Grayson County was hit as recently as 2026-05-09, 83 days ago. Grayson County is hit in most years, and usually several times over. The largest stone on record here is 3.5 inches and 3.5 times the National Weather Service's 1 inch severe criterion, reported on 2026-04-25 near Bells.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Texas. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-05-09, around Whitesboro. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Grayson 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 57 separate hail days here since 2010 -- 3.4 a year over 17 years of record. Those days carry 192 separate reports between them, better than three on a typical one. Exactly one year since 2010 passed with no reported hail day at all. The busiest single year was 2025, with 9 hail days. The last five years have run hotter than the long-run rate: 29 days since 2022, against 2.3 a year before that.
13 of the 57 days reached 2 inches or more -- 23%, or about one hail day in 4, the last on 2026-05-09. They land in the same month as everything else, May. 22 of the 57 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Texas, see the Texas hail map and history.
Reports cluster nearest Sherman -- 18 of the county's 57 hail days -- then Denison (13), Pottsboro (10), Whitesboro (10) and Southmayd (9). Beyond those, NOAA names Tom Bean, Van Alstyne, Bells, Sadler, Howe, Luella, Whitewright, Knollwood and Gunter on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Sherman | 7 | 2.75″ |
| Tom Bean | 6 | 1.75″ |
| Whitesboro | 5 | 2.00″ |
| Van Alstyne | 5 | 1.75″ |
| Gunter | 4 | 2.50″ |
The season runs February through June: 47 of the 57 hail days on record fall in those 5 months (82%). May is the single busiest month, with 15 of them (26%). That peak sits inside the window rather than at either end. Hail has also been reported in August, September, October and November, outside that window. January, July and December are the only months that have never produced a reported hail day.
| Month | Hail days |
|---|---|
| February | 3 |
| March | 11 |
| April | 12 |
| May | 15 |
| June | 6 |
| August | 2 |
| September | 4 |
| October | 1 |
| November | 3 |
That day put 4 reports on the map, the biggest 2 inches near Whitesboro. 3 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-05-09 | 2.00″ | 4 |
| 2026-04-25 | 3.50″ | 12 |
| 2026-04-15 | 1.00″ | 1 |
| 2025-09-23 | 2.00″ | 6 |
| 2025-09-21 | 2.50″ | 10 |
| 2025-06-08 | 1.25″ | 1 |
| 2025-06-07 | 1.00″ | 1 |
| 2025-05-29 | 1.75″ | 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 3.5 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: Fannin County (48 hail days), Cooke County (48), Collin County (74), Marshall County, Oklahoma (27) and Bryan County, Oklahoma (34). Grayson County sits in between.
Fannin County · Cooke County · Collin County · Marshall County, Oklahoma · Bryan County, Oklahoma
Back to the Texas hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Grayson County, Texas only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.