Delaware County, Iowa Hail Map & History
Delaware County was hit as recently as 2026-08-07, 39 days ago. Delaware County is hit in most years. The largest stone on record here is 4.5 inches, a softball and 4.5 times the National Weather Service's 1 inch severe criterion, reported on 2026-08-07 near Ryan.
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 Ryan. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Delaware 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 Delaware County
NOAA's Storm Prediction Center has logged 17 separate hail days here since 2010 -- 1.0 a year over 17 years of record. They carry 20 reports in total: most hail days here are logged from a single spot. 6 of those 17 years produced none at all. The busiest single year was 2026, with 3 hail days. The last five years have run hotter than the long-run rate: 7 days since 2022, against 0.8 a year before that.
Most hail here stays under 2 inches: only 1 of the 17 days on record passed it, 6%, the last on 2026-08-07. Those big days do not follow the county's usual calendar: most of them fall in August, not April. Golf-ball size is rarer still: 1.75 inches or more on 3 of the 17 days.
Across the whole of Iowa, see the Iowa hail map and history.
Hardest-hit places in Delaware County
Reports cluster nearest Hopkinton -- 5 of the county's 17 hail days -- then Ryan (3), Manchester (3) and Delhi (2).
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Ryan | 2 | 4.50″ |
| Hopkinton | 2 | 1.00″ |
| 3 Ne Manchester Airport | 1 | 1.75″ |
| Delhi | 1 | 1.75″ |
| 4 NNE Hopkinton | 1 | 1.25″ |
When it hails in Delaware County
The season runs April through July: 15 of the 17 hail days on record fall in those 4 months (88%). April is the single busiest month, with 7 of them (41%). That peak opens the window: the season starts at its worst and eases off from there. Hail has also been reported in August, outside that window. Reports span 5 of the 12 calendar months; the other 7 have never produced one.
| Month | Hail days |
|---|---|
| April | 7 |
| May | 2 |
| June | 4 |
| July | 2 |
| August | 2 |
Recent Delaware County hail days
That day put 1 report on the map, the biggest 4.5 inches near Ryan. 3 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-08-07 | 4.50″ | 1 |
| 2026-04-17 | 1.25″ | 1 |
| 2026-04-14 | 1.00″ | 2 |
| 2025-07-03 | 1.00″ | 2 |
| 2023-04-19 | 1.00″ | 1 |
| 2023-04-04 | 1.00″ | 1 |
| 2022-06-15 | 1.00″ | 1 |
| 2021-08-24 | 1.75″ | 1 |
How to read the Delaware 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 4.5 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: Buchanan County (21 hail days), Jones County (21) and Clayton County (23). Every one of them takes more hail than Delaware County.
Buchanan County · Jones County · Clayton 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, Delaware County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.