The most recent reported hail day was 2025-07-05, 391 days ago. Rosebud County is hit in most years, often more than once. The largest stone on record here is 2.75 inches, a baseball and 2.8 times the National Weather Service's 1 inch severe criterion, reported on 2023-05-24 near Lame Deer.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Montana. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2025-07-05, around Lame Deer. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Rosebud County addresses inside a hail swath above your size threshold into a door-knock list you can export, scoped to your approved markets.
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See call-center options ->NOAA's Storm Prediction Center has logged 50 separate hail days here since 2010 -- 2.9 a year over 17 years of record. Those days carry 92 separate reports between them, two or three on a typical one. 3 of those 17 years produced none at all. The busiest single year was 2010, with 7 hail days. The last five years have been quieter than the long run: 8 days since 2022, against 3.5 a year before that.
8 of the 50 days reached 2 inches or more -- 16%, or about one hail day in 6, the last on 2023-05-24. Those big days do not follow the county's usual calendar: most of them fall in May, not June. 23 of the 50 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Montana, see the Montana hail map and history.
Reports cluster nearest Colstrip -- 16 of the county's 50 hail days -- then Birney (7), Ashland (7), Forsyth (6) and Lame Deer (5). Beyond those, NOAA names Melstone, Nnw Birney, Angela, Miles City, Hathaway, Rock Springs and Vananda on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Colstrip | 5 | 1.50″ |
| Nnw Birney | 3 | 2.75″ |
| 17 Sse Birney | 3 | 1.75″ |
| Forsyth | 3 | 1.50″ |
| Rock Springs | 3 | 1.50″ |
The season runs May through July: 42 of the 50 hail days on record fall in those 3 months (84%). June is the single busiest month, with 17 of them (34%). That peak sits inside the window rather than at either end. Hail has also been reported in April, August and September, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| April | 1 |
| May | 8 |
| June | 17 |
| July | 17 |
| August | 5 |
| September | 2 |
That day put 1 report on the map, the biggest 1 inch near Lame Deer. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2025-07-05 | 1.00″ | 1 |
| 2024-08-21 | 1.00″ | 1 |
| 2024-06-27 | 1.50″ | 2 |
| 2023-07-11 | 1.75″ | 1 |
| 2023-06-19 | 1.50″ | 1 |
| 2023-05-24 | 2.75″ | 2 |
| 2022-07-09 | 2.00″ | 1 |
| 2022-07-04 | 1.50″ | 2 |
The colored swath is NOAA's MRMS radar estimate of the largest hail per ~1 km cell; the dots are SPC ground reports. Yellow is about an inch, red 1.5 to 2″, purple 2″ and up (hail size vs roof damage). On this county's worst day the reports reached 2.75 inches, which is the purple band. Look up a street address with the hail history by address tool.
The nearest counties with a page of their own: Big Horn County (47 hail days), Custer County (43) and Powder River County (60). Rosebud County sits in between.
Big Horn County · Custer County · Powder River County
Back to the Montana hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Rosebud County, Montana only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.