Big Horn County was hit as recently as 2026-06-27, 34 days ago. Big Horn County is hit in most years, and usually several times over. 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 2025-06-13 near Pryor.
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 2026-06-27, around Crow Agency. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Big Horn 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 47 separate hail days here since 2010 -- 2.8 a year over 17 years of record. They carry 83 reports in total: most hail days here are logged from a single spot. 2 of those 17 years produced none at all. The busiest single year was 2019, with 7 hail days. The last five years track the long-run rate, with 11 days since 2022.
5 of the 47 days reached 2 inches or more -- 11%, or about one hail day in 9, the last on 2025-06-13. They land in the same month as everything else, June. Golf-ball size is rarer still: 1.75 inches or more on 11 of the 47 days.
Across the whole of Montana, see the Montana hail map and history.
Reports cluster nearest Hardin -- 18 of the county's 47 hail days -- then Busby (12), Crow Agency (5), Lodge Grass (4) and Fort Smith (4). Beyond those, NOAA names Lame Deer, Decker, Wyola and Pryor on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| 20 S Busby | 4 | 1.75″ |
| 1 WSW Hardin | 3 | 1.50″ |
| 1 ENE Hardin | 3 | 1.25″ |
| 10 Ese Busby | 3 | 1.25″ |
| Hardin | 3 | 1.00″ |
The season runs May through July: 40 of the 47 hail days on record fall in those 3 months (85%). June is the single busiest month, with 17 of them (36%). That peak sits inside the window rather than at either end. 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 | 7 |
| June | 17 |
| July | 16 |
| August | 6 |
| September | 1 |
That day put 1 report on the map, the biggest 1 inch near Crow Agency. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-06-27 | 1.00″ | 1 |
| 2025-08-07 | 1.00″ | 2 |
| 2025-07-05 | 1.75″ | 2 |
| 2025-06-28 | 1.25″ | 1 |
| 2025-06-13 | 2.75″ | 6 |
| 2023-07-11 | 2.50″ | 1 |
| 2023-07-02 | 1.00″ | 1 |
| 2023-06-19 | 1.25″ | 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, over the state line included: Rosebud County (50 hail days), Yellowstone County (53), Musselshell County (30) and Sheridan County, Wyoming (45). Big Horn County sits in between.
Rosebud County · Yellowstone County · Musselshell County · Sheridan County, Wyoming
Back to the Montana hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Big Horn County, Montana only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.