The most recent reported hail day was 2026-04-15, 107 days ago. Washington County is hit in most years. The largest stone on record here is 2.5 inches, a tennis ball and 2.5 times the National Weather Service's 1 inch severe criterion, reported on 2026-04-02 near Kalona.
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 2026-04-15, around Riverside. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Washington 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 24 separate hail days here since 2010 -- 1.4 a year over 17 years of record. They carry 39 reports in total: most hail days here are logged from a single spot. 5 of those 17 years produced none at all. The busiest single year was 2026, with 4 hail days. The last five years track the long-run rate, with 8 days since 2022.
Most hail here stays under 2 inches: only 2 of the 24 days on record passed it, 8%, the last on 2026-04-14. They land in the same month as everything else, April. 6 of the 24 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 Riverside -- 8 of the county's 24 hail days -- then Washington (7), Kalona (4), Wellman (2) and Crawfordsville (2).
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Riverside | 6 | 1.00″ |
| Washington | 3 | 1.00″ |
| 3 S Crawfordsville | 2 | 1.50″ |
| Kalona | 2 | 1.00″ |
| 1 NNW Kalona | 1 | 2.50″ |
The season runs April through July: 22 of the 24 hail days on record fall in those 4 months (92%). April is the single busiest month, with 9 of them (38%). That peak opens the window: the season starts at its worst and eases off from there. Hail has also been reported in March and August, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| March | 1 |
| April | 9 |
| May | 7 |
| June | 3 |
| July | 3 |
| August | 1 |
That day put 1 report on the map, the biggest 1 inch near Riverside. 4 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-04-15 | 1.00″ | 1 |
| 2026-04-14 | 2.00″ | 4 |
| 2026-04-02 | 2.50″ | 2 |
| 2026-03-31 | 1.75″ | 1 |
| 2024-04-16 | 1.00″ | 2 |
| 2023-05-07 | 1.00″ | 4 |
| 2023-05-06 | 1.00″ | 2 |
| 2022-07-10 | 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 2.5 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: Johnson County (33 hail days), Keokuk County (23) and Henry County (20). Washington County sits in between.
Johnson County · Keokuk County · Henry 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, Washington County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.