The most recent reported hail day was 2026-03-22, 131 days ago. Knox 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 2010-05-21 near Vincennes.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Indiana. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-03-22, around Bicknell. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Knox 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 23 separate hail days here since 2010 -- 1.4 a year over 17 years of record. Those days carry 42 separate reports between them, two or three on a typical one. 3 of those 17 years produced none at all. One year dominates the record: 2012 alone produced 5 of the 23 days. The last five years track the long-run rate, with 7 days since 2022.
3 of the 23 days reached 2 inches or more -- 13%, or about one hail day in 8, the last on 2026-03-22. Those big days do not follow the county's usual calendar: most of them fall in May, not April. 8 of the 23 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Indiana, see the Indiana hail map and history.
Reports cluster nearest Vincennes -- 6 of the county's 23 hail days -- then Oaktown (5), Freelandville (4), Decker (4) and Bicknell (3). Beyond those, NOAA names Bruceville and Monroe City on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Oaktown | 4 | 1.50″ |
| Vincennes | 3 | 1.75″ |
| Freelandville | 3 | 1.25″ |
| Bicknell | 2 | 2.00″ |
| 4 E Vincennes | 2 | 1.00″ |
The season runs February through June: 19 of the 23 hail days on record fall in those 5 months (83%). April is the single busiest month, with 6 of them (26%). That peak sits inside the window rather than at either end. Hail has also been reported in July, August, October and November, outside that window. January, September and December are the only months that have never produced a reported hail day.
| Month | Hail days |
|---|---|
| February | 1 |
| March | 5 |
| April | 6 |
| May | 5 |
| June | 2 |
| July | 1 |
| August | 1 |
| October | 1 |
| November | 1 |
That day put 3 reports on the map, the biggest 2 inches near Bicknell. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-03-22 | 2.00″ | 3 |
| 2026-03-04 | 1.25″ | 1 |
| 2024-03-30 | 1.00″ | 2 |
| 2024-02-27 | 1.00″ | 1 |
| 2023-08-06 | 1.00″ | 1 |
| 2023-06-28 | 1.75″ | 1 |
| 2022-05-19 | 2.00″ | 4 |
| 2020-04-08 | 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 2.5 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, over the state line included: Daviess County (15 hail days), Gibson County (20), Dubois County (19) and Lawrence County, Illinois (15). Knox County takes more hail than any of them.
Daviess County · Gibson County · Dubois County · Lawrence County, Illinois
Back to the Indiana hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Knox County, Indiana only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.