The most recent reported hail day was 2025-08-15, 350 days ago. Winneshiek County is hit in about half the years on record. The largest stone on record here is 2 inches, a hen egg and twice the National Weather Service's 1 inch severe criterion, reported on 2017-05-15 near Calmar.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Iowa. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2025-08-15, around Calmar. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Winneshiek 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 13 separate hail days here since 2010 -- 0.8 a year over 17 years of record. Those days carry 28 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: 2014 alone produced 3 of the 13 days. The last five years track the long-run rate, with 4 days since 2022.
2 of the 13 days reached 2 inches or more -- 15%, or about one hail day in 6, the last on 2017-05-15. They land in the same month as everything else, May. 5 of the 13 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Iowa, see the Iowa hail map and history.
Reports cluster nearest Calmar -- 5 of the county's 13 hail days -- then Decorah (5), Ridgeway (3), Fort Atkinson (2) and Bluffton (2). Beyond those, NOAA names Ossian on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Calmar | 4 | 2.00″ |
| Ridgeway | 2 | 1.75″ |
| 2 W Decorah | 1 | 2.00″ |
| 4 E Ridgeway | 1 | 1.75″ |
| 4 Ese Decorah | 1 | 1.75″ |
The season runs April through August: 12 of the 13 hail days on record fall in those 5 months (92%). May is the single busiest month, with 3 of them (23%). 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 | 2 |
| May | 3 |
| June | 2 |
| July | 2 |
| August | 3 |
| September | 1 |
That day put 1 report on the map, the biggest 1 inch near Calmar. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2025-08-15 | 1.00″ | 1 |
| 2025-07-02 | 1.00″ | 1 |
| 2024-05-07 | 1.00″ | 1 |
| 2022-06-28 | 1.25″ | 2 |
| 2018-04-13 | 1.00″ | 2 |
| 2017-05-15 | 2.00″ | 4 |
| 2014-08-18 | 1.75″ | 3 |
| 2014-06-29 | 1.75″ | 3 |
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 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: Fayette County (23 hail days), Clayton County (22), Bremer County (20), Fillmore County, Minnesota (25) and Houston County, Minnesota (15). Every one of them takes more hail than Winneshiek County.
Fayette County · Clayton County · Bremer County · Fillmore County, Minnesota · Houston County, Minnesota
Back to the Iowa hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Winneshiek County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.