The most recent reported hail day was 2025-09-22, 312 days ago. Worth County is hit in about half the years on record. 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 2022-05-19 near Lake Mills.
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 2025-09-22, around Grafton. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Worth 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. They carry 22 reports in total: most hail days here are logged from a single spot. 9 of those 17 years produced none at all. One year dominates the record: 2022 alone produced 3 of the 13 days. The last five years have run hotter than the long-run rate: 5 days since 2022, against 0.7 a year before that.
No stone of 2 inches or more has ever been reported in Worth County: all 13 hail days on record topped out below that. Golf-ball size is rarer still: 1.75 inches or more on 3 of the 13 days.
Across the whole of Iowa, see the Iowa hail map and history.
Reports cluster nearest Grafton -- 5 of the county's 13 hail days -- then Manly (4), Northwood (2) and Kensett (2).
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Grafton | 5 | 1.75″ |
| Manly | 2 | 1.75″ |
| 8 Ne Lake Mills | 1 | 1.75″ |
| 3 Wsw Manly | 1 | 1.50″ |
| Hanlontown | 1 | 1.50″ |
The season runs April through July: 12 of the 13 hail days on record fall in those 4 months (92%). May is the single busiest month, with 4 of them (31%). That peak sits inside the window rather than at either end. Hail has also been reported in September, outside that window. Reports span 5 of the 12 calendar months; the other 7 have never produced one.
| Month | Hail days |
|---|---|
| April | 3 |
| May | 4 |
| June | 2 |
| July | 3 |
| September | 1 |
That day put 1 report on the map, the biggest 1 inch near Grafton. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2025-09-22 | 1.00″ | 1 |
| 2025-06-19 | 1.00″ | 1 |
| 2022-07-05 | 1.00″ | 1 |
| 2022-05-19 | 1.75″ | 2 |
| 2022-04-12 | 1.00″ | 1 |
| 2020-07-11 | 1.50″ | 1 |
| 2017-04-09 | 1.75″ | 3 |
| 2016-05-25 | 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, over the state line included: Cerro Gordo County (37 hail days), Mitchell County (13), Winnebago County (18) and Freeborn County, Minnesota (21). Worth County sits in between.
Cerro Gordo County · Mitchell County · Winnebago County · Freeborn 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, Worth County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.