Grayson County Disaster Risk
Grayson County, Texas
FEMA Risk Rating
Relatively Low
National Percentile
80th
of 3,144 counties
State Rank
#52
of 254 (1 = highest risk)
Flood Risk
80th
percentile
Hazard Risk Breakdown
Flood
River, coastal, and surface flooding risk
Relatively Low
Higher than 80% of US counties
Wildfire
Wildland and wildland-urban interface fire risk
Moderate
Higher than 86% of US counties
Tornado
Tornado and severe thunderstorm risk
Moderate
Higher than 93% of US counties
Earthquake
Seismic activity and ground shaking risk
Relatively Low
Higher than 67% of US counties
Hurricane
Tropical cyclone and hurricane risk
Relatively Low
Higher than 53% of US counties
Risk Overview
About Natural Disaster Risk in Grayson County, Texas
Grayson County faces elevated tornado risk
Grayson County's composite risk score of 80.31 ranks as relatively low but significantly exceeds the Texas state average of 49.00. The county's tornado score of 92.88 is exceptionally high, reflecting its position in a region prone to severe spring storms.
Among Texas's top tornado-prone counties
With a tornado risk score of 92.88, Grayson County ranks in the highest tier statewide for tornado exposure—among the most dangerous tornado counties in Texas. This elevated threat, combined with moderate flood risk (79.52), makes the county particularly vulnerable to spring weather systems.
Tornado risk exceeds neighboring areas
Grayson County's tornado score of 92.88 surpasses similar-sized neighboring counties and is second only to Gregg County (97.90) in the region. The county's position near the Oklahoma border puts it in a natural corridor for spring severe weather.
Tornadoes and floods are primary threats
Tornado risk (92.88) dominates Grayson County's hazard profile, with spring storms regularly producing dangerous conditions across the county. Flood risk (79.52) and wildfire risk (86.04) are also notable secondary threats that affect different areas and seasons.
Prepare for severe weather season
Grayson County residents should have a tornado safety plan, including a designated shelter area, weather alert system, and emergency supplies. Ensure your homeowners policy covers wind and hail damage from severe storms, and consider storm-resistant roofing materials and reinforced garage doors in high-risk areas.
Source: FEMA National Risk Index · Narrative reviewed by Evan Brooks, Data Editor
Preparedness Guide
What to Prepare for in Grayson County
Top Hazards by Exposure
Source: FEMA National Risk Index v1.19.0 · Percentiles are national (3,144 counties)
Risk Advisory: Grayson County
Risk Verdict
Grayson County has a below-average natural disaster risk profile, scoring at the 80th percentile nationally under FEMA's National Risk Index. This risk level calls for more than general awareness: insurance coverage review, a family communication plan, and a prepared go-bag are practical priorities.
Hazard Breakdown
Tornado risk is Grayson County's dominant natural hazard, ranked at the 93th percentile nationally under FEMA's National Risk Index. Wildfire ranks second at the 86th percentile nationally. Additional tracked hazards include flood (80th percentile), earthquake (67th percentile), hurricane (53th percentile).
Preparedness Context
Tornado risk is Grayson County's top-ranked natural hazard at the 93th percentile nationally. For Grayson County households, the most protective action available is identifying a reinforced interior room on the lowest floor — a bathroom, closet, or central hallway away from windows. Alongside tornado exposure, wildfire at the 86th percentile nationally means Grayson County households face multi-hazard severe-weather seasons that benefit from a single integrated emergency plan covering both threats. A battery-powered NOAA All Hazards weather radio with an auto-alert tone is the highest-leverage single item for tornado preparedness in Grayson County, since it delivers warnings even when power is out and phone networks are congested.
Regional Context
Grayson County's composite risk score sits 31.3 points above the Texas county average, placing it among the more hazard-exposed counties in the state.
Is your household prepared for Grayson County's hazards?
Review FEMA's county-specific preparedness checklists and emergency planning guides.
Frequently Asked Questions
What is the natural disaster risk in Grayson County, TX?
What types of natural hazards affect Grayson County?
How does Grayson County risk compare to the Texas average?
Is Grayson County at risk for tornado?
How is natural disaster risk measured?
Why is Grayson County higher risk than average?
Data Source
Risk data sourced from the FEMA National Risk Index (NRI). Risk scores are relative rankings (0–100) across all US counties — not absolute risk measures. Higher scores indicate higher relative risk compared to other counties.
Disclaimer: This data is informational only. It is not financial, insurance, or legal advice. Always consult a qualified professional before making insurance or real estate decisions.