Washington County, Iowa Hail Map & History
Washington County was hit as recently as 2026-08-07, 38 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 2026-08-07, around Brighton. 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.
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See call-center options ->How often it hails in Washington County
NOAA's Storm Prediction Center has logged 25 separate hail days here since 2010 -- 1.5 a year over 17 years of record. They carry 42 reports in total: most hail days here are logged from a single spot. 5 of those 17 years produced none at all. One year dominates the record: 2026 alone produced 5 of the 25 days. The last five years track the long-run rate, with 9 days since 2022.
Most hail here stays under 2 inches: only 2 of the 25 days on record passed it, 8%, the last on 2026-04-14. They land in the same month as everything else, April. 7 of the 25 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Iowa, see the Iowa hail map and history.
Hardest-hit places in Washington County
Reports cluster nearest Riverside -- 8 of the county's 25 hail days -- then Washington (7), Kalona (4), Brighton (2) and Pleasant Plain (2). Beyond those, NOAA names Wellman and Crawfordsville on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Riverside | 6 | 1.00″ |
| Washington | 3 | 1.00″ |
| Brighton | 2 | 1.75″ |
| 3 S Crawfordsville | 2 | 1.50″ |
| Kalona | 2 | 1.00″ |
When it hails in Washington County
The season runs April through July: 22 of the 25 hail days on record fall in those 4 months (88%). April is the single busiest month, with 9 of them (36%). 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 | 2 |
Recent Washington County hail days
That day put 3 reports on the map, the biggest 1.75 inches near Brighton. 5 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-08-07 | 1.75″ | 3 |
| 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 |
How to read the Washington County map
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.
Nearby counties
The nearest counties with a page of their own: Johnson County (33 hail days), Keokuk County (24) and Henry County (21). Washington County sits in between.
Johnson County · Keokuk County · Henry County
Back to the Iowa hail map or the U.S. hail map.
FAQ
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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.