Winter Storm Warning Rocky Boy's Agency, Montana

Winter alerts in Rocky Boy's Agency, newest first, in effect or ended
Alert	State	Severity	Places
Winter Weather AdvisoryEnded Snow. Issued October 9 Ended October 12, 2026	Montana	Moderate	57 places Rocky Boy's Agency Havre Shelby Cut Bank Fort Belknap Agency Chinook Hays Chester Harlem Havre North and 47 more
Winter Weather AdvisoryEnded 3 to 6 inches of snow, with up to 10 inches across southern Chouteau County. Issued March 12 Ended March 14, 2026	Montana	Moderate	43 places Rocky Boy's Agency Shelby Cut Bank Fort Benton Rocky Boy West Hays Chester Big Sandy Valier Parker School and 33 more
Winter Storm WatchEnded Gusts up to 75 mph, 9 to 19 inches of snow possible, gusts up to 55 mph. Issued March 10 Ended March 12, 2026	Montana	Severe	118 places Rocky Boy's Agency Great Falls Lewistown Malmstrom AFB Shelby Cut Bank North Browning Conrad South Browning Choteau and 108 more
Winter Weather AdvisoryEnded 3 to 6 inches of snow, gusts up to 40 mph. Issued March 8 Ended March 9, 2026	Montana	Moderate	146 places Rocky Boy's Agency Great Falls Havre Lewistown Malmstrom AFB Shelby Cut Bank North Browning Conrad South Browning and 136 more
Winter Weather AdvisoryEnded 2 to 6 inches of snow below 7000 feet and up to 10 inches above 7000 feet with locally higher amounts possible along the peaks, gusts up to 65 mph. Issued February 26 Ended February 28, 2026	Montana	Moderate	36 places Rocky Boy's Agency Lewistown Fort Belknap Agency Chinook Hays Harlem Parker School Boneau St. Pierre Lewistown Heights and 26 more
Cold Weather AdvisoryEnded Gusts up to 60 mph, wind chills as low as 30 below zero. Issued February 17 Ended February 19, 2026	Montana	Moderate	153 places Rocky Boy's Agency Great Falls Havre Helena Valley West Central Lewistown Malmstrom AFB Shelby Cut Bank North Browning Conrad and 143 more
Winter Weather AdvisoryEnded 2 to 6 inches of snow, with up to 10 inches at mountain peaks. Issued February 15 Ended February 17, 2026	Montana	Moderate	146 places Rocky Boy's Agency Great Falls Havre Helena Valley West Central Malmstrom AFB Big Sky Shelby Cut Bank Montana City North Browning and 136 more
Cold Weather AdvisoryEnded Wind chills as low as 35 below zero. Issued January 21 Ended January 23, 2026	Montana	Moderate	33 places Rocky Boy's Agency Havre Fort Belknap Agency Chinook Hays Harlem Havre North Parker School Boneau St. Pierre and 23 more
Extreme Cold WatchEnded Wind chills as low as 40 below zero. Issued January 21 Ended January 21, 2026	Montana	Severe	33 places Rocky Boy's Agency Havre Fort Belknap Agency Chinook Hays Harlem Havre North Parker School Boneau St. Pierre and 23 more
Winter Weather AdvisoryEnded Around a light glaze of ice. Issued December 24 Ended December 25, 2025	Montana	Moderate	88 places Rocky Boy's Agency Great Falls Havre Malmstrom AFB Shelby Conrad Choteau Sun Prairie Fort Belknap Agency Fort Benton and 78 more
Winter Storm WatchEnded Up to a tenth of an inch of ice. Issued December 24 Ended December 24, 2025	Montana	Severe	88 places Rocky Boy's Agency Great Falls Havre Malmstrom AFB Shelby Conrad Choteau Sun Prairie Fort Belknap Agency Fort Benton and 78 more
Winter Weather AdvisoryEnded Up to 6 inches of snow, gusts up to 75 mph. Issued December 16 Ended December 17, 2025	Montana	Moderate	63 places Rocky Boy's Agency Havre Lewistown Big Sky Fort Belknap Agency West Yellowstone Chinook Hays Harlem Havre North and 53 more
Winter Storm WarningEnded 6 to 12 inches of snow. Issued December 11 Ended December 13, 2025	Montana	Severe	83 places Rocky Boy's Agency Havre Lewistown Shelby Fort Belknap Agency Fort Benton Chinook Rocky Boy West Hays Chester and 73 more
Winter Weather AdvisoryEnded Another 2 to 7 inches of snow, gusts up to 40 mph, 6 to 12 inches of snow, with localized amounts approaching 20 inches in the Island Ranges, gusts up to 35 mph. Issued December 10 Ended December 12, 2025	Montana	Moderate	47 places Rocky Boy's Agency Lewistown Fort Benton Rocky Boy West Hays Big Sandy Stanford Parker School Boneau St. Pierre and 37 more
Winter Storm WatchEnded 2 to 4 inches of snow on Marias Pass, and up to 7 inches at ridge tops, 7 to 12 inches of snow possible along Marias Pass, with over a foot of snow at the higher peaks. Issued December 9 Ended December 13, 2025	Montana	Severe	146 places Rocky Boy's Agency Great Falls Havre Lewistown Malmstrom AFB Shelby Cut Bank North Browning Conrad South Browning and 136 more
Winter Weather AdvisoryEnded 2 to 4 inches of snow on Marias Pass, and up to 7 inches at ridge tops. Issued December 9 Ended December 10, 2025	Montana	Moderate	161 places Rocky Boy's Agency Great Falls Helena Havre Helena Valley Southeast Helena Valley West Central Lewistown Helena Valley Northwest Malmstrom AFB Helena Valley Northeast and 151 more
Winter Weather AdvisoryEnded 2 to 5 inches of snow, gusts up to 40 mph. Issued November 30 Ended December 3, 2025	Montana	Moderate	98 places Rocky Boy's Agency Great Falls Helena Helena Valley Southeast Helena Valley West Central Lewistown Helena Valley Northwest Malmstrom AFB Helena Valley Northeast Big Sky and 88 more
Winter Storm WarningEnded 5 to 9 inches of snow possible. Issued November 26 Ended November 29, 2025	Montana	Severe	88 places Rocky Boy's Agency Great Falls Havre Malmstrom AFB Shelby Conrad Choteau Sun Prairie Fort Belknap Agency Fort Benton and 78 more
Winter Storm WatchEnded 4 to 8 inches of snow possible. Issued November 25 Ended November 27, 2025	Montana	Severe	92 places Rocky Boy's Agency Great Falls Havre Malmstrom AFB Shelby Conrad Choteau Sun Prairie Fort Belknap Agency Fort Benton and 82 more
Winter Weather AdvisoryEnded 4 to 8 inches of snow at Marias Pass, with 12 to 16 inches at the higher peaks. Issued November 22 Ended November 24, 2025	Montana	Moderate	66 places Rocky Boy's Agency Havre Shelby Cut Bank Fort Belknap Agency Chinook Hays Chester Harlem Havre North and 56 more