The most recent reported hail day was 2026-03-22, 131 days ago. Mercer County is hit in about half the years on record. 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 2017-07-10 near Mendon.
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 2026-03-22, around Mendon. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Mercer 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 13 separate hail days here since 2010 -- 0.8 a year over 17 years of record. They carry 19 reports in total: most hail days here are logged from a single spot. 9 of those 17 years produced none at all. One year dominates the record: 2019 alone produced 3 of the 13 days. The last five years have been quieter than the long run: 2 days since 2022, against 0.9 a year before that.
Most hail here stays under 2 inches: only 1 of the 13 days on record passed it, 8%, the last on 2017-07-10. They land in the same month as everything else, July. Golf-ball size is rarer still: 1.75 inches or more on 2 of the 13 days.
Across the whole of Ohio, see the Ohio hail map and history.
Reports cluster nearest Celina -- 5 of the county's 13 hail days -- then Maria Stein (3), Mendon (2) and Rockford (2).
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Maria Stein | 3 | 1.00″ |
| Mendon | 2 | 2.50″ |
| Celina | 2 | 1.25″ |
| N Mendon | 1 | 1.75″ |
| 1 Ne Celina | 1 | 1.50″ |
The season runs March through July: 12 of the 13 hail days on record fall in those 5 months (92%). July is the single busiest month, with 4 of them (31%). That peak closes the window: the season builds all the way to its worst month and then stops. Hail has also been reported in August, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| March | 2 |
| April | 1 |
| May | 3 |
| June | 2 |
| July | 4 |
| August | 1 |
That day put 2 reports on the map, the biggest 1.5 inches near Mendon. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-03-22 | 1.50″ | 2 |
| 2024-03-14 | 1.00″ | 2 |
| 2020-07-08 | 1.00″ | 1 |
| 2019-08-08 | 1.50″ | 1 |
| 2019-05-28 | 1.50″ | 2 |
| 2019-05-16 | 1.25″ | 1 |
| 2017-07-16 | 1.00″ | 1 |
| 2017-07-10 | 2.50″ | 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: Auglaize County (15 hail days), Allen County (13), Logan County (14), Wells County, Indiana (15) and Randolph County, Indiana (15). Mercer County sits in between.
Auglaize County · Allen County · Logan County · Wells County, Indiana · Randolph County, Indiana
Back to the Ohio hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Mercer County, Ohio only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.