The most recent reported hail day was 2026-04-23, 99 days ago. Calhoun County is hit in most years. The largest stone on record here is 4 inches, a grapefruit and 4 times the National Weather Service's 1 inch severe criterion, reported on 2014-06-30 near Rockwell City.
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 2026-04-23, around Rockwell City. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Calhoun 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 26 separate hail days here since 2010 -- 1.5 a year over 17 years of record. They carry 43 reports in total: most hail days here are logged from a single spot. 3 of those 17 years produced none at all. The busiest single year was 2018, with 3 hail days. The last five years have been quieter than the long run: 4 days since 2022, against 1.8 a year before that.
4 of the 26 days reached 2 inches or more -- 15%, or about one hail day in 6, the last on 2015-05-10. Those big days do not follow the county's usual calendar: most of them fall in May, not June. Golf-ball size is rarer still: 1.75 inches or more on 5 of the 26 days.
Across the whole of Iowa, see the Iowa hail map and history.
Reports cluster nearest Rockwell City -- 6 of the county's 26 hail days -- then Manson (6), Jolley (4), Pomeroy (4) and Lake City (3). Beyond those, NOAA names Yetter, Fonda and Lohrville on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Manson | 5 | 2.50″ |
| Rockwell City | 4 | 4.00″ |
| 4 Sse Fonda | 2 | 1.00″ |
| Pomeroy | 2 | 1.00″ |
| 4 N Yetter | 1 | 2.75″ |
The season runs April through September: 23 of the 26 hail days on record fall in those 6 months (88%). June is the single busiest month, with 7 of them (27%). That peak sits inside the window rather than at either end. Hail has also been reported in March and October, outside that window. Reports span 8 of the 12 calendar months; the other 4 have never produced one.
| Month | Hail days |
|---|---|
| March | 2 |
| April | 4 |
| May | 6 |
| June | 7 |
| July | 1 |
| August | 2 |
| September | 3 |
| October | 1 |
That day put 1 report on the map, the biggest 1 inch near Rockwell City. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-04-23 | 1.00″ | 1 |
| 2025-03-14 | 1.00″ | 1 |
| 2024-05-23 | 1.00″ | 1 |
| 2023-07-03 | 1.00″ | 1 |
| 2020-03-28 | 1.50″ | 4 |
| 2019-09-29 | 1.00″ | 1 |
| 2018-06-11 | 1.00″ | 1 |
| 2018-06-06 | 1.00″ | 2 |
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 4 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: Pocahontas County (22 hail days), Webster County (38) and Sac County (20). Calhoun County sits in between.
Pocahontas County · Webster County · Sac County
Back to the Iowa hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Calhoun County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.