Montana is bigger than people from outside it tend to remember. Driving an EV across this state is an exercise in respecting that scale. The infrastructure is improving. The distances are not getting any shorter.

I-90: 552 Miles, and NEVI Is Filling It In

Montana’s I-90 segment is the longest of any state covered in this directory — 552 miles from Lookout Pass at the Idaho line to Wyola at the Wyoming border. Missoula, Butte, Bozeman, and Billings string along it with real charging density, 28 stations across the corridor. The gaps are between those cities, not within them. Four NEVI awards are closing them: Missoula has a Tesla site under construction (Q3 2026), Three Forks an EV Gateway award permitted for Q4 2026, Big Timber an EVgo award funded for Q2 2027, and Hardin a NorthWestern Energy site funded for Q3 2027. Until those come online, the Missoula-to-Billings run requires planning around the existing stations rather than assuming density that isn’t there yet.

US-89: Glacier to Yellowstone, the Corridor Most People Actually Drive

The Glacier-to-Yellowstone run via US-89 is the trip most visitors actually plan around, more than I-90. It runs 412 miles from Carway at the Canadian border through Browning, Great Falls, and Helena to Livingston, with 16 stations along the way. Great Falls has a Tesla NEVI site permitted for Q1 2027 on I-15, which also serves this corridor’s western leg. The elevation changes are real and the towns are spread out, but this is the most charge-able way to connect Montana’s two marquee national parks.

US-2 and the Hi-Line: The Hardest Corridor in the Region

US-2, the Hi-Line, is the single hardest EV corridor anywhere in this seven-state directory. It runs 668 miles from Troy to Bainville along the Canadian border, with 14 stations spread across the entire route. East of Havre, the gaps stretch well past comfortable range for most EVs, even with a full charge. This is not a corridor to drive on optimism. If you’re routing across northern Montana, treat every charger as mandatory and build real margin into the plan — there is no margin built into the road itself.

The Grid: Coal-Heavy, and the Hardest Carbon Math in the Region

Montana’s grid mix is the toughest sustainability story in this directory. Coal still supplies a substantial share of the state’s electricity, particularly in the east, and the transition is slower here than in Colorado or Washington. NorthWestern Energy, the dominant utility, plays a double role worth naming directly — it’s both the grid operator most EVs in Montana are charging from and, at Hardin and Glendive, a NEVI station operator in its own right. A station’s sustainability score in Montana will, on average, run lower than the same network’s score in a state with a cleaner grid. That’s not a flaw in the scoring. It’s an accurate read of where Montana’s electricity actually comes from in 2026.

Glacier and Yellowstone: What Works, What Doesn’t

Glacier’s West Glacier KOA has 50-amp RV hookups and an explicit EV-charging-allowed policy — the most reliable charging option at either park’s gateway. Inside Glacier and inside Yellowstone, there is no charging infrastructure. Arrive at both parks with a full battery and treat in-park driving as range you’ve already budgeted for, not range you’ll recover along the way.

The Bottom Line

Montana asks more of trip planning than any other state in this region except Wyoming. The distances are genuinely large, US-2 is genuinely sparse, and the grid is genuinely coal-heavy. None of that makes Montana un-driveable by EV. I-90 works with planning, US-89 connects the two big parks, and NEVI is closing real gaps on a multi-year timeline. Respect the scale, charge fully before US-2, and the state opens up.

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