273 Forest Service, 15 BLM and 15 National Park Service. 231 take reservations
The coldest reading on record in the contiguous United States 7
-70°F
Rogers Pass, 40 miles northwest of Helena, January 20, 1954
The vehicle length limit on Going-to-the-Sun Road 25
21 ft
Between Avalanche Creek and Rising Sun, with a width limit of 8 feet including mirrors
Building a van for Montana
A van is a good fit for Montana’s long gravel, with one hard limit: Going-to-the-Sun Road bans anything longer than 21 feet or wider than 8 feet including mirrors on its middle section, and warns that over 10 feet of height meets rock overhangs west of Logan Pass. Measure before you plan that drive.
Elsewhere the questions are cold and mud. Nights are long and hard here, so ask about insulation, water lines and battery behaviour in real cold. A closed hard-sided van also satisfies the grizzly food storage orders, which a tent does not.
A conversion is a small house on a moving, flexing, weight-limited platform. The builder insulates and lines the shell, installs the electrical system, plumbing, heat and ventilation, builds the bed, galley and storage, and cuts the holes for windows, fans and vents that you do not want to get wrong.
Some shops build complete vans to a set floor plan. Others build to order, and a few will take on partial work such as electrical only.
A typical conversion includes
01Insulation, wall and ceiling panels, and flooring
02House battery, alternator charging, solar, inverter and shore power
03Roof fan, heater, and sometimes air conditioning
04Fresh and gray water, a sink, and sometimes a shower and water heater
05Bed, galley, seating and storage
06Windows, racks, ladders, awnings and exterior lighting
How to choose a van builder
Floor plans are easy to fall for. The questions underneath them matter more.
01Decide between a shop's standard layout and a custom build. Standard layouts are faster, and the shop has already solved their problems.
02Ask what the finished van weighs with water and gear. Sprinters are sold in several gross weight ratings, and a heavy build on the lightest chassis leaves little margin.
03Ask how the electrical system is protected and documented, and whether the components can be serviced on the road.
04Ask how cabinetry is fastened to the van. Furniture that is only screwed to thin wall panels works loose on rough roads.
05Ask how added seats and seat belts are engineered and anchored if anyone rides behind the front row.
06Get the scope, price, payment schedule and delivery date in writing.
What to have ready before you ask for a quote
The van you order decides what can be built in it, so it helps to talk to a builder before you buy.
01Model year, 144 or 170 wheelbase, roof height, and two-wheel, all-wheel or four-wheel drive
02How many people sleep in it and how many ride in it
03The seasons and climates you travel in
04Whether you need to work from it
05What goes inside with you: bikes, boards, dogs
06A budget range and the date you want to be traveling
Questions people ask
Do I need to own the van before I contact a builder?
No. Many builders would rather talk first, because the wheelbase, roof height and drivetrain you order decide what can be built. Some shops can also source a van.
How long does a Sprinter conversion take?
A full custom build is usually measured in months, plus whatever wait the shop has before it can start. Standard layouts are quicker. Ask for both numbers.
Should I get the 144 or the 170 wheelbase?
The 144 is easier to park, turn and drive on tight roads. The 170 gives you room for a fixed bed and a real galley without compromise. Think about where you will actually drive it, then about how you want to live in it.
Can these builders work on a Ford Transit or Ram ProMaster?
Many do. If you are on another platform, say so in the form and we will look for shops with that experience.
How high is Montana?
From Libby at 2,097 feet to Granite Peak at 12,799.
Altitude decides what your engine, your brakes and your lungs have to work with, and how late in the year the passes open.
2,0004,0006,0008,00010,00012,00014,000
Feet above sea level
Towns
Red LodgeWhere the Beartooth Highway starts its climb on US 212, heading for Beartooth Pass and Cooke City.5,568 ft
ButteOn I-90 with the BLM’s Western Montana District office. The Pipestone off-highway vehicle area is about 15 miles east at exit 241.5,535 ft
PhilipsburgIn Granite County, on the far side of Skalkaho Pass from the Bitterroot Valley. Montana 38 over the pass closes for the winter.5,243 ft
DillonHome of the BLM field office that manages more than 900,000 acres in Beaverhead and Madison counties, and the Big Sheep Creek byway to the south.5,097 ft
EnnisOn Montana 287. The Forest Service routes Gravelly Range traffic from here by the Varney road and the Call road, and keeps the area’s maps at its office in town.4,946 ft
BozemanOn I-90. The Custer Gallatin’s Bozeman Ranger District is one of the five west-side districts under the forest’s food storage order.4,811 ft
HelenaState capital, and half the name of the 2.8-million-acre Helena-Lewis and Clark National Forest. Rogers Pass, 40 miles northwest, holds the national cold record.4,048 ft
LewistownBLM field office for the Upper Missouri River Breaks and seat of the North Central Montana District. One of the two offices the BLM names for byway conditions.3,952 ft
DarbyThe Montana end of the Magruder Road Corridor. The Forest Service counts eight to ten hours from Red River, Idaho, to Darby without rest stops.3,884 ft
HamiltonIn the Bitterroot Valley on US 93, near the west end of Montana 38 and in the middle of the 1.6-million-acre Bitterroot National Forest.3,570 ft
WinifredOne end of the Missouri Breaks byway, which the BLM runs between here and the James Kipp Recreation Area on US 191.3,228 ft
MissoulaOn I-90 beside the 2.3-million-acre Lolo National Forest. The BLM field office here manages the Garnet Back Country Byway, which leaves Montana 200 about 30 miles east.3,208 ft
BillingsOn I-90 in south-central Montana. The BLM’s Montana/Dakotas State Office is here.3,122 ft
KalispellIn the Flathead Valley below the 2.4-million-acre Flathead National Forest, west of Glacier National Park.2,955 ft
Fort BentonWhere the Breaks begin on US 87. The Missouri Breaks Interpretive Center here holds maps and road conditions for the monument.2,635 ft
LibbyOn the Kootenai River. The 67-mile Lake Koocanusa Scenic Byway runs north from here to Eureka on Highway 37.2,097 ft
Passes, high roads and summits
Granite PeakThe highest point in Montana, in Park County. No road to the top12,799 ft
Beartooth PassBeartooth Highway (US 212): Red Lodge to Cooke City, by way of the northwest corner of Wyoming10,947 ft
Mount ClevelandThe highest peak in Glacier National Park, by the park’s own figure10,448 ft
Crystal ParkPioneer Mountains Scenic Byway: Montana Highway 484 at Wise River south to County Highway 2787,800 ft
Skalkaho PassSkalkaho Highway (Montana 38): Ravalli and Granite counties, across Skalkaho Pass7,261 ft
Logan PassGoing-to-the-Sun Road: The west entrance of Glacier National Park to the east entrance, over Logan Pass6,646 ft
Nez Perce PassMagruder Road Corridor: Darby, Montana, to Red River, Idaho, between the Selway-Bitterroot and Frank Church wildernesses6,598 ft
Pass, road and summit elevations are the figures published by the agency that manages them. Town elevations are the town’s or county’s own
figure where it publishes an exact one; the rest are from the U.S. Geological Survey (3D Elevation Program at the place’s official coordinates),
retrieved September 18, 2026. Every source is listed at the foot of the page.
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