The most recent reported hail day was 2025-06-16 -- 1 year ago, with nothing reported since. Sweet Grass County is hit in about half the years on record. 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 2010-06-30 near Melville.
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 2025-06-16, around Big Timber. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Sweet Grass County addresses inside a hail swath above your size threshold into a door-knock list you can export, scoped to your approved markets.
Get free access Check an addressOur US-based call center calls the homeowners in this storm and books roof inspections straight onto your calendar. You work the storm; we fill the schedule. We dial -- you do not have to knock a single door.
See call-center options ->NOAA's Storm Prediction Center has logged 25 separate hail days here since 2010 -- 1.5 a year over 17 years of record. Those days carry 63 separate reports between them, two or three on a typical one. 8 of those 17 years produced none at all. One year dominates the record: 2013 alone produced 6 of the 25 days. The last five years have been quieter than the long run: 4 days since 2022, against 1.8 a year before that.
4 of the 25 days reached 2 inches or more -- 16%, or about one hail day in 6, the last on 2019-08-11. They land in the same month as everything else, June. 7 of the 25 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 Big Timber -- 12 of the county's 25 hail days -- then Melville (7), Rapelje (7), Ese Big Timber (3) and Greycliff (2). That one town is named on 48% of them.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| 12 WNW Rapelje | 5 | 2.50″ |
| Big Timber | 5 | 2.00″ |
| Ese Big Timber | 3 | 1.50″ |
| 9 Nnw Big Timber | 2 | 2.00″ |
| 11 N Big Timber | 2 | 1.75″ |
The season runs June through August: 21 of the 25 hail days on record fall in those 3 months (84%). June is the single busiest month, with 10 of them (40%). That peak opens the window: the season starts at its worst and eases off from there. Hail has also been reported in May and September, outside that window. Reports span 5 of the 12 calendar months; the other 7 have never produced one.
| Month | Hail days |
|---|---|
| May | 2 |
| June | 10 |
| July | 8 |
| August | 3 |
| September | 2 |
That day put 1 report on the map, the biggest 1 inch near Big Timber. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2025-06-16 | 1.00″ | 1 |
| 2025-06-14 | 1.25″ | 1 |
| 2022-07-07 | 1.00″ | 1 |
| 2022-07-04 | 1.00″ | 1 |
| 2019-08-11 | 2.00″ | 5 |
| 2019-08-10 | 1.00″ | 1 |
| 2019-06-30 | 1.25″ | 2 |
| 2018-07-28 | 1.00″ | 1 |
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: Stillwater County (42 hail days), Park County (14) and Wheatland County (16). Sweet Grass County sits in between.
Stillwater County · Park County · Wheatland 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, Sweet Grass County, Montana only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.