Mahaska County was hit as recently as 2026-06-11, 50 days ago. Mahaska County is hit in about half the years on record. The largest stone on record here is 2 inches, a hen egg and twice the National Weather Service's 1 inch severe criterion, reported on 2023-05-07 near Rose Hill.
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 2026-06-11, around Oskaloosa. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Mahaska County addresses inside a hail swath above your size threshold into a door-knock list you can export, scoped to your approved markets.
Get free access Check an addressOur US-based call center calls the homeowners in this storm and books roof inspections straight onto your calendar. You work the storm; we fill the schedule. We dial -- you do not have to knock a single door.
See call-center options ->NOAA's Storm Prediction Center has logged 15 separate hail days here since 2010 -- 0.9 a year over 17 years of record. Those days carry 29 separate reports between them, two or three on a typical one. 9 of those 17 years produced none at all. One year dominates the record: 2023 alone produced 3 of the 15 days. The last five years have run hotter than the long-run rate: 6 days since 2022, against 0.8 a year before that.
3 of the 15 days reached 2 inches or more -- 20%, or about one hail day in 5, the last on 2023-05-07. Those big days do not follow the county's usual calendar: most of them fall in June, not April. More than half of every hail day on record here -- 8 of 15 -- reached golf-ball size, 1.75 inches or bigger.
Across the whole of Iowa, see the Iowa hail map and history.
Reports cluster nearest Oskaloosa -- 7 of the county's 15 hail days -- then New Sharon (6) and Eddyville (2). That one town is named on 47% of them.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| 1 N Oskaloosa | 3 | 1.00″ |
| Oskaloosa | 2 | 2.00″ |
| New Sharon | 2 | 1.25″ |
| 2 Nw Oskaloosa | 2 | 1.00″ |
| 1 W Rose Hill | 1 | 2.00″ |
The season runs April through July: 13 of the 15 hail days on record fall in those 4 months (87%). April is the single busiest month, with 5 of them (33%). That peak opens the window: the season starts at its worst and eases off from there. Hail has also been reported in February and August, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| February | 1 |
| April | 5 |
| May | 3 |
| June | 3 |
| July | 2 |
| August | 1 |
That day put 1 report on the map, the biggest 1 inch near Oskaloosa. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-06-11 | 1.00″ | 1 |
| 2026-04-17 | 1.00″ | 3 |
| 2024-05-21 | 1.75″ | 1 |
| 2023-07-28 | 1.75″ | 1 |
| 2023-07-17 | 1.00″ | 2 |
| 2023-05-07 | 2.00″ | 3 |
| 2017-04-15 | 1.00″ | 1 |
| 2017-04-09 | 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 2 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: Marion County (30 hail days), Poweshiek County (21) and Keokuk County (23). Every one of them takes more hail than Mahaska County.
Marion County · Poweshiek County · Keokuk 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, Mahaska County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.