about your feet, so use that. The risk at Le Grizz is forgetting to eat because you feel fine in the cold early on, then bonking on the road home. Set a timer or eat at every aid station, practice your exact race-day carb rate on long runs, and keep it boringly consistent.

Sodium and fluid: the cold-weather trap

Cold weather is sneaky because you stop feeling thirsty even though you are still sweating under your layers, so do not hydrate by feel. Drink on a schedule and take sodium with it, usually somewhere in the range of 300 to 700 milligrams per liter of fluid, more if you run warm or salty. Carry enough to cover the gaps between aid stations comfortably, and weigh yourself before and after a long run to learn your real sweat rate so you build the plan around your own number, not a guess.

⏵ Build your fueling plan

Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and a long cold day on the North Fork Road 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 Le Grizz course profile, and your projected splits. Summit Line reads your real training, builds a plan for a fast 50 miler on gravel, and rehearses your fueling so race day is something you execute, not guess at.

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Le Grizz 50 Mile FAQ

How hard is the Le Grizz 50 Mile Ultramarathon?

Le Grizz is one of the more approachable 50 milers out there, but 50 miles is still 50 miles. The course runs on undulating gravel road along the North Fork of the Flathead with only about 2,300 feet of total climbing, so the footing is friendly and there is no big mountain to crack you. What makes it hard is the distance, the cold October air, and the temptation to run the gentle grade too fast early. The roughly 15-hour cutoff (course closes around 10:00 PM) gives most trained runners plenty of room, so this is a real candidate for a first 50.

How much climbing is in Le Grizz?

Not much by ultra standards. The full 50 miles has only about 2,300 feet of total elevation gain, spread out as rolling, gentle grade on gravel road rather than any single big climb. Because it is an out-and-back, the bumps you run going north you also run coming back south. That makes Le Grizz one of the flatter, faster 50 milers on the calendar, which is exactly why it works as a first one.

How should I fuel for Le Grizz?

Plan for a long day on your feet, somewhere in the 8 to 13 hour range for most runners, in cold air that quietly hides how much you are sweating. Most people do well on roughly 60 to 90 grams of carbohydrate per hour, leaning higher if your gut is trained for it. The cold is the trap: you will not feel thirsty, so set a schedule and keep drinking and eating on the clock instead of by feel. Run your own numbers for your weight and goal time with the free ultra fueling calculator.

What are the cutoff times for Le Grizz?

The 50 mile course closes around 10:00 PM, which is roughly a 15-hour limit off the 7:00 AM start, and a 6:00 AM early start is available on request at packet pickup if you want extra time. There is also a safety rule: any runner moving slower than a 12-hour pace must have their own crew along to monitor them, or staff can pull them. Confirm the exact current cutoffs and crew rules in the race-day details before you commit.

What is the terrain and weather like at Le Grizz?

The whole race is on the North Fork Road, an undulating gravel road that parallels the North Fork of the Flathead River west of Glacier National Park. The footing is smooth and beginner-friendly, no technical single-track. The catch is the weather: this is the second Saturday of October in northwest Montana, so you can get a frosty start, swings from cold to mild and back, and aspen and larch turning gold along the river. Pack layers and plan for cold, especially at the dark early start.

Is Le Grizz a good first 50 miler?

Yes, it is one of the better choices for a first 50 mile race. The gravel-road surface, the modest 2,300 feet of climbing, and the generous roughly 15-hour cutoff take a lot of the usual mountain-ultra danger off the table, so you can focus on the distance itself. It is also one of the oldest 50 milers in the world, dating to 1982, with a friendly, no-frills atmosphere and a famous shotgun-blast start. Train your long runs and your fueling, respect the cold, and most committed runners can get to that finish.

This guide is independent and for planning only. The course details, dates, cutoffs, crew rules, 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.