Harper County was hit as recently as 2026-06-16, 45 days ago. Harper County has recorded hail in nearly every year on the archive. 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 2019-04-17 near Selman.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Oklahoma. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-06-16, around Laverne. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Harper 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 32 separate hail days here since 2010 -- 1.9 a year over 17 years of record. Those days carry 65 separate reports between them, two or three on a typical one. 2 of those 17 years produced none at all. The busiest single year was 2025, with 4 hail days. The last five years track the long-run rate, with 9 days since 2022.
Roof-killing hail is routine here: 8 of the 32 days reached 2 inches or more, 25% of them, the last on 2026-06-16. Those big days do not follow the county's usual calendar: most of them fall in April, not May. More than half of every hail day on record here -- 16 of 32 -- reached golf-ball size, 1.75 inches or bigger.
Across the whole of Oklahoma, see the Oklahoma hail map and history.
Reports cluster nearest Buffalo -- 12 of the county's 32 hail days -- then Selman (9), Laverne (9), Rosston (6) and May (4). Beyond those, NOAA names Fort Supply and Plainview on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Buffalo | 5 | 1.75″ |
| Laverne | 3 | 2.00″ |
| Selman | 2 | 3.00″ |
| Rosston | 2 | 2.75″ |
| 11 N Buffalo | 2 | 1.75″ |
The season runs April through August: 27 of the 32 hail days on record fall in those 5 months (84%). May is the single busiest month, with 10 of them (31%). That peak sits inside the window rather than at either end. Hail has also been reported in March, September and November, outside that window. Reports span 8 of the 12 calendar months; the other 4 have never produced one.
| Month | Hail days |
|---|---|
| March | 1 |
| April | 7 |
| May | 10 |
| June | 6 |
| July | 2 |
| August | 2 |
| September | 3 |
| November | 1 |
That day put 4 reports on the map, the biggest 2.75 inches near Laverne. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-06-16 | 2.75″ | 4 |
| 2026-03-03 | 1.00″ | 1 |
| 2025-09-17 | 1.75″ | 1 |
| 2025-09-08 | 2.50″ | 2 |
| 2025-05-18 | 2.75″ | 5 |
| 2025-04-24 | 2.50″ | 3 |
| 2023-08-13 | 1.00″ | 1 |
| 2022-05-14 | 2.50″ | 8 |
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.
The nearest counties with a page of their own, over the state line included: Woodward County (49 hail days), Ellis County (43), Woods County (27), Clark County, Kansas (49) and Comanche County, Kansas (48). Harper County sits in between.
Woodward County · Ellis County · Woods County · Clark County, Kansas · Comanche County, Kansas
Back to the Oklahoma hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Harper County, Oklahoma only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.