The most recent reported hail day was 2026-03-26, 127 days ago. Knox County is hit in about half the years on record. The largest stone on record here is 1.75 inches, a golf ball and 1.8 times the National Weather Service's 1 inch severe criterion, reported on 2012-08-09 near Gambier.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Ohio. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-03-26, around Butler. 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 17 separate hail days here since 2010 -- 1.0 a year over 17 years of record. They carry 23 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: 2012 alone produced 4 of the 17 days. The last five years track the long-run rate, with 4 days since 2022.
No stone of 2 inches or more has ever been reported in Knox County: all 17 hail days on record topped out below that. Golf-ball size is rarer still: 1.75 inches or more on 2 of the 17 days.
Across the whole of Ohio, see the Ohio hail map and history.
Reports cluster nearest Mount Vernon -- 7 of the county's 17 hail days -- then Gambier (4), Butler (2), Fredericktown (2) and Danville (2). That one town is named on 41% of them.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Mount Vernon | 5 | 1.25″ |
| Gambier | 3 | 1.75″ |
| 3 S Butler | 2 | 1.25″ |
| Centerburg | 1 | 1.75″ |
| 3 Wsw Martinsburg | 1 | 1.25″ |
The season runs March through June: 14 of the 17 hail days on record fall in those 4 months (82%). March is the single busiest month, with 6 of them (35%). That peak opens the window: the season starts at its worst and eases off from there. Hail has also been reported in July and August, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| March | 6 |
| April | 2 |
| May | 4 |
| June | 2 |
| July | 1 |
| August | 2 |
That day put 1 report on the map, the biggest 1 inch near Butler. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-03-26 | 1.00″ | 1 |
| 2026-03-22 | 1.00″ | 3 |
| 2025-05-02 | 1.25″ | 1 |
| 2024-03-30 | 1.00″ | 1 |
| 2019-06-01 | 1.00″ | 1 |
| 2017-08-19 | 1.00″ | 1 |
| 2014-05-28 | 1.00″ | 1 |
| 2014-05-14 | 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 1.75 inches, which is the red band. Look up a street address with the hail history by address tool.
The nearest counties with a page of their own: Morrow County (16 hail days), Licking County (20) and Richland County (22). Knox County sits in between.
Morrow County · Licking County · Richland County
Back to the Ohio hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Knox County, Ohio only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.