The most recent reported hail day was 2025-08-20, 345 days ago. Prairie County is hit in most years. 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 2021-06-10 near McCloud.
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 2025-08-20, around Mccloud. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Prairie 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 33 separate hail days here since 2010 -- 1.9 a year over 17 years of record. They carry 52 reports in total: most hail days here are logged from a single spot. 4 of those 17 years produced none at all. The busiest single year was 2022, with 5 hail days. The last five years track the long-run rate, with 8 days since 2022.
4 of the 33 days reached 2 inches or more -- 12%, or about one hail day in 8, the last on 2021-06-10. Those big days do not follow the county's usual calendar: most of them fall in June, not July. 10 of the 33 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 Mccloud -- 13 of the county's 33 hail days -- then Mildred (12), Terry (10), Calypso (3) and Fallon (3).
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| 11 SW Mildred | 4 | 2.50″ |
| 10 Wnw McCloud | 3 | 3.00″ |
| Terry | 3 | 1.75″ |
| 12 Nne McCloud | 3 | 1.25″ |
| 10 Nne McCloud | 3 | 1.00″ |
The season runs June through August: 30 of the 33 hail days on record fall in those 3 months (91%). July is the single busiest month, with 17 of them (52%). That peak sits inside the window rather than at either end. Hail has also been reported in May, outside that window. Reports span 4 of the 12 calendar months; the other 8 have never produced one.
| Month | Hail days |
|---|---|
| May | 3 |
| June | 7 |
| July | 17 |
| August | 6 |
That day put 1 report on the map, the biggest 1 inch near Mccloud. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2025-08-20 | 1.00″ | 1 |
| 2025-07-25 | 1.75″ | 2 |
| 2025-07-20 | 1.50″ | 3 |
| 2022-07-15 | 1.00″ | 1 |
| 2022-07-09 | 1.00″ | 2 |
| 2022-07-05 | 1.00″ | 1 |
| 2022-07-03 | 1.25″ | 1 |
| 2022-07-02 | 1.00″ | 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 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: Dawson County (37 hail days), Custer County (43) and Wibaux County (28). Prairie County sits in between.
Dawson County · Custer County · Wibaux 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, Prairie County, Montana only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.