Round Rock, TX
Local storm history & FEMA National Risk Index data
Round Rock is rated Relatively Moderate for overall natural hazard risk — near the middle compared to other US counties — based on FEMA's National Risk Index for Williamson County, TX. The county's highest-rated hazards are hail, winter weather, and cold wave.
Storm events near Round Rock
NOAA-recorded tornado, hail, and flood events within 25 miles of Round Rock's center, 2016–2026 — the only hazards NOAA reports with exact coordinates, so these counts are specific to Round Rock itself, not the whole county.
County-wide hazard risk
Every other hazard FEMA and NOAA track — including drought — is only scored at the county level. These are Williamson County's FEMA National Risk Index scores, covering Round Rock along with the rest of the county, not a Round Rock-specific figure.
| Hazard | NRI score | Rating |
|---|---|---|
| Wildfire | 87.8 | Relatively Low |
| Inland Flooding | 91.3 | Relatively Moderate |
| Coastal Flooding | — | Not Applicable |
| Earthquake | 36.5 | Very Low |
| Heat Wave | 91 | Relatively Moderate |
| Tornado | 93.9 | Relatively High |
| Avalanche | — | Not Applicable |
| Cold Wave | 95.9 | Relatively High |
| Drought | 72.4 | Relatively Moderate |
| Hail | 98.7 | Relatively High |
| Hurricane | 69 | Relatively Low |
| Ice Storm | 72.5 | Relatively Moderate |
| Landslide | 24.1 | Very Low |
| Lightning | 88.8 | Relatively High |
| Strong Wind | 55.9 | Relatively Moderate |
| Tsunami | — | Not Applicable |
| Volcanic Activity | — | Not Applicable |
| Winter Weather | 96.8 | Very High |
Source: FEMA National Risk Index v1.20.0, December 2025. See the methodology page for definitions, or the full Williamson County risk profile for disaster declarations, social vulnerability, and climate projection data.
Other cities in Williamson County:
More on Williamson County:
Frequently asked questions
What natural hazards is Round Rock, TX at risk of?
Round Rock is rated Relatively Moderate for overall natural hazard risk by FEMA's National Risk Index — near the middle compared to other US counties. The highest-rated hazards for Williamson County, where Round Rock is located, are hail, winter weather, and cold wave.
What is Round Rock's biggest natural hazard risk?
Hail is the highest-rated hazard for Williamson County, where Round Rock is located, scoring 98.7 out of 100 on FEMA's National Risk Index (rated "Relatively High").
Is Round Rock a high-risk area for natural disasters?
Somewhat — Round Rock carries near the middle compared to other US counties for overall natural hazard risk, per FEMA's National Risk Index rating of "Relatively Moderate" for Williamson County.
Has Round Rock had tornadoes, hail, or flooding?
NOAA has recorded 19 tornado, 349 hail, 116 inland flooding events within 25 miles of Round Rock since 2016.