Connecticut ice storm risk
South Central Connecticut Planning Region has the highest ice storm risk in Connecticut, scoring 96.6 out of 100 — rated "Very High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | South Central Connecticut Planning Region | 96.6 | Very High |
| 2 | Capitol Planning Region | 95.6 | Very High |
| 3 | Western Connecticut Planning Region | 94.7 | Relatively High |
| 4 | Naugatuck Valley Planning Region | 94.4 | Relatively High |
| 5 | Greater Bridgeport Planning Region | 85.6 | Relatively High |
| 6 | Northwest Hills Planning Region | 80.8 | Relatively Moderate |
| 7 | Southeastern Connecticut Planning Region | 78.2 | Relatively Moderate |
| 8 | Northeastern Connecticut Planning Region | 73.2 | Relatively Moderate |
| 9 | Lower Connecticut River Valley Planning Region | 72.8 | 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 Connecticut:
Frequently asked questions
What is the highest ice storm risk county in Connecticut?
South Central Connecticut Planning Region, CT has the highest ice storm risk in Connecticut, with a FEMA National Risk Index score of 96.6 out of 100 (rated "Very High").
How many counties in Connecticut are rated Very High for ice storm risk?
2 of 9 scored Connecticut counties are rated "Very High" for ice storm risk by FEMA's National Risk Index.
What causes ice storm risk in Connecticut?
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.