The most recent reported hail day was 2025-08-16, 349 days ago. Washtenaw 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 2023-07-20 near Ypsilanti.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Michigan. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2025-08-16, around Pittsfield Township. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Washtenaw 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 24 separate hail days here since 2010 -- 1.4 a year over 17 years of record. Those days carry 64 separate reports between them, two or three on a typical one. 3 of those 17 years produced none at all. The busiest single year was 2023, with 3 hail days. The last five years track the long-run rate, with 5 days since 2022.
4 of the 24 days reached 2 inches or more -- 17%, or about one hail day in 6, the last on 2023-07-20. They land in the same month as everything else, July. 6 of the 24 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Michigan, see the Michigan hail map and history.
Reports cluster nearest Ann Arbor -- 10 of the county's 24 hail days -- then Ypsilanti (5), Dexter (5), Chelsea (5) and Manchester (5). That one town is named on 42% of them. Beyond those, NOAA names Pinckney, Whittaker, Milan and Whitmore Lake on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Ann Arbor | 3 | 1.50″ |
| 2 Ne Dexter | 2 | 1.75″ |
| 5 Nnw Chelsea | 2 | 1.50″ |
| 6 W Ann Arbor | 2 | 1.50″ |
| Dexter | 2 | 1.50″ |
The season runs March through August: 21 of the 24 hail days on record fall in those 6 months (88%). July is the single busiest month, with 9 of them (38%). That peak sits inside the window rather than at either end. Hail has also been reported in February and September, outside that window. Reports span 8 of the 12 calendar months; the other 4 have never produced one.
| Month | Hail days |
|---|---|
| February | 2 |
| March | 2 |
| April | 1 |
| May | 2 |
| June | 4 |
| July | 9 |
| August | 3 |
| September | 1 |
That day put 1 report on the map, the biggest 1 inch near Pittsfield Township. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2025-08-16 | 1.00″ | 1 |
| 2024-02-27 | 1.00″ | 1 |
| 2023-07-20 | 2.00″ | 3 |
| 2023-07-14 | 1.25″ | 3 |
| 2023-06-15 | 1.75″ | 9 |
| 2021-06-12 | 1.00″ | 2 |
| 2020-04-07 | 1.50″ | 4 |
| 2019-07-02 | 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: Livingston County (13 hail days), Wayne County (20) and Monroe County (15). Washtenaw County takes more hail than any of them.
Livingston County · Wayne County · Monroe County
Back to the Michigan hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Washtenaw County, Michigan only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.