Gregory County was hit as recently as 2026-05-17, 75 days ago. Gregory County is hit in most years, often more than once. The largest stone on record here is 2.75 inches, a baseball and 2.8 times the National Weather Service's 1 inch severe criterion, reported on 2024-08-25 near Gregory.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in South Dakota. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-05-17, around Burke. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Gregory 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 36 separate hail days here since 2010 -- 2.1 a year over 17 years of record. They carry 58 reports in total: most hail days here are logged from a single spot. 3 of those 17 years produced none at all. The busiest single year was 2010, with 6 hail days. The last five years track the long-run rate, with 9 days since 2022.
8 of the 36 days reached 2 inches or more -- 22%, or about one hail day in 4, the last on 2024-08-25. They land in the same month as everything else, June. 12 of the 36 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of South Dakota, see the South Dakota hail map and history.
Reports cluster nearest Burke -- 12 of the county's 36 hail days -- then Herrick (9), Gregory (8), Dixon (7) and Pickstown (4). Beyond those, NOAA names Bonesteel, Fairfax and Dallas on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Burke | 5 | 1.75″ |
| Bonesteel | 3 | 1.00″ |
| 8 SW Herrick | 2 | 1.25″ |
| 12 E Dixon | 1 | 2.75″ |
| 5 SSE Gregory | 1 | 2.75″ |
The season runs May through August: 32 of the 36 hail days on record fall in those 4 months (89%). June is the single busiest month, with 15 of them (42%). That peak sits inside the window rather than at either end. Hail has also been reported in March 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 | 5 |
| June | 15 |
| July | 5 |
| August | 7 |
| September | 3 |
That day put 1 report on the map, the biggest 1.25 inches near Burke. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-05-17 | 1.25″ | 1 |
| 2025-08-03 | 1.00″ | 1 |
| 2025-07-28 | 1.75″ | 1 |
| 2025-07-15 | 1.25″ | 1 |
| 2025-06-19 | 1.00″ | 1 |
| 2024-08-25 | 2.75″ | 5 |
| 2024-08-17 | 1.00″ | 2 |
| 2024-07-31 | 2.00″ | 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 2.75 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: Charles Mix County (48 hail days), Tripp County (47), Brule County (34), Boyd County, Nebraska (24) and Keya Paha County, Nebraska (35). Gregory County sits in between.
Charles Mix County · Tripp County · Brule County · Boyd County, Nebraska · Keya Paha County, Nebraska
Back to the South Dakota hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Gregory County, South Dakota only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.