Carter County was hit as recently as 2026-07-02, 29 days ago. Carter County is hit in most years, and usually several times over. The largest stone on record here is 4.25 inches and 4.2 times the National Weather Service's 1 inch severe criterion, reported on 2015-06-19 near Hammond.
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 2026-07-02, around Alzada. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Carter 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 60 separate hail days here since 2010 -- 3.5 a year over 17 years of record. Those days carry 112 separate reports between them, two or three on a typical one. 2 of those 17 years produced none at all. The busiest single year was 2011, with 9 hail days. The last five years have been quieter than the long run: 10 days since 2022, against 4.2 a year before that.
14 of the 60 days reached 2 inches or more -- 23%, or about one hail day in 4, the last on 2026-06-27. They land in the same month as everything else, June. 28 of the 60 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 Alzada -- 17 of the county's 60 hail days -- then Ekalaka (14), Ridgeway (10), Hammond (8) and Belltower (5). Beyond those, NOAA names Albion, Ridge, Belle Creek, Mill Iron, Powderville, Boyes, Ridgway and Capitol on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| 1 E Ridgeway | 5 | 2.00″ |
| 16 ESE Powderville | 3 | 3.00″ |
| Ekalaka | 3 | 2.50″ |
| 14 W Alzada | 3 | 1.75″ |
| 2 Nne Albion | 3 | 1.75″ |
The season runs June through August: 51 of the 60 hail days on record fall in those 3 months (85%). June is the single busiest month, with 22 of them (37%). That peak opens the window: the season starts at its worst and eases off from there. Hail has also been reported in April, May and September, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| April | 1 |
| May | 7 |
| June | 22 |
| July | 21 |
| August | 8 |
| September | 1 |
That day put 1 report on the map, the biggest 1 inch near Alzada. 3 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-07-02 | 1.00″ | 1 |
| 2026-06-27 | 2.00″ | 4 |
| 2026-06-07 | 3.00″ | 3 |
| 2025-07-19 | 1.75″ | 1 |
| 2025-06-20 | 2.50″ | 3 |
| 2025-04-27 | 1.50″ | 1 |
| 2023-05-26 | 1.00″ | 1 |
| 2022-07-10 | 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 4.25 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: Powder River County (60 hail days), Fallon County (41), Custer County (43), Harding County, South Dakota (81) and Crook County, Wyoming (123). Carter County sits in between.
Powder River County · Fallon County · Custer County · Harding County, South Dakota · Crook 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, Carter County, Montana only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.