Lewis and Clark County was hit as recently as 2026-06-25, 36 days ago. Lewis and Clark 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 2014-08-15 near Helena.
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 2026-06-25, around Helena. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Lewis and Clark County addresses inside a hail swath above your size threshold into a door-knock list you can export, scoped to your approved markets.
Get free access Check an addressOur US-based call center calls the homeowners in this storm and books roof inspections straight onto your calendar. You work the storm; we fill the schedule. We dial -- you do not have to knock a single door.
See call-center options ->NOAA's Storm Prediction Center has logged 22 separate hail days here since 2010 -- 1.3 a year over 17 years of record. They carry 33 reports in total: most hail days here are logged from a single spot. 3 of those 17 years produced none at all. The busiest single year was 2013, with 4 hail days. The last five years have been quieter than the long run: 3 days since 2022, against 1.6 a year before that.
No stone of 2 inches or more has ever been reported in Lewis and Clark County: all 22 hail days on record topped out below that. Golf-ball size is rarer still: 1.75 inches or more on 3 of the 22 days.
Across the whole of Montana, see the Montana hail map and history.
Reports cluster nearest Marysville -- 7 of the county's 22 hail days -- then Helena (6), Augusta (5), East Helena (4) and Lincoln (3). Beyond those, NOAA names Wolf Creek on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Marysville | 3 | 1.00″ |
| 17 Wnw Augusta | 2 | 1.75″ |
| 13 S Marysville | 2 | 1.25″ |
| 8 Wsw Helena | 1 | 1.75″ |
| 9 Nne East Helena | 1 | 1.75″ |
The season runs June through August: 18 of the 22 hail days on record fall in those 3 months (82%). June is the single busiest month, with 8 of them (36%). That peak opens the window: the season starts at its worst and eases off from there. Hail has also been reported in May and September, outside that window. Reports span 5 of the 12 calendar months; the other 7 have never produced one.
| Month | Hail days |
|---|---|
| May | 3 |
| June | 8 |
| July | 6 |
| August | 4 |
| September | 1 |
That day put 3 reports on the map, the biggest 1 inch near Helena. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-06-25 | 1.00″ | 3 |
| 2024-08-06 | 1.50″ | 2 |
| 2022-07-08 | 1.00″ | 2 |
| 2021-07-21 | 1.00″ | 2 |
| 2020-05-19 | 1.00″ | 1 |
| 2019-08-11 | 1.00″ | 1 |
| 2018-05-31 | 1.00″ | 1 |
| 2018-05-26 | 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 1.75 inches, which is the red band. Look up a street address with the hail history by address tool.
The nearest counties with a page of their own: Powell County (14 hail days), Jefferson County (18) and Cascade County (44). Lewis and Clark County sits in between.
Powell County · Jefferson County · Cascade 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, Lewis and Clark County, Montana only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.