Delaware ice storm risk
New Castle County has the highest ice storm risk in Delaware, scoring 89 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | New Castle County | 89 | Relatively High |
| 2 | Sussex County | 82.1 | Relatively Moderate |
| 3 | Kent County | 67.7 | Relatively Moderate |
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 Delaware:
Frequently asked questions
What is the highest ice storm risk county in Delaware?
New Castle County, DE has the highest ice storm risk in Delaware, with a FEMA National Risk Index score of 89 out of 100 (rated "Relatively High").
What causes ice storm risk in Delaware?
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.