Jefferson County, Iowa Hail Map & History
Jefferson County was hit as recently as 2026-08-07, 38 days ago. Jefferson County is hit in about half the years on record. The largest stone on record here is 2 inches, a hen egg and twice the National Weather Service's 1 inch severe criterion, reported on 2026-04-14 near Packwood.
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 Packwood. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Jefferson 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 ->How often it hails in Jefferson County
NOAA's Storm Prediction Center has logged 18 separate hail days here since 2010 -- 1.1 a year over 17 years of record. They carry 32 reports in total: most hail days here are logged from a single spot. 7 of those 17 years produced none at all. One year dominates the record: 2013 alone produced 4 of the 18 days. The last five years track the long-run rate, with 5 days since 2022.
Most hail here stays under 2 inches: only 1 of the 18 days on record passed it, 6%, the last on 2026-04-14. Those big days do not follow the county's usual calendar: most of them fall in April, not May. 6 of the 18 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 Jefferson County
Reports cluster nearest Fairfield -- 7 of the county's 18 hail days -- then Batavia (3), Ese Batavia (3), Packwood (2) and Fairfield Municip (2). Beyond those, NOAA names Libertyville on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| 5 Ne Fairfield | 3 | 1.00″ |
| Ese Batavia | 3 | 1.00″ |
| Packwood | 2 | 2.00″ |
| Batavia | 2 | 1.75″ |
| Fairfield | 2 | 1.75″ |
When it hails in Jefferson County
The season runs April through September: 17 of the 18 hail days on record fall in those 6 months (94%). May is the single busiest month, with 6 of them (33%). That peak sits inside the window rather than at either end. Hail has also been reported in March, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| March | 1 |
| April | 4 |
| May | 6 |
| June | 2 |
| August | 2 |
| September | 3 |
Recent Jefferson County hail days
That day put 2 reports on the map, the biggest 1.75 inches near Packwood. 3 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-08-07 | 1.75″ | 2 |
| 2026-04-14 | 2.00″ | 2 |
| 2026-03-10 | 1.50″ | 3 |
| 2023-05-07 | 1.75″ | 1 |
| 2023-05-06 | 1.25″ | 2 |
| 2021-06-22 | 1.00″ | 1 |
| 2020-04-08 | 1.00″ | 1 |
| 2017-05-17 | 1.75″ | 1 |
How to read the Jefferson 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 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: Van Buren County (29 hail days), Keokuk County (24) and Wapello County (18). Jefferson County sits in between.
Van Buren County · Keokuk County · Wapello County
Back to the Iowa hail map or the U.S. hail map.
FAQ
How often does it hail in Jefferson County, Iowa?
When is hail season in Jefferson County?
How big does hail get in Jefferson County?
When was the last hail in Jefferson County?
Is the Jefferson County hail map free?
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Jefferson County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.