riskbycounty
FEMA National Risk Index

Rockingham County Disaster Risk

Rockingham County, New Hampshire

FEMA Risk Rating

Relatively Moderate

National Percentile

86th

of 3,144 counties

State Rank

#2

of 10 (1 = highest risk)

Flood Risk

93th

percentile

Hazard Risk Breakdown

Flood

River, coastal, and surface flooding risk

Moderate

Higher than 93% of US counties

Wildfire

Wildland and wildland-urban interface fire risk

Relatively Low

Higher than 48% of US counties

Tornado

Tornado and severe thunderstorm risk

Relatively Low

Higher than 74% of US counties

Earthquake

Seismic activity and ground shaking risk

Moderate

Higher than 88% of US counties

Hurricane

Tropical cyclone and hurricane risk

Moderate

Higher than 84% of US counties

Risk Advisory: Rockingham County

Risk Verdict

Rockingham County has a relatively moderate overall disaster risk profile, scoring in the 86th percentile nationally. While not in the highest tier, this county faces meaningful hazard exposure. Residents are encouraged to understand their specific risks and maintain emergency supplies.

Hazard Breakdown

Flood risk is the dominant hazard for Rockingham County, scoring in the 93th percentile nationally. It is followed by earthquake risk at the 88th percentile. Additional hazards include hurricane (84th), tornado (74th), wildfire (48th).

Preparedness Context

With flood risk as the top concern, Rockingham County residents should review flood insurance needs (standard home insurance does not cover flood damage), know your evacuation zone, and keep important documents waterproofed. Secondary risks such as earthquake also warrant attention in household and community preparedness planning. FEMA recommends all households maintain at least 72 hours of food, water, and medication supplies regardless of specific hazard exposure.

Regional Context

Rockingham County is significantly riskier than the average county in New Hampshire. Its composite risk score is 16 points higher than the state average, meaning residents face above-average exposure to natural hazards compared to their neighbors.

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Frequently Asked Questions

What is the natural disaster risk in Rockingham County, NH?
Rockingham County has a FEMA National Risk Index rating of Relatively Moderate, placing it in the 86th percentile nationally out of 3,144 counties. This composite score reflects the county's overall exposure to natural hazards including floods, wildfires, tornadoes, earthquakes, and hurricanes, weighted by expected annual loss and social vulnerability.
What types of natural hazards affect Rockingham County?
Rockingham County is evaluated for five major natural hazard types: flooding (93th percentile), earthquake (88th percentile), hurricane (84th percentile), tornado (74th percentile), wildfire (48th percentile). The highest-risk hazard is flooding at the 93th percentile nationally. These scores are derived from FEMA's National Risk Index, which analyzes expected annual loss, social vulnerability, and community resilience for each hazard type.
How does Rockingham County risk compare to the New Hampshire average?
Rockingham County's composite risk percentile is 86th, compared to the New Hampshire state average of 70th percentile. The state's overall risk rating is Relatively Low. This means Rockingham County faces higher natural disaster risk than the typical county in New Hampshire.
Is Rockingham County at risk for flooding?
Yes, Rockingham County's flooding risk is at the 93th percentile nationally. This places it in the top quartile for this hazard type.
How is natural disaster risk measured?
FEMA's National Risk Index (NRI) calculates risk scores for 18 natural hazard types across all U.S. counties and census tracts. The composite score combines Expected Annual Loss (estimated dollar losses from each hazard), Social Vulnerability (demographic factors affecting disaster impact), and Community Resilience (ability to recover). Percentile scores rank each county against all 3,144 U.S. counties, and risk ratings range from Very Low to Very High.
Why is Rockingham County higher risk than average?
Rockingham County's composite risk score of 86th percentile is above the New Hampshire state average of 70th percentile. This elevated risk is driven by flooding exposure (93th percentile), along with earthquake and hurricane and tornado risk. Geographic location, terrain, climate patterns, and proximity to flood zones or fault lines all influence a county's risk profile.

Counties with Similar Risk

Hillsborough County

New Hampshire

+3.9

Relatively Moderate

90th percentile

Grafton County

New Hampshire

-4.1

Relatively Moderate

82th percentile

Merrimack County

New Hampshire

-7.6

Relatively Low

78th percentile

By Logan Johnson, Founder & Data EditorUpdated Reviewed by Logan Johnson, Founder & Data Editor

Data Source

Risk data sourced from the FEMA National Risk Index (NRI). Risk scores are relative rankings (0–100) across all US counties — not absolute risk measures. Higher scores indicate higher relative risk compared to other counties.

Disclaimer: This data is informational only. It is not financial, insurance, or legal advice. Always consult a qualified professional before making insurance or real estate decisions.

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