Harper County, Oklahoma Hail Map & History
Harper County was hit as recently as 2026-10-13, 17 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.
Hail size, inches
- 0.25 in, pea
- 0.75 in, penny
- 1 in, quarter
- 1.25 in, half dollar
- 1.5 in, ping pong ball
- 1.75 in, golf ball
- 2 in, hen egg
- 2.5 in, tennis ball
- 3 in and up, teacup
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 2026-10-13, around Fort Supply. 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 ->How often it hails in Harper County
NOAA's Storm Prediction Center has logged 33 separate hail days here since 2010 -- 1.9 a year over 17 years of record. Those days carry 66 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 10 days since 2022.
8 of the 33 days reached 2 inches or more -- 24%, or about one hail day in 4, 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. 16 of the 33 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Oklahoma, see the Oklahoma hail map and history.
Hardest-hit places in Harper County
Reports cluster nearest Buffalo -- 12 of the county's 33 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″ |
When it hails in Harper County
The season runs April through August: 27 of the 33 hail days on record fall in those 5 months (82%). May is the single busiest month, with 10 of them (30%). That peak sits inside the window rather than at either end. Hail has also been reported in March, September, October and November, outside that window. January, February and December are the only months that have never produced a reported hail day.
| Month | Hail days |
|---|---|
| March | 1 |
| April | 7 |
| May | 10 |
| June | 6 |
| July | 2 |
| August | 2 |
| September | 3 |
| October | 1 |
| November | 1 |
Recent Harper County hail days
That day put 1 report on the map, the biggest 1 inch near Fort Supply. 3 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-10-13 | 1.00″ | 1 |
| 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 |
How to read the Harper County map
The colored swath is NOAA's MRMS radar estimate of the largest hail per ~1 km cell; the dots are SPC ground reports. Deep violet is about an inch, the violet grows lighter as the hail grows, and pale lilac to near-white is 2″ and up (hail size vs roof damage). On this county's worst day the reports reached 3 inches, which is the pale lilac band. Look up a street address with the hail history by address tool.
Nearby counties
The nearest counties with a page of their own, over the state line included: Woodward County (50 hail days), Ellis County (44), Woods County (27), Clark County, Kansas (50) and Comanche County, Kansas (50). 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.
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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.