Williams County, North Dakota Hail Map & History
Williams County was hit as recently as 2026-09-02, 12 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 2026-09-02, 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.
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See call-center options ->How often it hails in Williams County
NOAA's Storm Prediction Center has logged 50 separate hail days here since 2010 -- 2.9 a year over 17 years of record. Those days carry 113 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 12 days since 2022.
7 of the 50 days reached 2 inches or more -- 14%, 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 50 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of North Dakota, see the North Dakota hail map and history.
Hardest-hit places in Williams County
Reports cluster nearest Williston -- 20 of the county's 50 hail days -- then Epping (8), Trenton (7), Alamo (7) and Ray (7). 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 | 12 | 2.75″ |
| Epping | 3 | 2.50″ |
| Ray | 3 | 1.25″ |
| 3 N Williston | 3 | 1.00″ |
| 10 Nw Williston | 2 | 2.00″ |
When it hails in Williams County
The season runs June through August: 43 of the 50 hail days on record fall in those 3 months (86%). July is the single busiest month, with 21 of them (42%). 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 | 16 |
| July | 21 |
| August | 6 |
| September | 4 |
Recent Williams County hail days
That day put 1 report on the map, the biggest 1 inch near Williston. 3 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-09-02 | 1.00″ | 1 |
| 2026-06-09 | 1.00″ | 1 |
| 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 |
How to read the Williams 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 3 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, over the state line included: McKenzie County (45 hail days), Divide County (26), 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.
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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.