The most recent reported hail day was 2025-07-20, 376 days ago. Sanborn County is hit in about half the years on record. The largest stone on record here is 1.75 inches, a golf ball and 1.8 times the National Weather Service's 1 inch severe criterion, reported on 2017-06-21 near Artesian.
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 2025-07-20, around Woonsocket. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Sanborn 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 17 separate hail days here since 2010 -- 1.0 a year over 17 years of record. They carry 21 reports in total: most hail days here are logged from a single spot. 8 of those 17 years produced none at all. One year dominates the record: 2017 alone produced 5 of the 17 days. The last five years have been quieter than the long run: 3 days since 2022, against 1.2 a year before that.
No stone of 2 inches or more has ever been reported in Sanborn County: all 17 hail days on record topped out below that. Golf-ball size is rarer still: 1.75 inches or more on 4 of the 17 days.
Across the whole of South Dakota, see the South Dakota hail map and history.
Reports cluster nearest Woonsocket -- 7 of the county's 17 hail days -- then Artesian (5), Alpena (2) and Letcher (2). That one town is named on 41% of them.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Woonsocket | 2 | 1.75″ |
| 7 Ne Woonsocket | 2 | 1.00″ |
| 3 Nne Forestburg | 1 | 1.75″ |
| 3 Wsw Artesian | 1 | 1.75″ |
| 8 Nne Artesian | 1 | 1.75″ |
The season runs May through August: 15 of the 17 hail days on record fall in those 4 months (88%). July is the single busiest month, with 6 of them (35%). That peak sits inside the window rather than at either end. Hail has also been reported in April and September, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| April | 1 |
| May | 4 |
| June | 2 |
| July | 6 |
| August | 3 |
| September | 1 |
That day put 2 reports on the map, the biggest 1.5 inches near Woonsocket. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2025-07-20 | 1.50″ | 2 |
| 2025-05-19 | 1.00″ | 1 |
| 2022-07-03 | 1.00″ | 1 |
| 2021-08-22 | 1.00″ | 1 |
| 2019-07-03 | 1.00″ | 1 |
| 2017-09-19 | 1.00″ | 1 |
| 2017-07-25 | 1.00″ | 2 |
| 2017-07-11 | 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 1.75 inches, which is the red band. Look up a street address with the hail history by address tool.
The nearest counties with a page of their own: Miner County (14 hail days), Davison County (19) and Jerauld County (19). Sanborn County sits in between.
Miner County · Davison County · Jerauld County
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, Sanborn County, South Dakota only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.