Florida ice storm risk
Nassau County has the highest ice storm risk in Florida, scoring 53.3 out of 100 — rated "Relatively Low" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Nassau County | 53.3 | Relatively Low |
| 2 | Okaloosa County | 36.6 | Relatively Low |
| 3 | Escambia County | 26.6 | Very Low |
| 4 | Santa Rosa County | 21.9 | Very Low |
| 5 | Walton County | 18.2 | Very Low |
| 6 | Duval County | 17 | Very Low |
| 7 | Jackson County | 13.5 | Very Low |
| 8 | Holmes County | 4.9 | Very Low |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Ice Storm risk nationally:
Other hazard risks in Florida:
Frequently asked questions
What is the highest ice storm risk county in Florida?
Nassau County, FL has the highest ice storm risk in Florida, with a FEMA National Risk Index score of 53.3 out of 100 (rated "Relatively Low").
What causes ice storm risk in Florida?
Ice storm risk covers damaging freezing rain and sleet accumulation, which collapses power lines, trees, and structures. The highest-risk counties cluster in a band from eastern Texas and Arkansas through the Carolinas and New England, where warm Gulf moisture overruns cold arctic air most frequently. Ice storms cause catastrophic and long-lasting power outages. Ice storm and sleet events are reported at forecast-zone level in NOAA Storm Events and are not included in county-level counts.