Washtenaw County, Michigan Hail Map & History
Washtenaw County was hit as recently as 2026-07-27, 49 days ago. Washtenaw County has recorded hail in nearly every year on the archive. 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 2026-07-27, around Manchester. 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 ->How often it hails in Washtenaw County
NOAA's Storm Prediction Center has logged 25 separate hail days here since 2010 -- 1.5 a year over 17 years of record. Those days carry 65 separate reports between them, two or three on a typical one. 2 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 6 days since 2022.
4 of the 25 days reached 2 inches or more -- 16%, or about one hail day in 6, the last on 2023-07-20. They land in the same month as everything else, July. Golf-ball size is rarer still: 1.75 inches or more on 6 of the 25 days.
Across the whole of Michigan, see the Michigan hail map and history.
Hardest-hit places in Washtenaw County
Reports cluster nearest Ann Arbor -- 10 of the county's 25 hail days -- then Manchester (6), Ypsilanti (5), Dexter (5) and Chelsea (5). That one town is named on 40% 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″ |
When it hails in Washtenaw County
The season runs April through August: 20 of the 25 hail days on record fall in those 5 months (80%). July is the single busiest month, with 10 of them (40%). That peak sits inside the window rather than at either end. Hail has also been reported in February, March 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 | 10 |
| August | 3 |
| September | 1 |
Recent Washtenaw County hail days
That day put 1 report on the map, the biggest 1 inch near Manchester. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-07-27 | 1.00″ | 1 |
| 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 |
How to read the Washtenaw County map
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.
Nearby counties
The nearest counties with a page of their own: Livingston County (13 hail days), Wayne County (20) and Lenawee County (13). Washtenaw County takes more hail than any of them.
Livingston County · Wayne County · Lenawee County
Back to the Michigan hail map or the U.S. hail map.
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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.