The most recent reported hail day was 2026-04-17, 105 days ago. Green County is hit in about half the years on record. 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 2020-04-07 near Browntown.
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 2026-04-17, around Monroe. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Green 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 18 separate hail days here since 2010 -- 1.1 a year over 17 years of record. Those days carry 41 separate reports between them, two or three on a typical one. 9 of those 17 years produced none at all. One year dominates the record: 2024 alone produced 5 of the 18 days. The last five years have run hotter than the long-run rate: 14 days since 2022, against 0.3 a year before that.
4 of the 18 days reached 2 inches or more -- 22%, or about one hail day in 4, the last on 2026-04-17. They land in the same month as everything else, April. 5 of the 18 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 Monroe -- 5 of the county's 18 hail days -- then New Glarus (5), Brooklyn (3), Browntown (2) and Albany (2). Beyond those, NOAA names Monticello and Oneco on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| New Glarus | 3 | 1.50″ |
| Monroe | 2 | 2.75″ |
| Monticello | 2 | 2.00″ |
| 1 S Monroe | 2 | 1.75″ |
| 1 N Monroe | 2 | 1.25″ |
The season runs April through August: 16 of the 18 hail days on record fall in those 5 months (89%). April is the single busiest month, with 7 of them (39%). That peak opens the window: the season starts at its worst and eases off from there. Hail has also been reported in February and March, outside that window. Reports span 7 of the 12 calendar months; the other 5 have never produced one.
| Month | Hail days |
|---|---|
| February | 1 |
| March | 1 |
| April | 7 |
| May | 3 |
| June | 1 |
| July | 2 |
| August | 3 |
That day put 4 reports on the map, the biggest 2.75 inches near Monroe. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-04-17 | 2.75″ | 4 |
| 2026-03-10 | 1.00″ | 1 |
| 2025-08-16 | 2.00″ | 1 |
| 2025-05-15 | 1.00″ | 1 |
| 2025-04-18 | 1.50″ | 1 |
| 2025-04-17 | 2.75″ | 8 |
| 2024-07-15 | 1.50″ | 3 |
| 2024-07-13 | 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, over the state line included: Rock County (32 hail days), Dane County (52), Iowa County (18) and Stephenson County, Illinois (21). Green County sits in between.
Rock County · Dane County · Iowa County · Stephenson County, Illinois
Back to the Wisconsin hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Green County, Wisconsin only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.