New Jersey ice storm risk
Middlesex County has the highest ice storm risk in New Jersey, scoring 99.2 out of 100 — rated "Very High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Middlesex County | 99.2 | Very High |
| 2 | Burlington County | 96.4 | Very High |
| 3 | Mercer County | 96.3 | Very High |
| 4 | Camden County | 95.7 | Very High |
| 5 | Union County | 95.1 | Very High |
| 6 | Ocean County | 94.5 | Relatively High |
| 7 | Monmouth County | 94.4 | Relatively High |
| 8 | Somerset County | 90.8 | Relatively High |
| 9 | Gloucester County | 88.4 | Relatively High |
| 10 | Salem County | 88.3 | Relatively High |
| 11 | Hunterdon County | 86.2 | Relatively High |
| 12 | Bergen County | 80.3 | Relatively Moderate |
| 13 | Essex County | 78.7 | Relatively Moderate |
| 14 | Hudson County | 74.8 | Relatively Moderate |
| 15 | Passaic County | 74.8 | Relatively Moderate |
| 16 | Cumberland County | 70.2 | Relatively Moderate |
| 17 | Atlantic County | 66.5 | Relatively Moderate |
| 18 | Warren County | 61 | Relatively Moderate |
| 19 | Morris County | 59.6 | Relatively Low |
| 20 | Sussex County | 54 | Relatively Low |
| 21 | Cape May County | 47.7 | Relatively 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 New Jersey:
Frequently asked questions
What is the highest ice storm risk county in New Jersey?
Middlesex County, NJ has the highest ice storm risk in New Jersey, with a FEMA National Risk Index score of 99.2 out of 100 (rated "Very High").
How many counties in New Jersey are rated Very High for ice storm risk?
5 of 21 scored New Jersey counties are rated "Very High" for ice storm risk by FEMA's National Risk Index.
What causes ice storm risk in New Jersey?
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.