The most recent reported hail day was 2026-04-21, 101 days ago. Milwaukee County is hit in most years. The largest stone on record here is 3 inches, a teacup and 3 times the National Weather Service's 1 inch severe criterion, reported on 2015-08-02 near Franklin.
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 2026-04-21, around Greenfield. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Milwaukee 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 29 separate hail days here since 2010 -- 1.7 a year over 17 years of record. Those days carry 60 separate reports between them, two or three on a typical one. 4 of those 17 years produced none at all. The busiest single year was 2023, with 4 hail days. The last five years have run hotter than the long-run rate: 12 days since 2022, against 1.4 a year before that.
Most hail here stays under 2 inches: only 2 of the 29 days on record passed it, 7%, the last on 2015-08-02. Those big days do not follow the county's usual calendar: most of them fall in May, not April. Golf-ball size is rarer still: 1.75 inches or more on 3 of the 29 days.
Across the whole of Wisconsin, see the Wisconsin hail map and history.
Reports cluster nearest Milwaukee -- 8 of the county's 29 hail days -- then Franklin (7), West Allis (7), Oak Creek (4) and South Milwaukee (4). Beyond those, NOAA names Greendale, Greenfield and Saint Francis on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Franklin | 4 | 3.00″ |
| West Allis | 4 | 1.00″ |
| South Milwaukee | 3 | 1.50″ |
| 1 E Oak Creek | 2 | 1.25″ |
| Greendale | 2 | 1.25″ |
The season runs April through August: 24 of the 29 hail days on record fall in those 5 months (83%). April is the single busiest month, with 9 of them (31%). That peak opens the window: the season starts at its worst and eases off from there. Hail has also been reported in September and November, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| April | 9 |
| May | 3 |
| June | 6 |
| August | 6 |
| September | 3 |
| November | 2 |
That day put 3 reports on the map, the biggest 1 inch near Greenfield. 3 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-04-21 | 1.00″ | 3 |
| 2026-04-15 | 1.00″ | 1 |
| 2026-04-14 | 1.00″ | 1 |
| 2025-05-15 | 1.75″ | 6 |
| 2024-06-24 | 1.00″ | 1 |
| 2024-05-07 | 1.50″ | 7 |
| 2023-08-24 | 1.25″ | 2 |
| 2023-06-29 | 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 3 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: Racine County (16 hail days), Waukesha County (33) and Washington County (25). Milwaukee County sits in between.
Racine County · Waukesha County · Washington 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, Milwaukee County, Wisconsin only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.