Up to 20 inches of snow and 60 mph gusts are making travel treacherous across the state
Spring has not come quietly to Montana. A powerful late-April storm planted itself over the Northern Rockies and refused to leave, turning highways into obstacle courses and pushing snow totals closer to February levels than anything the calendar should allow.
By Friday morning, some areas were staring at nearly 20 inches of accumulation at elevation, with gusts tearing through mountain corridors at up to 60 mph. For anyone trying to drive through the state, the situation demanded either patience or a serious rethink of the route.
The 5 routes taking the worst of it
1. I-90 across western Montana is compromised through the Gallatin and Madison ranges south of Bozeman, where snow totals near 20 inches above 7,500 feet and valley floors are receiving 3 to 6 inches with 40 mph gusts. The stretch between Bozeman and Whitehall, running through Three Forks and Gallatin Gateway, falls under active advisory. Homestake Pass east of Butte and Lookout Pass at the Idaho border, one of the most treacherous sections of I-90 in the country and a critical freight corridor connecting Seattle to Minneapolis, are both part of the same alert.
2. I-15 at Monida Pass, the border crossing between Montana and Idaho, is under advisory for 1 to 4 additional inches. This pass is not a minor road. It is the main freight artery linking Salt Lake City, Helena, and the Canadian border, which means any slowdown there sends ripple effects across multiple states.
3. US-212 through Cooke City and the Beartooth Mountains carries a warning running until 6 p.m. MDT Friday. The Beartooth Pass, the highest paved road in the region, only just reopened for the season before this storm arrived. Avalanche danger is rising through the day and the Absaroka range is seeing some of the most sustained accumulation of the entire event.
4. US-14 through the Bighorn Mountains in Wyoming falls inside the same alert zone, with forecasters describing likely whiteout conditions through Burgess Junction. The language used by the National Weather Service is direct: anyone with plans on that route is advised to find an alternative.
5. The Bears Paw Mountains and Rocky Boy Reservation in northern Montana are carrying the longest-running alert of the event, extending through noon Saturday with 4 to 10 inches in the mountains and gusts up to 50 mph. Visibility there is expected to be severely reduced, not just limited.
Yellowstone caught in the middle
The timing could not be worse for Yellowstone National Park, which was in the middle of its spring road-opening sequence when the storm arrived. Pitchstone Plateau alone is expected to pick up as much as 18 inches, and the Teton and Gros Ventre ranges are looking at up to 20 inches on their highest peaks. Togwotee Pass on US-26/287 falls within the same zone. Anyone planning a visit to Grand Teton or Yellowstone this weekend is urged to check current road status at nps.gov before committing to any route, as conditions are changing through the day.
Relief is coming, but not all at once
The storm is not permanent, even if it feels that way. Most active warnings across the region are set to expire by Friday afternoon, with conditions improving steadily after that. Today brought lingering showers and mixed rain and snow at lower elevations, with temperatures stuck in the 40s and 50s and mountain areas still feeling decidedly wintry.
Wednesday will offer one more unsettled day before the pattern shifts meaningfully. Thursday is expected to break sunny with highs climbing into the 60s, and by Friday, May 1, much of the state should be enjoying mostly sunny skies with temperatures reaching the 60s and 70s. A weak system may bring scattered showers over the weekend before conditions improve again.
What drivers need to know right now
The single most practical piece of advice is to delay mountain driving until Friday afternoon if at all possible. For those who cannot wait, chains should be in the vehicle for any route approaching Big Sky, West Yellowstone, Cooke City, or the Bighorns. Calling 511 before departure is essential. Montana (511mt.net), Idaho (511.idaho.gov), and Wyoming (wyoroad.info) all maintain real-time road condition services that are more current than any regional forecast.
One factor that catches drivers off guard every time: all-wheel drive helps with forward momentum. It does nothing to help stop on ice, and every bridge and overpass in the warning zone is actively refreezing.
By Saturday, the worst of it will be a memory. Getting through Friday is the part that requires attention.