The most recent reported hail day was 2026-03-22, 131 days ago. Union County is hit in most years. The largest stone on record here is 2 inches, a hen egg and twice the National Weather Service's 1 inch severe criterion, reported on 2020-06-04 near Milford Center.
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 Unionville Center. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Union 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 30 reports in total: most hail days here are logged from a single spot. 5 of those 17 years produced none at all. The busiest single year was 2014, with 3 hail days. The last five years have been quieter than the long run: 3 days since 2022, against 1.2 a year before that.
2 of the 17 days reached 2 inches or more -- 12%, or about one hail day in 8, the last on 2020-06-04. Those big days do not follow the county's usual calendar: most of them fall in June, not March. 6 of the 17 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Ohio, see the Ohio hail map and history.
Reports cluster nearest Marysville -- 9 of the county's 17 hail days -- then Plain City (5), Milford Center (2), Dublin (2) and Richwood (2). That one town is named on 53% of them.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Marysville | 6 | 2.00″ |
| Plain City | 4 | 1.75″ |
| Milford Center | 2 | 1.50″ |
| 1 Se Milford Center | 1 | 2.00″ |
| 5 W Dublin | 1 | 1.75″ |
The season runs March through August: 15 of the 17 hail days on record fall in those 6 months (88%). March is the single busiest month, with 4 of them (24%). That peak opens the window: the season starts at its worst and eases off from there. Hail has also been reported in September, outside that window. Reports span 7 of the 12 calendar months; the other 5 have never produced one.
| Month | Hail days |
|---|---|
| March | 4 |
| April | 1 |
| May | 4 |
| June | 3 |
| July | 1 |
| August | 2 |
| September | 2 |
That day put 2 reports on the map, the biggest 1.5 inches near Unionville Center. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-03-22 | 1.50″ | 2 |
| 2024-03-14 | 1.00″ | 1 |
| 2023-04-21 | 1.00″ | 1 |
| 2020-06-04 | 2.00″ | 4 |
| 2020-03-28 | 1.00″ | 1 |
| 2019-09-01 | 1.50″ | 4 |
| 2018-05-21 | 1.00″ | 2 |
| 2016-03-14 | 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 2 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: Delaware County (16 hail days), Franklin County (33) and Logan County (14). Union County sits in between.
Delaware County · Franklin County · Logan 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, Union County, Ohio only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.