Yankton County was hit as recently as 2026-06-29, 32 days ago. Yankton 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 2017-06-29 near Yankton.
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 2026-06-29, around Yankton. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Yankton 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 37 separate hail days here since 2010 -- 2.2 a year over 17 years of record. They carry 58 reports in total: most hail days here are logged from a single spot. 5 of those 17 years produced none at all. The busiest single year was 2023, with 6 hail days. The last five years have run hotter than the long-run rate: 18 days since 2022, against 1.6 a year before that.
Most hail here stays under 2 inches: only 1 of the 37 days on record passed it, 3%, the last on 2017-06-29. They land in the same month as everything else, June. Golf-ball size is rarer still: 1.75 inches or more on 8 of the 37 days.
Across the whole of South Dakota, see the South Dakota hail map and history.
Reports cluster nearest Yankton -- 18 of the county's 37 hail days -- then Lesterville (7), Utica (6), Mission Hill (5) and Mayfield (4). That one town is named on 49% of them. Beyond those, NOAA names Gayville, Volin and Tabor on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Yankton | 4 | 1.75″ |
| 3 Wsw Yankton | 2 | 2.75″ |
| Lesterville | 2 | 1.75″ |
| 5 Wsw Yankton | 2 | 1.50″ |
| Gayville | 2 | 1.50″ |
The season runs May through August: 31 of the 37 hail days on record fall in those 4 months (84%). June is the single busiest month, with 15 of them (41%). 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 | 3 |
| May | 3 |
| June | 15 |
| July | 6 |
| August | 7 |
| September | 3 |
That day put 2 reports on the map, the biggest 1 inch near Yankton. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-06-29 | 1.00″ | 2 |
| 2026-05-24 | 1.50″ | 2 |
| 2025-07-07 | 1.75″ | 1 |
| 2025-06-28 | 1.00″ | 1 |
| 2025-06-27 | 1.00″ | 1 |
| 2025-06-16 | 1.00″ | 2 |
| 2025-04-17 | 1.00″ | 1 |
| 2023-08-10 | 1.75″ | 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 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: Clay County (25 hail days), Bon Homme County (35), Turner County (26) and Cedar County, Nebraska (32). Yankton County takes more hail than any of them.
Clay County · Bon Homme County · Turner County · Cedar 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, Yankton County, South Dakota only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.