The most recent reported hail day was 2025-08-07, 358 days ago. Stillwater 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 2019-08-11 near Molt.
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 2025-08-07, around Molt. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Stillwater 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 42 separate hail days here since 2010 -- 2.5 a year over 17 years of record. Those days carry 88 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 2018, with 8 hail days. The last five years have been quieter than the long run: 8 days since 2022, against 2.8 a year before that.
Most hail here stays under 2 inches: only 3 of the 42 days on record passed it, 7%, the last on 2019-08-11. Those big days do not follow the county's usual calendar: most of them fall in June, not July. 14 of the 42 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 Columbus -- 16 of the county's 42 hail days -- then Reed Point (11), Rapelje (8), Absarokee (4) and Molt (3). Beyond those, NOAA names Fishtail and Nye on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Rapelje | 8 | 1.75″ |
| 5 N Reed Point | 7 | 1.75″ |
| Columbus | 3 | 1.25″ |
| 12 N Reed Point | 2 | 2.00″ |
| 6 Sse Columbus | 2 | 2.00″ |
The season runs May through July: 37 of the 42 hail days on record fall in those 3 months (88%). July is the single busiest month, with 16 of them (38%). That peak closes the window: the season builds all the way to its worst month and then stops. Hail has also been reported in August, outside that window. Reports span 4 of the 12 calendar months; the other 8 have never produced one.
| Month | Hail days |
|---|---|
| May | 8 |
| June | 13 |
| July | 16 |
| August | 5 |
That day put 1 report on the map, the biggest 1.75 inches near Molt. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2025-08-07 | 1.75″ | 1 |
| 2025-06-13 | 1.75″ | 4 |
| 2024-08-06 | 1.00″ | 1 |
| 2023-08-06 | 1.50″ | 1 |
| 2022-07-24 | 1.00″ | 1 |
| 2022-07-15 | 1.00″ | 1 |
| 2022-07-04 | 1.00″ | 1 |
| 2022-07-03 | 1.75″ | 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: Carbon County (21 hail days), Sweet Grass County (25) and Yellowstone County (53). Stillwater County sits in between.
Carbon County · Sweet Grass County · Yellowstone 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, Stillwater County, Montana only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.