The most recent reported hail day was 2026-03-30, 123 days ago. Cass County is hit in most years. The largest stone on record here is 3 inches, a teacup and 3 times the National Weather Service's 1 inch severe criterion, reported on 2010-09-18 near Cumberland.
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 2026-03-30, around Marne. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Cass 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 21 separate hail days here since 2010 -- 1.2 a year over 17 years of record. They carry 25 reports in total: most hail days here are logged from a single spot. 4 of those 17 years produced none at all. The busiest single year was 2010, with 3 hail days. The last five years track the long-run rate, with 7 days since 2022.
4 of the 21 days reached 2 inches or more -- 19%, or about one hail day in 5, the last on 2024-04-30. Those big days do not follow the county's usual calendar: most of them fall in April, not June. 6 of the 21 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 Griswold -- 6 of the county's 21 hail days -- then Cumberland (4), Marne (4), Atlantic (2) and Lewis (2).
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Griswold | 2 | 1.75″ |
| 4 S Cumberland | 2 | 1.50″ |
| 3 S Griswold | 2 | 1.00″ |
| Lewis | 2 | 1.00″ |
| 7 S Cumberland | 1 | 3.00″ |
The season runs March through June: 17 of the 21 hail days on record fall in those 4 months (81%). June is the single busiest month, with 7 of them (33%). That peak closes the window: the season builds all the way to its worst month and then stops. Hail has also been reported in August and September, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| March | 3 |
| April | 5 |
| May | 2 |
| June | 7 |
| August | 2 |
| September | 2 |
That day put 1 report on the map, the biggest 1 inch near Marne. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-03-30 | 1.00″ | 1 |
| 2025-06-15 | 1.50″ | 1 |
| 2025-04-17 | 1.00″ | 1 |
| 2024-05-21 | 1.00″ | 1 |
| 2024-04-30 | 2.00″ | 1 |
| 2022-09-17 | 1.75″ | 1 |
| 2022-04-22 | 1.00″ | 1 |
| 2021-06-18 | 1.25″ | 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 3 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: Montgomery County (26 hail days), Adams County (20) and Adair County (28). Cass County sits in between.
Montgomery County · Adams County · Adair 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, Cass County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.