Carbon County, Montana Hail Map & History
Carbon County was hit as recently as 2026-06-27, 79 days ago. Carbon County is hit in most years. The largest stone on record here is 2 inches, a hen egg and twice the National Weather Service's 1 inch severe criterion, reported on 2025-07-28 near Joliet.
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 Bridger. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Carbon 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 ->How often it hails in Carbon County
NOAA's Storm Prediction Center has logged 21 separate hail days here since 2010 -- 1.2 a year over 17 years of record. Those days carry 38 separate reports between them, two or three on a typical one. 6 of those 17 years produced none at all. The busiest single year was 2018, with 4 hail days. The last five years track the long-run rate, with 5 days since 2022.
Most hail here stays under 2 inches: only 1 of the 21 days on record passed it, 5%, the last on 2025-07-28. Those big days do not follow the county's usual calendar: most of them fall in July, not June. Golf-ball size is rarer still: 1.75 inches or more on 4 of the 21 days.
Across the whole of Montana, see the Montana hail map and history.
Hardest-hit places in Carbon County
Reports cluster nearest Joliet -- 6 of the county's 21 hail days -- then Red Lodge (4), Bridger (3), Fox (3) and Roberts (3). Beyond those, NOAA names Boyd and Roscoe on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| 4 N Red Lodge | 2 | 1.25″ |
| 6 W Joliet | 2 | 1.00″ |
| Roscoe | 2 | 1.00″ |
| Joliet | 1 | 2.00″ |
| 1 Ne Belfry | 1 | 1.75″ |
When it hails in Carbon County
The season runs June through August: 19 of the 21 hail days on record fall in those 3 months (90%). June is the single busiest month, with 8 of them (38%). That peak opens the window: the season starts at its worst and eases off from there. 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 | 2 |
| June | 8 |
| July | 8 |
| August | 3 |
Recent Carbon County hail days
That day put 1 report on the map, the biggest 1 inch near Bridger. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-06-27 | 1.00″ | 1 |
| 2025-07-28 | 2.00″ | 1 |
| 2025-06-16 | 1.25″ | 2 |
| 2025-06-13 | 1.50″ | 4 |
| 2023-07-02 | 1.00″ | 1 |
| 2021-05-28 | 1.50″ | 2 |
| 2019-08-10 | 1.00″ | 1 |
| 2019-07-06 | 1.00″ | 2 |
How to read the Carbon County map
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 inches, which is the purple band. Look up a street address with the hail history by address tool.
Nearby counties
The nearest counties with a page of their own: Stillwater County (42 hail days), Yellowstone County (54) and Sweet Grass County (25). Every one of them takes more hail than Carbon County.
Stillwater County · Yellowstone County · Sweet Grass County
Back to the Montana hail map or the U.S. hail map.
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Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Carbon County, Montana only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.