The most recent reported hail day was 2025-08-07, 358 days ago. Yellowstone County is hit in most years, often more than once. The largest stone on record here is 3 inches, a teacup and 3 times the National Weather Service's 1 inch severe criterion, reported on 2019-08-11 near Billings.
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 Yellowstone 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 53 separate hail days here since 2010 -- 3.1 a year over 17 years of record. Those days carry 226 separate reports between them, better than three on a typical one. 3 of those 17 years produced none at all. The busiest single year was 2018, with 7 hail days. The last five years track the long-run rate, with 14 days since 2022.
8 of the 53 days reached 2 inches or more -- 15%, or about one hail day in 7, the last on 2022-07-04. They land in the same month as everything else, July. 23 of the 53 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 Billings -- 26 of the county's 53 hail days -- then Shepherd (12), Laurel (12), Pompeys Pillar (9) and Custer (6). That one town is named on 49% of them. Beyond those, NOAA names Worden, Acton, Huntley, Ballantine, Molt and Billings West End on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Shepherd | 8 | 2.00″ |
| Billings | 7 | 3.00″ |
| 3 Nne Billings | 7 | 1.75″ |
| 6 W Billings | 6 | 1.75″ |
| 7 W Billings | 6 | 1.25″ |
The season runs May through July: 45 of the 53 hail days on record fall in those 3 months (85%). July is the single busiest month, with 20 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 and September, outside that window. Reports span 5 of the 12 calendar months; the other 7 have never produced one.
| Month | Hail days |
|---|---|
| May | 9 |
| June | 16 |
| July | 20 |
| August | 7 |
| September | 1 |
That day put 19 reports 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″ | 19 |
| 2025-07-28 | 1.75″ | 5 |
| 2025-07-23 | 1.00″ | 1 |
| 2025-07-21 | 1.75″ | 1 |
| 2025-06-16 | 1.50″ | 3 |
| 2024-08-06 | 1.00″ | 1 |
| 2024-06-27 | 1.75″ | 1 |
| 2024-06-23 | 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 3 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: Musselshell County (30 hail days), Stillwater County (42) and Carbon County (21). Yellowstone County takes more hail than any of them.
Musselshell County · Stillwater County · Carbon 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, Yellowstone County, Montana only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.