Sweet Grass County, Montana tornadoes
2 confirmed tornadoes since NOAA records began in 1950 (the first here in 1965). Most recent: May 20, 1973, F0. 2026 so far: 0 preliminary reports preliminary
Every tornado path in the county
Each path is a straight line from where the tornado started to where it ended, which is all most NOAA records hold. Tap a path for its details.
At a glance
Deaths and injuries are NOAA's totals for each tornado's whole path, which can extend beyond Sweet Grass County.
When tornadoes hit here
By month
May is the peak month, with 1 of 2 tornadoes.
By time of day
Most often around 1:00 PM. Times as recorded by NOAA, mostly Central Standard Time.
By year, 1950 to 2025
The line is the five-year average. Tornadoes before about 1953 were under-reported, and better radar since the 1990s finds more weak ones.
By rating
Ratings before February 2007 use the original F scale; the numbers line up with today's EF scale. Unknown means NOAA could not assign a rating.
Notable tornadoes
All 2 tornadoes, newest first
| Date | Rating | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|
| May 20, 1973 | F0 | 0.1 mi | 17 yd | 0 | 0 |
| Aug 22, 1965 | F1 | 1.5 mi | 10 yd | 0 | 0 |
Nearby counties
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Source: NOAA Storm Prediction Center severe weather database, 1950 to 2025, and SPC preliminary reports for 2026. Page built October 12, 2026.