Cerro Gordo County was hit as recently as 2026-05-15, 77 days ago. Cerro Gordo County is hit in most years, and usually several times over. 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 2026-05-15 near Thornton.
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 2026-05-15, around Thornton. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Cerro Gordo 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 37 separate hail days here since 2010 -- 2.2 a year over 17 years of record. Those days carry 71 separate reports between them, two or three on a typical one. 2 of those 17 years produced none at all. The busiest single year was 2018, with 5 hail days. The last five years track the long-run rate, with 9 days since 2022.
No stone of 2 inches or more has ever been reported in Cerro Gordo County: all 37 hail days on record topped out below that. Golf-ball size is rarer still: 1.75 inches or more on 5 of the 37 days.
Across the whole of Iowa, see the Iowa hail map and history.
Reports cluster nearest Mason City -- 18 of the county's 37 hail days -- then Clear Lake (9), Ventura (7), Thornton (4) and Rock Falls (4). That one town is named on 49% of them. Beyond those, NOAA names Swaledale and Rockwell on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| 1 Nnw Mason City | 7 | 1.00″ |
| Mason City | 6 | 1.50″ |
| Clear Lake | 4 | 1.75″ |
| 1 Sw Clear Lake | 2 | 1.00″ |
| 1 W Ventura | 2 | 1.00″ |
The season runs April through August: 30 of the 37 hail days on record fall in those 5 months (81%). May is the single busiest month, with 10 of them (27%). That peak sits inside the window rather than at either end. Hail has also been reported in March, September 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 | 6 |
| May | 10 |
| June | 6 |
| July | 5 |
| August | 3 |
| September | 3 |
| October | 2 |
That day put 5 reports on the map, the biggest 1.75 inches near Thornton. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-05-15 | 1.75″ | 5 |
| 2026-04-13 | 1.00″ | 1 |
| 2025-09-16 | 1.00″ | 1 |
| 2025-06-19 | 1.00″ | 1 |
| 2025-04-28 | 1.00″ | 1 |
| 2024-10-24 | 1.75″ | 3 |
| 2023-08-11 | 1.00″ | 1 |
| 2023-03-31 | 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 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: Worth County (13 hail days), Hancock County (29) and Floyd County (29). Cerro Gordo County takes more hail than any of them.
Worth County · Hancock County · Floyd 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, Cerro Gordo County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.