Hamilton County, Iowa Hail Map & History
Hamilton County was hit as recently as 2026-07-20, 56 days ago. Hamilton County is hit in about half the years on record. The largest stone on record here is 2.75 inches, a baseball and 2.8 times the National Weather Service's 1 inch severe criterion, reported on 2014-06-30 near Stanhope.
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 2026-07-20, around Ellsworth. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Hamilton 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 ->How often it hails in Hamilton County
NOAA's Storm Prediction Center has logged 14 separate hail days here since 2010 -- 0.8 a year over 17 years of record. Those days carry 33 separate reports between them, two or three on a typical one. 8 of those 17 years produced none at all. One year dominates the record: 2014 alone produced 3 of the 14 days. The last five years have been quieter than the long run: 2 days since 2022, against 1.0 a year before that.
2 of the 14 days reached 2 inches or more -- 14%, or about one hail day in 7, the last on 2026-07-20. Those big days do not follow the county's usual calendar: most of them fall in June, not July. 5 of the 14 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Iowa, see the Iowa hail map and history.
Hardest-hit places in Hamilton County
Reports cluster nearest Jewell -- 5 of the county's 14 hail days -- then Stratford (4), Stanhope (3), Kamrar (3) and Ellsworth (2). Beyond those, NOAA names Woolstock, Webster City and Webster City Airp on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Stanhope | 3 | 2.75″ |
| Jewell | 3 | 1.75″ |
| 1 S Stratford | 1 | 2.50″ |
| 1 ENE Ellsworth | 1 | 2.00″ |
| 1 S Woolstock | 1 | 1.75″ |
When it hails in Hamilton County
The season runs April through August: 13 of the 14 hail days on record fall in those 5 months (93%). July is the single busiest month, with 4 of them (29%). 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 | 2 |
| June | 3 |
| July | 4 |
| August | 2 |
| September | 1 |
Recent Hamilton County hail days
That day put 3 reports on the map, the biggest 2 inches near Ellsworth. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-07-20 | 2.00″ | 3 |
| 2024-07-06 | 1.25″ | 1 |
| 2019-09-14 | 1.00″ | 1 |
| 2018-08-01 | 1.00″ | 1 |
| 2018-06-06 | 1.75″ | 6 |
| 2017-05-15 | 1.50″ | 2 |
| 2016-05-30 | 1.00″ | 1 |
| 2014-06-30 | 2.75″ | 5 |
How to read the Hamilton County map
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 2.75 inches, which is the purple band. Look up a street address with the hail history by address tool.
Nearby counties
The nearest counties with a page of their own: Webster County (38 hail days), Boone County (26) and Story County (37). Every one of them takes more hail than Hamilton County.
Webster County · Boone County · Story County
Back to the Iowa hail map or the U.S. hail map.
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Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Hamilton County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.