Grayson County, Texas: Natural Disaster Risk and History
Grayson County, Texas has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 80.3 out of 100, higher than about 80% of US counties, with hail, tornadoes and heat waves scoring highest of its 18 hazards and $43 million a year in expected losses.
OpenFEMA lists 19 federal disaster declarations that included Grayson County since 1981, not counting 2 for COVID-19; the latest is DR-4586-TX (Severe Winter Storms, declared 19 February 2021). NOAA's Storm Prediction Center recorded 71 tornadoes touching Grayson County from 1950 to 2025.
Live weather alerts for Texas All official warnings Latest FEMA declarations
Population 135,451 Buildings worth $29 billion Area 989 sq mi Risk rank in Texas 51 of 254 FIPS 48181
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Hail | Relatively Moderate | 93.4 | $2.3 million | about 8.5 a year | 324 |
| Tornado | Relatively High | 92.9 | $9.2 million | about once every 1.1 years | 46 |
| Heat wave | Relatively Moderate | 92.7 | $4.0 million | about 16 a year | 260 |
| Ice storm | Relatively High | 91.6 | $1.1 million | about 1.3 a year | 85 |
| Wildfire | Relatively Low | 86.0 | $774,883 | about once every 667 years | — |
| Cold wave | Relatively Moderate | 82.2 | $4.2 million | about 1.1 a year | 20 |
| Inland flooding | Relatively Moderate | 79.5 | $19 million | about 2.2 a year | 61 |
| Earthquake | Relatively Low | 66.7 | $662,161 | about once every 862 years | — |
| Landslide | Very Low | 60.9 | $2,806 | about once every 5.4 years | — |
| Winter weather | Relatively Low | 57.0 | $82,285 | about 5 a year | 94 |
| Lightning | Relatively Low | 56.2 | $290,569 | about 55 a year | 299,878 strikes |
| Strong wind | Relatively Moderate | 55.7 | $644,197 | about 4 a year | 151 |
| Hurricane | Very Low | 53.3 | $103,364 | about once every 95 years | 4 |
| Drought | Relatively Low | 47.7 | $124,557 | about 28 a year | 1,120 |
| Avalanche | Not Applicable | — | — | — | — |
| Coastal flooding | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic activity | Not Applicable | — | — | — | — |
Score: FEMA's percentile among US counties that face the hazard (higher = more risk). Expected loss: FEMA's modelled average yearly loss to buildings, people (as a statistical value) and crops. How often: FEMA's annualised frequency of the hazard in the county; for some hazards it counts event-days, so it is a rough guide, not a forecast. "Not Applicable" means FEMA does not model that hazard here.
Federal disaster declarations 19
Most common: Severe Storm 5, Fire 4, Hurricane 4, Severe Ice Storm 3.
| Decade | Declarations | Incident types |
|---|---|---|
| 1980s | 2 | Severe Storm, Flood |
| 1990s | 4 | Severe Storm ×2, Fire, Drought |
| 2000s | 9 | Hurricane ×4, Fire ×2, Severe Storm, Other, Severe Ice Storm |
| 2010s | 2 | Severe Storm, Fire |
| 2020s | 2 | Severe Ice Storm ×2 |
The last 10
Widest declarations that included Grayson County
- Severe Winter Storms (2021, DR-4586-TX): 254 Texas counties designated.
- Severe Winter Storm (2021, EM-3554-TX): 254 Texas counties designated.
- Extreme Wildfire Threat (2006, DR-1624-TX): 254 Texas counties designated.
Named storms in its declarations: Hurricane Ike (2008), Hurricane Rita (2005), Hurricane Katrina (2005), Tropical Storm Charley (1998).
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. Texas also had 101 statewide declarations with no county list.
Tornado record since 1950 71
| Tornadoes touching the county | 71 |
|---|---|
| Strongest-rated | (E)F3 ×9 |
| Peak month | April (27) |
| Deadliest | 9 May 2006, F3, 9.3 mi path, 3 killed, 10 injured |
| Longest path | 6 Apr 1955, F2, 37.9 mi path, 0 killed, 1 injured |
| Most recent | 8 Jun 2025, EF1, 4 mi path |
| Deaths / injuries on those paths | 4 / 63 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 34 | 16 | 12 | 9 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 15 | 6 | 17 | 7 | 12 | 7 | 6 | 1 |
Deaths and injuries are for each tornado's whole path, which can run beyond this county. F-scale ratings before February 2007, Enhanced Fujita (EF) after.
