Marion County was hit as recently as 2026-06-11, 50 days ago. Marion 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 2015-06-20 near Harvey.
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 Hamilton. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Marion 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 30 separate hail days here since 2010 -- 1.8 a year over 17 years of record. Those days carry 83 separate reports between them, two or three on a typical one. 3 of those 17 years produced none at all. One year dominates the record: 2023 alone produced 6 of the 30 days. The last five years have run hotter than the long-run rate: 15 days since 2022, against 1.2 a year before that.
5 of the 30 days reached 2 inches or more -- 17%, or about one hail day in 6, the last on 2026-06-11. Those big days do not follow the county's usual calendar: most of them fall in June, not May. 8 of the 30 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 Knoxville -- 12 of the county's 30 hail days -- then Pella (12), Melcher-Dallas (5), Attica (5) and Pleasantville (5). That one town is named on 40% of them. Beyond those, NOAA names Harvey, Lake Red Rock and Bussey on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Knoxville | 8 | 1.75″ |
| Bussey | 4 | 1.75″ |
| Melcher-Dallas | 4 | 1.75″ |
| Pella | 3 | 2.50″ |
| Pleasantville | 3 | 1.75″ |
The season runs April through July: 26 of the 30 hail days on record fall in those 4 months (87%). May is the single busiest month, with 7 of them (23%). 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 7 of the 12 calendar months; the other 5 have never produced one.
| Month | Hail days |
|---|---|
| March | 1 |
| April | 6 |
| May | 7 |
| June | 7 |
| July | 6 |
| September | 2 |
| October | 1 |
That day put 10 reports on the map, the biggest 2 inches near Hamilton. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-06-11 | 2.00″ | 10 |
| 2026-04-17 | 1.00″ | 2 |
| 2025-05-19 | 1.00″ | 1 |
| 2024-10-03 | 1.75″ | 3 |
| 2024-07-30 | 1.25″ | 3 |
| 2024-06-25 | 1.00″ | 1 |
| 2024-05-21 | 2.00″ | 4 |
| 2024-05-19 | 1.00″ | 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 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: Mahaska County (15 hail days), Monroe County (15) and Jasper County (33). Marion County sits in between.
Mahaska County · Monroe County · Jasper 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, Marion County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.