Williamson County, Texas: hazard risk
FEMA rates Williamson County's overall risk Relatively Moderate (score 90.1 of 100, higher than 90% of rated U.S. counties); 5 of its 14 hazards are rated Relatively High or Very High, led by winter weather, hail, cold wave. Its storm record holds 1,069 events since 1950.
FEMA's rating for each hazard
These are FEMA's county-wide model ratings and this county's storm record. They are not an assessment of any property, address or building, and not insurance advice: a property's risk depends on its own elevation, construction and location.
FEMA gives each hazard its own rating, and a rating does not follow the score from one hazard to the next: a hazard with a higher score can carry a lower rating than another. The table sorts by FEMA's rating, then by score (0 to 100, the county against every other county for that hazard).
| Hazard | Risk rating | Score | Expected annual loss |
|---|---|---|---|
| Winter Weather | Very High | 96.8 | $1.5M |
| Hail | Relatively High | 98.7 | $14M |
| Cold Wave | Relatively High | 95.9 | $21M |
| Tornado | Relatively High | 93.9 | $17M |
| Lightning | Relatively High | 88.8 | $1.8M |
| Riverine Flooding | Relatively Moderate | 91.3 | $71M |
| Heat Wave | Relatively Moderate | 91.0 | $5.3M |
| Ice Storm | Relatively Moderate | 72.5 | $403K |
| Drought | Relatively Moderate | 72.4 | $964K |
| Strong Wind | Relatively Moderate | 55.9 | $1.0M |
| Wildfire | Relatively Low | 87.8 | $1.6M |
| Hurricane | Relatively Low | 69.0 | $860K |
| Earthquake | Very Low | 36.5 | $197K |
| Landslide | Very Low | 24.1 | $278 |
Source: FEMA National Risk Index, December 2025 release. A model of future loss, not a count of past events. FEMA's National Risk Index map.
What the record holds
| Hazard | Records | Deaths | Damage | Rank in state | Rank in U.S. |
|---|---|---|---|---|---|
| Hail | 458 | 0 | $291M | 78th of 254 | 763rd of 3,080 |
| Severe thunderstorm wind | 209 | 0 | $7.1M | 85th of 254 | 2050th of 3,080 |
| Floods | 171 | 5 | $39M | 30th of 254 | 749th of 3,080 |
| Drought | 75 | 0 | – | 157th of 254 | 652nd of 3,063 |
| Tornadoes | 71 | 29 | $230M | 65th of 254 | 736th of 3,080 |
| Winter storms | 45 | 1 | $22M | 89th of 254 | 2386th of 3,077 |
| Lightning | 9 | 1 | $1.6M | 50th of 254 | 1168th of 3,080 |
| Extreme cold | 7 | 2 | – | 134th of 254 | 2149th of 3,076 |
| Heat | 6 | 1 | – | 139th of 254 | 1844th of 3,076 |
| Wildfires | 5 | 0 | $4.8M | 109th of 254 | 550th of 2,972 |
| High wind and dust storms | 4 | 0 | $14K | 172nd of 254 | 2890th of 3,080 |
| Heavy rain | 1 | 1 | – | 154th of 254 | 2263rd of 3,080 |
Source: NOAA NCEI Storm Events Database, 1950 to 2026-06-30; damage in 2025 dollars. Search the record at NCEI.
The full Williamson County record: every hazard by year and month, the deadliest events and FEMA's declarations.