Highway 191 doesn't have much competition. From Bozeman it follows the Gallatin River into the canyon, goes right past the turn for Big Sky, and keeps heading south toward West Yellowstone and the park's west entrance. In summer it's anglers, rafters and campers. In winter it's skiers and sled trailers. Either way, plenty of people on that road own something that has to be parked for half the year.
Leave early, by the way. Bighorn sheep like to stand on the canyon road and lick the salt off it, and they are in no hurry whatsoever. The same questions come up every season. Where do the sleds go in summer? Where does the boat go in winter? And what do you do with a fifth wheel that's too long for the driveway and not exactly welcome in the neighborhood?
Winter sets the calendar down near West Yellowstone. From early November to late April the park closes most of its roads to regular vehicles. What's left is oversnow travel, meaning guided snowmobiles and snowcoaches, and that window runs from mid-December into mid-March. The plan for 2026-27 has the west, south and east entrances opening to that traffic on December 15 and staying open into mid-March, if the weather plays along. There's plenty to ride once you're there, too, since West Yellowstone has something like 150 miles of groomed trail. So the sleds come out in December, and in April they need a home.
Summer flips everything. Boats come out for the rivers and lakes, RVs head for campgrounds, and the snowmobile trailer has to go somewhere other than the front yard. Plenty of subdivisions and homeowner associations limit how long a trailer or RV can sit in view, and plenty of garages were built for cars, not for a 30-foot rig. That's no knock on the neighbors. It's just what happens when a valley fills up with gear that only gets used a few months at a time.
RVs get hurt through the plumbing. One industry guide puts the freezing threshold for RV water lines at 30°F held for more than half an hour, a line the canyon crosses well before winter officially starts. So the water system comes first. Drain the fresh tank and the low-point lines, empty the water heater and bypass it so it doesn't swallow a few gallons of antifreeze, then push the non-toxic RV kind (never the automotive stuff) through the lines and splash a little down each drain. If it's a motorhome, fill the tank and add stabilizer. Inside, empty the fridge and leave its doors propped open. Clear out every scrap of food and anything with a smell, because a mouse can find a granola bar in a closed cabinet. Shut the vents but leave some airflow if the unit lets you, and take anything valuable home with you.
With boats it's all about water, specifically getting every drop of it out. Engine, lines, livewells, bilge, all of it. Your engine manual has the exact winterizing steps, so follow those, then add fuel stabilizer and pull the batteries. Montana is serious about aquatic invasive species, too, so clean, drain and dry the boat before it goes in. You'll be glad you did when spring comes around.
Sleds that sit all summer need a few things. Fresh fuel with stabilizer in it. A battery that's either on a maintainer or tucked away inside somewhere warm. A cover that lets the machine breathe. Plenty of owners also fog the engine and take the weight off the track and skis, though the manual will say what it prefers. The mistake that costs the most is leaving old fuel in the tank, where it turns to varnish and clogs the fuel system by fall.
And don't forget the trailer under all of it. Before it goes in, look the tires over, because tires that sit under load for months can flat-spot or crack, and give the bearings a look while you're down there. Then chock it, lock the hitch, and plug in to test the lights while you can still reach the connection without climbing over everything. Small job. It pays off the first time you hook up in spring and everything just works.
Heated storage cuts down on freeze risk and takes the daily swings out of the picture, which is where condensation comes from. It won't winterize anything for you. It's a second layer: a properly winterized RV in heated storage is covered twice, and an unwinterized one is covered once and hoping for the best.
Big Sky Storage is now open at 204 Blacksmith Loop in the Gallatin Canyon, minutes from Big Sky. It has heated drive-up bays up to 12x45, and every unit on the property is heated or climate-controlled. The details on RV, boat and trailer storage are at bigskystorage.com. The gate is open to tenants around the clock, which helps when a trailer has to move on short notice.
Length is where people get caught. A trailer's listed length often describes the box, and the tongue and hitch can add several feet on top, so the number on the spec sheet and the number a bay has to hold aren't always the same. Measure from the tip of the tongue to the rear bumper, add any bike rack or rear carrier, then measure height and width at the widest and tallest points. Bring those numbers when you call, and ask about door dimensions. A 12x45 bay is the upper limit. Most rigs fit comfortably, but a long fifth wheel is worth confirming before anyone plans around it.
Most people who haul to the park rotate gear twice a year. In early fall the RV or boat goes in and the sleds come out. In spring it flips. Put the dates on the calendar like a dentist appointment. Weather in this corridor doesn't care about your calendar, and a trailer that has to move the same weekend a storm lands is nobody's idea of fun. Keep the registration, insurance papers and spare keys in one place, and photograph the odometer, the fuel level and any existing dings before you park.
Everybody talks about what's at the end of 191. Fewer people talk about the trailer in the driveway that got them there. It's worth a plan, and an afternoon of prep in October beats a split waterline in March.
