Winter Storm Warning in Big Belt, Bridger and Castle Mountains

Winter Storm Warning issued December 5 at 5:18PM MST until December 6 at 2:00PM MST by NWS Great Falls MT

• Event Start: 2025-12-05T17:18:00-07:00
• Event End: 2025-12-06T14:00:00-07:00
• Event Certainty: Likely
• Event Severity: Severe

Event Description

• WHAT: Heavy snow. Additional snow accumulations between 4 and 11 inches. Isolated higher amounts. Winds gusting as high as 45 mph.
• WHERE: Big Belt, Bridger and Castle Mountains, Little Belt and Highwood Mountains, and Gallatin and Madison County Mountains and Centennial Mountains.
• WHEN: Until 2 PM MST Saturday.
• IMPACTS: Tire chains may be required for some vehicles if traveling through mountain passes. Blowing snow could significantly reduce visibility. Gusty winds could bring down tree branches.
• ADDITIONAL DETAILS: Significant travel impacts to the Friday evening commute are possible for Bozeman Pass and along Highway 191 south of Bozeman.

Event Instructions

If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions can be obtained by calling 5 1 1 or visiting the MDT Road Report website.