The most recent reported hail day was 2026-04-17, 105 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 2026-04-17, around Valley Falls. 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 ->NOAA's Storm Prediction Center has logged 35 separate hail days here since 2010 -- 2.1 a year over 17 years of record. Those days carry 100 separate reports between them, two or three on a typical one. 4 of those 17 years produced none at all. One year dominates the record: 2011 alone produced 7 of the 35 days. The last five years track the long-run rate, with 11 days since 2022.
7 of the 35 days reached 2 inches or more -- 20%, 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 35 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Kansas, see the Kansas hail map and history.
Reports cluster nearest Mclouth -- 11 of the county's 35 hail days -- then Ozawkie (9), Valley Falls (8), Oskaloosa (7) and Nortonville (6). Beyond those, NOAA names Grantville, Meriden, 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″ |
| 3 S Meriden | 2 | 1.75″ |
The season runs April through September: 31 of the 35 hail days on record fall in those 6 months (89%). April is the single busiest month, with 10 of them (29%). 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 | 3 |
| September | 4 |
| October | 2 |
| November | 1 |
That day put 1 report on the map, the biggest 1 inch near Valley Falls. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 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 |
| 2023-09-16 | 2.50″ | 4 |
| 2023-07-04 | 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 3 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: Leavenworth County (39 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.
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.