Missoula set a new daily snowfall record with 8.6 inches on Monday, breaking a mark that had stood since 1917.
But that was overshadowed by snow totals in Bitterroot Valley, with 26 inches in Stevensville and 25 inches in Hamilton.
The snow and extreme cold shut down Ravalli County offices except for emergency and essential personnel and it threatened livestock amid calving season.
The area got a break from the snow on Tuesday, but more is in the forecast this week.
The Gallatin National Forest Avalanche Center issued backcountry avalanche warnings for mountain ranges across southwestern Montana and into Idaho.