How Grayson County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Grayson County (this page) | — | Relatively Low | 80.3 | Hail |
| Marshall County, OK | 45 km | Relatively Low | 49.0 | Ice storm |
| Cooke County | 50 km | Relatively Low | 73.3 | Drought |
| Collin County | 50 km | Relatively High | 98.9 | Hail |
| Fannin County | 53 km | Relatively Low | 68.1 | Drought |
| Bryan County, OK | 54 km | Relatively Low | 74.6 | Ice storm |
Nearest by distance between county centres. Every county in Texas, ranked.
Vulnerability and resilience
| Social vulnerability | Relatively Low 38.7 |
|---|---|
| Community resilience | Relatively Moderate 44.2 |
| Community risk factor | 1.05 |
| Expected annual loss, all hazards | $43 million |
FEMA scales expected losses up where social vulnerability is high (people who may find it harder to prepare, evacuate or recover) and down where community resilience is high. A factor above 1 raises the risk score. For social vulnerability a high rating is worse; for resilience a high rating is better.
Prepare for Grayson County's main hazards
- Right now: National Weather Service alerts for Texas · all official warnings on Global Incident Tracker.
- Hail: Weather alerts for Texas
- Tornado: Is there a tornado warning now?
- Heat wave: Heatstroke warning signs
- Your property's flood zone: FEMA Flood Map Service Center ↗ — this page cannot tell you that.
- Official preparedness guidance: Ready.gov ↗ and your county emergency management office.
What this page shows, and what it misses
FEMA's National Risk Index rates a whole county against every other US county; it is a planning-level estimate for nationwide comparison, not a flood-zone map and not a substitute for a local risk assessment or the risk to one home. Declarations are presidential disaster, emergency and fire management declarations that named this county; state declarations and SBA or USDA designations are not included. Tornadoes are counted when the county is one of up to four listed on the track; 670 tornadoes that crossed a state line carry no county list in NOAA's file and are left out.
Federal Emergency Management Agency (FEMA), National Risk Index Dataset: National Risk Index Counties - v1.20.0 (December 2025). Retrieved from https://services.arcgis.com/XG15cJAlne2vxtgt/ArcGIS/rest/services/National_Risk_Index_Counties/FeatureServer/0/query on November 2, 2026, 1:20 PM EST. This product uses the Federal Emergency Management Agency’s National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Federal Emergency Management Agency (FEMA), OpenFEMA Dataset: Disaster Declarations Summaries - v2, retrieved from https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries on November 2, 2026, 1:21 PM EST. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Tornado records: NOAA/NWS Storm Prediction Center, Severe Weather Database, tornadoes 1950–2025 (https://www.spc.noaa.gov/wcm/data/1950-2025_actual_tornadoes.csv, downloaded 2 November 2026). Public domain; not endorsed by NOAA. Compiled by Global Incident Tracker.
Questions about Grayson County
What natural disasters is Grayson County, Texas most at risk from?
Grayson County, Texas has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 80.3 out of 100, higher than about 80% of US counties, with hail, tornadoes and heat waves scoring highest of its 18 hazards and $43 million a year in expected losses.
How many federal disaster declarations has Grayson County had?
OpenFEMA lists 19 federal disaster declarations that included Grayson County since 1981, not counting 2 for COVID-19; the latest is DR-4586-TX (Severe Winter Storms, declared 19 February 2021). Another 101 Texas declarations were made statewide without a county list.
How many tornadoes have hit Grayson County?
NOAA's Storm Prediction Center recorded 71 tornadoes touching Grayson County from 1950 to 2025. The deadliest: 9 May 2006, F3, 9.3 mi path, 3 killed, 10 injured (deaths and injuries are for the whole path).
Is the National Risk Index a flood zone map?
No. The National Risk Index is a planning-level estimate for a whole county, built for nationwide comparison. It does not tell you the flood zone or the risk of a single property: for that, look up the address on FEMA's Flood Map Service Center (msc.fema.gov) and ask your local floodplain manager.