Grant County was hit as recently as 2026-07-19, 12 days ago. Grant County is hit in most years, and usually several times over. The largest stone on record here is 4.25 inches and 4.2 times the National Weather Service's 1 inch severe criterion, reported on 2014-07-05 near Heart Butte Dam.
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 2026-07-19, around Heart Butte Dam. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Grant 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 56 separate hail days here since 2010 -- 3.3 a year over 17 years of record. Those days carry 102 separate reports between them, two or three on a typical one. No year since 2010 has gone by without at least one. The busiest single year was 2018, with 9 hail days. The last five years have been quieter than the long run: 11 days since 2022, against 3.8 a year before that.
9 of the 56 days reached 2 inches or more -- 16%, or about one hail day in 6, the last on 2021-08-30. They land in the same month as everything else, July. 22 of the 56 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 Heart Butte Dam -- 14 of the county's 56 hail days -- then New Leipzig (13), Saint Gertrude (10), Elgin (8) and Carson (8). Beyond those, NOAA names Leith, Lark, Bentley and St. Gertrude on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Heart Butte Dam | 7 | 4.25″ |
| New Leipzig | 7 | 2.50″ |
| Elgin | 5 | 4.25″ |
| Carson | 5 | 1.25″ |
| 9 Sse Leith | 3 | 1.00″ |
The season runs June through August: 48 of the 56 hail days on record fall in those 3 months (86%). July is the single busiest month, with 28 of them (50%). That peak sits inside the window rather than at either end. Hail has also been reported in March, May and September, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| March | 1 |
| May | 6 |
| June | 12 |
| July | 28 |
| August | 8 |
| September | 1 |
That day put 1 report on the map, the biggest 1.5 inches near Heart Butte Dam. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-07-19 | 1.50″ | 1 |
| 2026-07-09 | 1.75″ | 1 |
| 2025-09-12 | 1.00″ | 1 |
| 2025-07-09 | 1.00″ | 1 |
| 2025-06-19 | 1.25″ | 3 |
| 2024-06-15 | 1.75″ | 2 |
| 2023-07-30 | 1.75″ | 3 |
| 2023-07-29 | 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 4.25 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: Morton County (64 hail days), Hettinger County (47) and Sioux County (31). Grant County sits in between.
Morton County · Hettinger County · Sioux County
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, Grant County, North Dakota only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.