Williams County was hit as recently as 2026-06-07, 54 days ago. Williams County is hit in most years, and usually several times over. The largest stone on record here is 3 inches, a teacup and 3 times the National Weather Service's 1 inch severe criterion, reported on 2022-07-18 near Williston.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in North Dakota. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-06-07, around Williston. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Williams County addresses inside a hail swath above your size threshold into a door-knock list you can export, scoped to your approved markets.
Get free access Check an addressOur US-based call center calls the homeowners in this storm and books roof inspections straight onto your calendar. You work the storm; we fill the schedule. We dial -- you do not have to knock a single door.
See call-center options ->NOAA's Storm Prediction Center has logged 48 separate hail days here since 2010 -- 2.8 a year over 17 years of record. Those days carry 111 separate reports between them, two or three on a typical one. Exactly one year since 2010 passed with no reported hail day at all. The busiest single year was 2012, with 7 hail days. The last five years track the long-run rate, with 10 days since 2022.
7 of the 48 days reached 2 inches or more -- 15%, or about one hail day in 7, the last on 2022-07-18. They land in the same month as everything else, July. 16 of the 48 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of North Dakota, see the North Dakota hail map and history.
Reports cluster nearest Williston -- 19 of the county's 48 hail days -- then Epping (8), Trenton (7), Ray (7) and Alamo (6). That one town is named on 40% of them. Beyond those, NOAA names Grenora, Tioga, Bonetrail, Spring Brook, Mcgregor, Blacktail Lake, Corinth and Zahl on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Williston | 11 | 2.75″ |
| Epping | 3 | 2.50″ |
| Ray | 3 | 1.25″ |
| 3 N Williston | 3 | 1.00″ |
| 10 Nw Williston | 2 | 2.00″ |
The season runs June through August: 42 of the 48 hail days on record fall in those 3 months (88%). July is the single busiest month, with 21 of them (44%). That peak sits inside the window rather than at either end. Hail has also been reported in May and September, outside that window. Reports span 5 of the 12 calendar months; the other 7 have never produced one.
| Month | Hail days |
|---|---|
| May | 3 |
| June | 15 |
| July | 21 |
| August | 6 |
| September | 3 |
That day put 1 report on the map, the biggest 1.75 inches near Williston. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-06-07 | 1.75″ | 1 |
| 2025-08-07 | 1.00″ | 2 |
| 2025-07-25 | 1.50″ | 2 |
| 2025-06-18 | 1.00″ | 2 |
| 2024-07-14 | 1.50″ | 1 |
| 2024-07-12 | 1.00″ | 1 |
| 2024-06-14 | 1.50″ | 1 |
| 2023-08-01 | 1.50″ | 2 |
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 3 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: McKenzie County (44 hail days), Divide County (25), Mountrail County (46) and Richland County, Montana (40). Williams County takes more hail than any of them.
McKenzie County · Divide County · Mountrail County · Richland County, Montana
Back to the North Dakota hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Williams County, North Dakota only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.