Grayson County, Texas severe weather history spans 1,075 recorded events between 1952 and 2026. The dominant hazard is hail, accounting for 44.7% of all recorded events. It ranks #115 nationally and #15 in Texas.
1,075
Recorded events
10
Direct deaths
87
Direct injuries
$67.3M
Property damage
The record
What the Grayson County, Texas severe weather history record shows
Across the archive, Grayson County, Texas severe weather history averages 14.5 recorded events a year. The busiest stretch on record is the 2010s, with 246 events logged in that decade alone. Roughly 175 events fall before 1990 and 900 from 1990 onward — a gap that reflects the expansion of NOAA reporting practice as much as the weather itself.
The deadliest hazard in the Grayson County, Texas record is flash flood, responsible for 3 direct deaths. The costliest is hail, with $31.4M in reported property damage. In total, 7 distinct hazard types appear in this county archive, each listed with its own dated record below.
By hazard type
Every hazard type recorded in Grayson County
| Hazard | Events | Deaths | Damage | Max | Span |
|---|---|---|---|---|---|
| Hail | 480 | 0 | $31.4M | 4.5 | 1955–2026 |
| Thunderstorm Wind | 388 | 1 | $4.1M | 90 | 1957–2026 |
| Flash Flood | 98 | 3 | $21.9M | 0 | 1996–2026 |
| Tornado | 72 | 3 | $7.1M | F3 | 1952–2025 |
| Flood | 20 | 2 | $2.3M | 0 | 2009–2025 |
| Lightning | 15 | 1 | $450K | 0 | 1996–2025 |
| Heavy Rain | 2 | 0 | $0 | 0 | 2001–2011 |
Decade by decade
Grayson County, Texas severe weather history by decade
Reporting practice changed over time — early decades are undercounted, not calmer.
Tornado tracks
Paths crossing this county
72 mapped tornado paths intersect this county: 67 touched down inside it and 5 crossed in from a neighbouring county. This comes from path geometry, not county-tagged reports.
| Date | Scale | Deaths | Injuries | Path length | Origin |
|---|---|---|---|---|---|
| 2006-05-09 | EF3 | 3 | 10 | 9.3 mi | Crossed in |
| 1955-04-06 | EF3 | 1 | 27 | 30.2 mi | Touched down here |
| 1974-05-14 | EF3 | 0 | 0 | 2.0 mi | Touched down here |
| 1973-03-10 | EF3 | 0 | 3 | 6.8 mi | Touched down here |
| 1971-03-12 | EF3 | 0 | 4 | 41.6 mi | Crossed in |
| 1971-03-12 | EF3 | 0 | 0 | 5.2 mi | Crossed in |
| 1971-03-12 | EF3 | 0 | 0 | 5.1 mi | Touched down here |
| 1971-03-12 | EF3 | 0 | 0 | 5.1 mi | Touched down here |
| 1957-04-18 | EF3 | 0 | 0 | 1.0 mi | Touched down here |
| 1957-04-02 | EF3 | 0 | 4 | 10.7 mi | Crossed in |
Significant events
Deadliest events on record in Grayson County
| Date | Type | Location | Deaths | Injuries | Damage |
|---|---|---|---|---|---|
| Dec 24, 2024 | Flood | SHERMAN MUNI ARPT | 2 | 0 | $50K |
| Jun 18, 2007 | Flash Flood | COLLINSVILLE | 2 | 0 | $20.0M |
| Apr 6, 1955 | Tornado | 1 | 27 | $2.5M | |
| Mar 21, 2022 | Tornado | CEDAR MILLS | 1 | 11 | $0 |
| Jun 27, 2024 | Thunderstorm Wind | CEDAR MILLS | 1 | 7 | $0 |
| May 10, 2006 | Tornado | PILOT GROVE | 1 | 4 | $500K |
| Jun 8, 2025 | Lightning | GUNTER | 1 | 1 | $0 |
| Apr 29, 2009 | Flash Flood | LAKE TEXHOMA EAST | 1 | 1 | $50K |
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.
The tornado first touched down in a field near Thousand Oak Trails. It then moved through the Sherwood Oaks community, producing extensive and widespread damage to trees and homes. Multiple manufactured homes were flipped, many trees were snapped in half, and one home was moved off its foundation. The tornado then crossed Lake Texoma and moved into Marshall County Oklahoma. A total of 105 structures were damaged, 53 destroyed, and 27 sustained major damage. Maximum estimated winds in Grayson County were 130 mph. One fatality occurred in a mobile home.
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.
Context
Risk, population and federal disasters
Relatively Low
FEMA NRI risk rating
143,337
Population (ACS)
$248K
Median home value
21
Federal declarations
| Declared | Incident | Title | Type |
|---|---|---|---|
| Feb 19, 2021 | Severe Ice Storm | SEVERE WINTER STORMS | DR |
| Feb 14, 2021 | Severe Ice Storm | SEVERE WINTER STORM | EM |
| Mar 25, 2020 | Biological | COVID-19 PANDEMIC | DR |
| Mar 13, 2020 | Biological | COVID-19 | EM |
| May 29, 2015 | Severe Storm | SEVERE STORMS, TORNADOES, STRAIGHT-LINE WINDS AND FLOODING | DR |
| Sep 9, 2011 | Fire | WILDFIRES | DR |
Within the county
Most affected places
- Denison 107
Quick answers
Frequently asked
How many severe weather events have been recorded in Grayson County, Texas?
1,075 events are on record between 1952 and 2026, causing 10 direct deaths and $67.3M in property damage.
What is the most common severe weather hazard in Grayson County?
Hail, with 480 recorded events — 44.7% of everything in the archive for this county.
How many tornadoes have crossed Grayson County?
72 mapped tornado paths intersect the county boundary; 67 of them touched down inside it. This is derived from path geometry, not county-tagged reports.
How many federal disaster declarations cover Grayson County?
21 federal disaster declarations from FEMA include Grayson County, each tied to a specific incident period.
How risky is Grayson County compared with the rest of the country?
FEMA's National Risk Index rates Grayson County as relatively low risk, placing it in the 80 percentile of its state for expected annual loss.
Where does the Grayson County, Texas severe weather history data come from?
Every figure is drawn from United States federal public-domain records: NOAA/NCEI Storm Events for the event archive, NOAA SPC SVRGIS for mapped tornado paths, FEMA for disaster declarations and risk ratings, and the U.S. Census for population context. Dates are shown in UTC and recent entries may still be revised by NOAA.
Nearby
Neighbouring counties
- Gray County 847
- Gregg County 635
- Gonzales County 225
- Grimes County 207
- Goliad County 180
- Guadalupe County 365
Cite this page
“Grayson County, Texas.” Severe Weather History. severeweatherhistory.com/county/texas/grayson-county/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.