FEMA NRI 1.19.0Updated Nov 2023 · Coverage 2014–2023Methodology

New Hampshire Disaster Risk

Natural disaster risk data for all 10 counties.

Avg FEMA Rating

Relatively Low

Avg Percentile

70th

Counties with Data

of 10 total

County risk atlas

New Hampshire hazard exposure by county

A compact 2.5D surface of FEMA National Risk Index percentiles. Toggle composite, flood, wildfire, hurricane, tornado, and earthquake risk to see which counties carry the highest relative exposure without loading the full national explorer dataset.

Counties

10/10

Avg composite

70th

Risk layers

Highest Risk Counties

Hillsborough County

Relatively Moderate

90th percentile

Rockingham County

Relatively Moderate

86th percentile

Grafton County

Relatively Moderate

82th percentile

Merrimack County

Relatively Low

78th percentile

Coos County

Relatively Low

73th percentile

Lowest Risk Counties

Sullivan County

Very Low

38th percentile

Belknap County

Relatively Low

57th percentile

Cheshire County

Relatively Low

60th percentile

Strafford County

Relatively Low

64th percentile

Carroll County

Relatively Low

71th percentile

All New Hampshire Counties

County	Percentile	FEMA Rating	Flood	Wildfire	Tornado	Earthquake
Hillsborough County	90th	Relatively Moderate	92.6	67.0	82.6	88.2
Rockingham County	86th	Relatively Moderate	92.8	47.8	73.5	87.5
Grafton County	82th	Relatively Moderate	90.1	30.9	24.4	69.6
Merrimack County	78th	Relatively Low	85.8	35.2	56.2	76.1
Coos County	73th	Relatively Low	77.6	16.4	10.6	49.0
Carroll County	71th	Relatively Low	82.0	33.6	18.9	62.8
Strafford County	64th	Relatively Low	76.0	34.5	42.2	77.4
Cheshire County	60th	Relatively Low	74.8	24.5	43.6	58.0
Belknap County	57th	Relatively Low	70.3	25.3	31.4	59.8
Sullivan County	38th	Very Low	60.6	13.7	22.7	43.1

Frequently Asked Questions

Which county in New Hampshire has the highest natural disaster risk?

Hillsborough County has the highest natural disaster risk in New Hampshire, rated Relatively Moderate (90th percentile nationally), based on FEMA National Risk Index data.

Which county in New Hampshire is the safest from natural disasters?

Sullivan County has the lowest natural disaster risk in New Hampshire, rated Very Low (38th percentile nationally), based on FEMA NRI data.

What natural disasters are most common in New Hampshire?

New Hampshire counties face varying levels of risk from floods, wildfires, tornadoes, earthquakes, and hurricanes. The FEMA National Risk Index scores each county across 18 hazard types. See individual county pages for detailed hazard breakdowns.

How is natural disaster risk measured by county?

The FEMA National Risk Index (NRI) measures natural disaster risk using expected annual loss, social vulnerability, and community resilience. Scores are normalized nationally, with ratings from Very Low to Very High across 18 natural hazard types.

Prepare your household for natural disasters

FEMA's Ready.gov provides county-specific preparedness checklists and emergency planning guides.

FEMA Ready Guide →

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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