Jackson County was hit as recently as 2026-05-27, 65 days ago. Jackson County is hit in most years. The largest stone on record here is 2.5 inches, a tennis ball and 2.5 times the National Weather Service's 1 inch severe criterion, reported on 2026-04-14 near Millston.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Wisconsin. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-05-27, around Black River Falls. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Jackson 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 20 separate hail days here since 2010 -- 1.2 a year over 17 years of record. They carry 35 reports in total: most hail days here are logged from a single spot. 4 of those 17 years produced none at all. One year dominates the record: 2017 alone produced 4 of the 20 days. The last five years track the long-run rate, with 5 days since 2022.
3 of the 20 days reached 2 inches or more -- 15%, or about one hail day in 7, the last on 2026-04-14. Those big days do not follow the county's usual calendar: most of them fall in April, not May. 7 of the 20 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Wisconsin, see the Wisconsin hail map and history.
Reports cluster nearest Black River Falls -- 5 of the county's 20 hail days -- then Humbird (4), Osseo (2), Alma Center (2) and Taylor (2). Beyond those, NOAA names Merrillan on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Black River Falls | 4 | 2.00″ |
| 6 NW Humbird | 3 | 1.75″ |
| 7 WNW Humbird | 2 | 1.75″ |
| Alma Center | 2 | 1.00″ |
| Merrillan | 2 | 1.00″ |
The season runs April through August: 17 of the 20 hail days on record fall in those 5 months (85%). May is the single busiest month, with 6 of them (30%). That peak sits inside the window rather than at either end. Hail has also been reported in September, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| April | 3 |
| May | 6 |
| June | 4 |
| July | 2 |
| August | 2 |
| September | 3 |
That day put 2 reports on the map, the biggest 1 inch near Black River Falls. 3 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-05-27 | 1.00″ | 2 |
| 2026-04-14 | 2.50″ | 2 |
| 2026-04-13 | 1.75″ | 2 |
| 2025-05-15 | 1.75″ | 2 |
| 2024-05-18 | 1.50″ | 1 |
| 2021-06-24 | 1.00″ | 1 |
| 2021-05-02 | 1.00″ | 1 |
| 2020-06-02 | 1.75″ | 2 |
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 2.5 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: Trempealeau County (43 hail days), Clark County (22) and Monroe County (25). Every one of them takes more hail than Jackson County.
Trempealeau County · Clark County · Monroe County
Back to the Wisconsin hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Jackson County, Wisconsin only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.