The most recent reported hail day was 2025-07-31, 365 days ago. Cascade 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 2022-07-07 near Sun River.
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 2025-07-31, around Great Falls. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Cascade 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 44 separate hail days here since 2010 -- 2.6 a year over 17 years of record. Those days carry 131 separate reports between them, two or three on a typical one. 4 of those 17 years produced none at all. One year dominates the record: 2013 alone produced 9 of the 44 days. The last five years track the long-run rate, with 10 days since 2022.
5 of the 44 days reached 2 inches or more -- 11%, or about one hail day in 9, the last on 2022-07-07. Those big days do not follow the county's usual calendar: most of them fall in August, not June. 16 of the 44 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 Great Falls -- 12 of the county's 44 hail days -- then Monarch (7), Vaughn (6), Ulm (6) and Malmstrom Afb (6). Beyond those, NOAA names Black Eagle, Sun Prairie, Belt, Stockett, Sun River, Fort Shaw, Cascade, Highwood and Floweree on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Great Falls | 6 | 1.75″ |
| Belt | 3 | 1.75″ |
| 2 WNW Great Falls | 3 | 1.00″ |
| 3 NW Sun River | 2 | 3.00″ |
| 1 WNW Black Eagle | 2 | 2.00″ |
The season runs May through July: 36 of the 44 hail days on record fall in those 3 months (82%). June is the single busiest month, with 19 of them (43%). 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 | 6 |
| June | 19 |
| July | 11 |
| August | 5 |
| September | 3 |
That day put 2 reports on the map, the biggest 1.25 inches near Great Falls. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2025-07-31 | 1.25″ | 2 |
| 2025-07-29 | 1.00″ | 1 |
| 2025-07-28 | 1.00″ | 1 |
| 2025-06-15 | 1.50″ | 11 |
| 2024-06-21 | 1.50″ | 1 |
| 2023-07-30 | 1.25″ | 4 |
| 2023-07-29 | 1.75″ | 1 |
| 2023-06-05 | 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: Chouteau County (25 hail days), Teton County (22) and Lewis and Clark County (22). Cascade County takes more hail than any of them.
Chouteau County · Teton County · Lewis and Clark 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, Cascade County, Montana only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.