98
Recorded events
3
Direct deaths
1
Direct injuries
$21.9M
Property damage
Flash Flood in Grayson County, Texas: 98 recorded events between 1996 and 2026. The strongest on record measured 0. That places the county #172 nationally and #34 statewide for this hazard.
Decade by decade
Flash Flood in Grayson County, Texas: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Grayson County is the 2000s, when 32 of the county's 98 recorded events were logged. Comparing decades is useful for spotting active periods, but the earliest years are thin because systematic reporting for this hazard began later.
Within the Grayson County archive, flash flood makes up 9.1% of all recorded severe weather across 7 hazard types. Nationally the county sits at #172 for this hazard and #34 within Texas, putting it in the 94.4 percentile of all U.S. counties.
Seasonality
Events by month
May is the peak month for flash flood in Grayson County with 22 recorded events, while Feb is the quietest. Seasonality here is a property of the archive as much as the climate: reports cluster where population and spotter networks are densest.
Significant events
Deadliest on record
| Date | Location | Scale | Deaths | Injuries | Damage |
|---|---|---|---|---|---|
| Jun 18, 2007 | COLLINSVILLE | 0 | 2 | 0 | $20.0M |
| Apr 29, 2009 | LAKE TEXHOMA EAST | 0 | 1 | 1 | $50K |
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Feb 14, 2026 | (F39)SHERMAN-DENISON | — | $0 |
| Apr 30, 2025 | LUELLA | 0 | $0 |
| Jul 23, 2024 | SHERMAN MUNI ARPT | 0 | $2K |
| Jul 23, 2024 | (F39)SHERMAN-DENISON | 0 | $1K |
| Jun 5, 2024 | SHERMAN MUNI ARPT | 0 | $0 |
| Jun 5, 2024 | SADLER | 0 | $0 |
| Jun 5, 2024 | COLLINSVILLE | 0 | $0 |
| Jun 2, 2024 | COLLINSVILLE | 0 | $0 |
| May 26, 2024 | VAN ALSTYNE | 0 | $0 |
| May 24, 2024 | DIXIE | 0 | $0 |
Other hazards here
More from Grayson County
- Hail 480
- Thunderstorm Wind 388
- Tornado 72
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Significant flooding occurred with cars and mobile homes moved by the force of the water. Numerous roads were closed across the county, including Highways 377 and 75, and more than 450 people were rescued from high water. One woman died in floodwaters as she drove on Texoma Parkway under the U.S. Highway 75 overpass. Another fatality occurred when a truck flooded at the intersection of FM 1417 and Highway 11. A bridge on Highway 11 south of Sherman suffered extensive damage.
Numerous roads throughout the county were closed due to high water, especially in the southwestern portions of the county. Water rescues were conducted in the cities of Sherman and Gunter. One house was flooded in the city of Denison.
Highway 69 east of Denison was flooded and closed, as was Highway 75 north of town. A few homes in Denison were flooded. Several bridges were washed out in Sherman including bridges on Mayes Road and Ida Road. An automotive shop in Denison had water damage to computers, furniture, and cars and expected damages to total around $250,000.
Quick answers
Frequently asked
How many flash flood events are on record in Grayson County, Texas?
98 flash flood events are recorded in Grayson County between 1996 and 2026, causing 3 direct deaths.
What is the strongest flash flood recorded in Grayson County?
The strongest flash flood on record in Grayson County measured 0.
Where does the flash flood data for Grayson County come from?
All events come from the NOAA/NCEI Storm Events Database, the federal public-domain archive of severe weather reports. Dates are UTC, damage is as reported and not inflation-adjusted, and the most recent entries may still be revised.
Cite this page
“Flash Flood in Grayson County, Texas.” Severe Weather History. severeweatherhistory.com/county/texas/grayson-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.