Harrison County was hit as recently as 2026-05-31, 61 days ago. Harrison County is hit in most years, often more than once. 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 2024-06-12 near Little Sioux.
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 2026-05-31, around Woodbine. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Harrison 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 35 separate hail days here since 2010 -- 2.1 a year over 17 years of record. Those days carry 72 separate reports between them, two or three on a typical one. 3 of those 17 years produced none at all. The busiest single year was 2014, with 6 hail days. The last five years track the long-run rate, with 10 days since 2022.
Most hail here stays under 2 inches: only 3 of the 35 days on record passed it, 9%, the last on 2024-06-12. They land in the same month as everything else, June. 10 of the 35 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 Missouri Valley -- 11 of the county's 35 hail days -- then Little Sioux (7), Woodbine (7), Logan (6) and Dunlap (5). Beyond those, NOAA names Magnolia, Persia, Pisgah, Mondamin and Modale on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Missouri Valley | 7 | 1.75″ |
| Woodbine | 6 | 1.25″ |
| Logan | 5 | 1.75″ |
| Dunlap | 4 | 1.75″ |
| 2 Nw Little Sioux | 3 | 2.00″ |
The season runs April through July: 29 of the 35 hail days on record fall in those 4 months (83%). June is the single busiest month, with 13 of them (37%). That peak sits inside the window rather than at either end. Hail has also been reported in March, August and September, outside that window. Reports span 7 of the 12 calendar months; the other 5 have never produced one.
| Month | Hail days |
|---|---|
| March | 2 |
| April | 6 |
| May | 6 |
| June | 13 |
| July | 4 |
| August | 1 |
| September | 3 |
That day put 1 report on the map, the biggest 1 inch near Woodbine. 3 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-05-31 | 1.00″ | 1 |
| 2026-04-23 | 1.50″ | 9 |
| 2026-04-15 | 1.75″ | 4 |
| 2025-09-22 | 1.00″ | 1 |
| 2024-06-25 | 1.50″ | 1 |
| 2024-06-12 | 3.00″ | 3 |
| 2023-09-23 | 1.00″ | 1 |
| 2023-07-16 | 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 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, over the state line included: Shelby County (25 hail days), Pottawattamie County (42), Monona County (26) and Washington County, Nebraska (30). Harrison County sits in between.
Shelby County · Pottawattamie County · Monona County · Washington County, Nebraska
Back to the Iowa hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Harrison County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.