Coos County
New Hampshire — Natural Disaster Risk Assessment
LowComposite Risk Score
National percentile: 73th
Coos County faces low composite natural disaster risk (NRI Risk Index score 72.8, 73th national percentile), driven primarily by avalanche and winter weather exposure. Expected annual loss across all 18 hazard types is $27M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Avalanche | Very High | 0.27 / yr | $5M |
| Winter Weather | High | 24.09 / yr | $312K |
| Cold Wave | Medium | 6.81 / yr | $5M |
| Landslide | Low | 2.54 / yr | $16K |
| Riverine Flood | Medium | 2.39 / yr | $15M |
| Hurricane | Low | 0.05 / yr | $1M |
| Ice Storm | Medium | 0.25 / yr | $180K |
| Lightning | Low | 18.71 / yr | $219K |
| Earthquake | Very Low | 0.00 / yr | $222K |
| Strong Wind | Low | 0.39 / yr | $182K |
| Wildfire | Very Low | 0.00 / yr | $5K |
| Heat Wave | Very Low | 0.31 / yr | $24K |
| Tornado | Very Low | 0.12 / yr | $63K |
| Hail | Very Low | 0.90 / yr | $15K |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Drought | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Frequently Asked Questions
What is the overall natural disaster risk for Coos County?
Coos County has a composite FEMA National Risk Index score of 72.8 out of 100, placing it in the Low category and the 73th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Coos County?
The three highest-rated hazards are Avalanche (Very High, $5M EAL), Winter Weather (High, $312K EAL), Cold Wave (Medium, $5M EAL). These account for most of the county's expected annual losses.
How does Coos County compare to other New Hampshire counties?
Coos County ranks #5 of 10 New Hampshire counties for overall natural disaster risk, with a low rating.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. Coos County's $27M EAL is a statistical average, not a guarantee for any specific year or address.