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
What Montana asks of a build
Build for distance and for wet clay, not for rock. The signature Montana drives are long graded roads: 117 miles without services on the Magruder, more than 50 on Big Sheep Creek, a byway through the Missouri Breaks with no fuel on it. Tell a builder that tank range, a full-size spare and room for water matter more here than articulation.
Then think about the food locker. Across the west and southwest of the state a closed, hard-sided vehicle with the windows up is a legal place to store food, which is worth designing around if you sleep outside the cab.
A builder plans and installs the whole system rather than one part of it: suspension matched to the finished weight, protection where the vehicle actually touches the ground, electrical power sized to what you run, and storage, water, sleeping and recovery points that work together. The good ones start with how you travel and work backward to parts.
The work that matters most is the work you cannot see. Wiring that is fused, labeled and documented. Fasteners that stay tight on washboard. A finished weight that stays inside what the vehicle is rated to carry.
Most full builds cover
01Suspension and tires chosen for the loaded weight
02Bumpers, sliders, skid plates and rated recovery points
03House battery, charging, solar and lighting
04Storage, drawers, fridge and water
05Sleeping: a roof tent, a camper or an interior platform
06Mounts for communications and navigation
How to choose a builder
Any shop can show you a finished truck in good light. These questions tell you how it was built.
01Ask to see finished builds on your platform, and talk to an owner who has put miles on one if you can.
02Ask what the vehicle will weigh when it is done and how that compares to its gross vehicle weight rating. A builder who cannot answer has not done the math.
03Ask who does the electrical work and whether you get a wiring diagram at handover.
04Ask what is done in house and what is sent out.
05Get the scope, the parts list, the price and the payment schedule in writing before work starts, and ask how changes are handled.
06Ask what warranty covers their labor, separate from the manufacturers' warranties on parts.
What to have ready before you ask for a quote
A builder can only quote what you can describe. The form on this page asks for exactly these things, which is why a quote that comes back from it is worth something.
01Year, model, engine and drivetrain, and for vans the wheelbase and roof height
02What has already been done to it
03How you travel: weekends or months, how many people, which climates, how far from pavement
04What you need to carry: water, fuel, bikes, boats, tools
05A budget range and a date you would like it back
Questions people ask
How much does an overland build cost?
It depends on scope more than on the vehicle. Suspension, tires and a roof tent is a different project from a full electrical system with cabinetry and armor, and labor is usually the largest part of a full build. The only number worth planning around is a written quote against a defined scope, which is what the form on this page is for.
How long does a build take?
Bolt-on work can be days. Full builds take longer, and at busy shops the wait for a start date can be longer than the work itself. Ask every shop for both numbers: when they can start and how long they need the vehicle.
Should I build in stages or all at once?
Stages work if the order is right. Decide the finished load first, because springs chosen for an empty truck will be wrong for a full one. Run electrical before interiors go in, because pulling cabinets to add a wire is paying for the same work twice.
Will modifications affect my warranty or insurance?
They can. Ask the builder which work they have seen raise warranty questions on your platform, read your warranty terms, and tell your insurer what has been added so the build is covered for its real value.
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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