Jefferson County, Kansas Hail Map & History
Jefferson County was hit as recently as 2026-09-06, 8 days ago. Jefferson 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 2011-08-19 near Nortonville.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Kansas. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-09-06, around Winchester. 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.
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See call-center options ->How often it hails in Jefferson County
NOAA's Storm Prediction Center has logged 37 separate hail days here since 2010 -- 2.2 a year over 17 years of record. Those days carry 102 separate reports between them, two or three on a typical one. 4 of those 17 years produced none at all. The busiest single year was 2011, with 7 hail days. The last five years track the long-run rate, with 13 days since 2022.
7 of the 37 days reached 2 inches or more -- 19%, or about one hail day in 5, the last on 2024-04-30. Those big days do not follow the county's usual calendar: most of them fall in May, not April. 10 of the 37 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Kansas, see the Kansas hail map and history.
Hardest-hit places in Jefferson County
Reports cluster nearest Mclouth -- 11 of the county's 37 hail days -- then Ozawkie (9), Valley Falls (8), Oskaloosa (7) and Meriden (7). Beyond those, NOAA names Nortonville, Grantville, Williamstown, Perry and Winchester on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Nortonville | 5 | 1.75″ |
| Mclouth | 4 | 1.75″ |
| Valley Falls | 4 | 1.75″ |
| Williamstown | 2 | 2.00″ |
| 2 S Meriden | 2 | 1.75″ |
When it hails in Jefferson County
The season runs April through September: 33 of the 37 hail days on record fall in those 6 months (89%). April is the single busiest month, with 10 of them (27%). That peak opens the window: the season starts at its worst and eases off from there. Hail has also been reported in March, October and November, outside that window. January, February and December are the only months that have never produced a reported hail day.
| Month | Hail days |
|---|---|
| March | 1 |
| April | 10 |
| May | 5 |
| June | 8 |
| July | 1 |
| August | 4 |
| September | 5 |
| October | 2 |
| November | 1 |
Recent Jefferson County hail days
That day put 1 report on the map, the biggest 1 inch near Winchester. 3 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-09-06 | 1.00″ | 1 |
| 2026-08-14 | 1.25″ | 1 |
| 2026-04-17 | 1.00″ | 1 |
| 2025-04-23 | 1.00″ | 1 |
| 2024-10-24 | 1.00″ | 1 |
| 2024-04-30 | 2.00″ | 7 |
| 2024-04-17 | 1.00″ | 1 |
| 2024-03-13 | 1.50″ | 2 |
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 3 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: Leavenworth County (40 hail days), Douglas County (30) and Atchison County (24). Jefferson County sits in between.
Leavenworth County · Douglas County · Atchison County
Back to the Kansas hail map or the U.S. hail map.
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Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Jefferson County, Kansas only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.