Powell County, Montana Hail Map & History
Powell County was hit as recently as 2026-09-06, 8 days ago. Powell County is hit in most years. The largest stone on record here is 1.75 inches, a golf ball and 1.8 times the National Weather Service's 1 inch severe criterion, reported on 2026-09-06 near Avon.
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 2026-09-06, around Avon. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Powell 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 Powell County
NOAA's Storm Prediction Center has logged 15 separate hail days here since 2010 -- 0.9 a year over 17 years of record. They carry 18 reports in total: most hail days here are logged from a single spot. 5 of those 17 years produced none at all. The busiest single year was 2019, with 2 hail days. The last five years have been quieter than the long run: 3 days since 2022, against 1.0 a year before that.
No stone of 2 inches or more has ever been reported in Powell County: all 15 hail days on record topped out below that. Golf-ball size is rarer still: 1.75 inches or more on 2 of the 15 days.
Across the whole of Montana, see the Montana hail map and history.
Hardest-hit places in Powell County
Reports cluster nearest Avon -- 3 of the county's 15 hail days -- then Helmville (3), Deer Lodge (3) and Ovando (2).
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Avon | 2 | 1.75″ |
| 4 Wnw Ovando | 1 | 1.75″ |
| 1 Ese Elliston | 1 | 1.50″ |
| 4 Se Helmville | 1 | 1.50″ |
| 6 N Avon | 1 | 1.50″ |
When it hails in Powell County
The season runs May through July: 13 of the 15 hail days on record fall in those 3 months (87%). July is the single busiest month, with 9 of them (60%). That peak closes the window: the season builds all the way to its worst month and then stops. 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 | 2 |
| June | 2 |
| July | 9 |
| August | 1 |
| September | 1 |
Recent Powell County hail days
That day put 1 report on the map, the biggest 1.75 inches near Avon. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-09-06 | 1.75″ | 1 |
| 2023-05-22 | 1.00″ | 1 |
| 2022-07-08 | 1.50″ | 1 |
| 2021-07-21 | 1.75″ | 2 |
| 2019-07-14 | 1.50″ | 1 |
| 2019-07-13 | 1.25″ | 1 |
| 2018-07-27 | 1.25″ | 1 |
| 2017-05-06 | 1.00″ | 1 |
How to read the Powell 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 1.75 inches, which is the red band. Look up a street address with the hail history by address tool.
Nearby counties
The nearest counties with a page of their own: Lewis and Clark County (23 hail days), Jefferson County (18) and Missoula County (23). Every one of them takes more hail than Powell County.
Lewis and Clark County · Jefferson County · Missoula 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, Powell County, Montana only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.