Natural disaster risk in Hillsborough County, New Hampshire
New Hampshire · population 422,867 · FIPS 33011
Overall: relatively moderate risk
Hillsborough County has a composite risk score of 89.8 out of 100 — higher than 89% of US counties. It ranks 1 of 10 in New Hampshire (1 = highest risk). Its highest-rated hazards are ice storm, lightning, winter weather.
Drought now: No, but abnormally dry (D0)
No drought, but abnormally dry. On the U.S. Drought Monitor map valid 13 October 2026, 48.02% of Hillsborough County is D0 Abnormally Dry and none of it is in drought (D1 to D4). Some of it has been abnormally dry or worse for at least 54 weeks in a row.
Drought in Hillsborough County: the last 52 weeks · droughtmonitor.unl.edu
The U.S. Drought Monitor is jointly produced by the National Drought Mitigation Center at the University of Nebraska-Lincoln, the United States Department of Agriculture, the National Oceanic and Atmospheric Administration and the National Aeronautics and Space Administration. Map courtesy of NDMC.
Risk, loss, vulnerability and resilience
| Measure | Rating and score |
|---|---|
| Overall risk Expected annual loss, adjusted for social vulnerability and community resilience. |
Relatively moderate 89.8 |
| Expected annual loss About $120.3 million a year, on average, across all 18 hazards. |
Relatively moderate 92.4 |
| Social vulnerability Higher means people may find it harder to prepare and recover. |
Very low 10.6 |
| Community resilience Higher means a stronger ability to prepare, adapt and recover. |
Relatively high 64.3 |
Risk by hazard
FEMA's risk rating for each of 18 natural hazards in Hillsborough County, highest first. "Not applicable" means the hazard is not modelled here.
| Hazard | Risk rating and score |
|---|---|
| Ice storm | Very high 95 |
| Lightning | Relatively high 93 |
| Winter weather | Relatively high 87 |
| Strong wind | Relatively high 86 |
| Hurricane | Relatively moderate 92 |
| Inland (riverine) flooding | Relatively moderate 92 |
| Tornado | Relatively moderate 82 |
| Cold wave | Relatively moderate 66 |
| Earthquake | Relatively low 88 |
| Landslide | Relatively low 84 |
| Heat wave | Relatively low 75 |
| Wildfire | Relatively low 67 |
| Drought | Relatively low 57 |
| Hail | Relatively low 55 |
| Avalanche | Very low 15 |
| Coastal flooding | Not applicable |
| Tsunami | Not applicable |
| Volcanic activity | Not applicable |
FEMA disaster declarations for Hillsborough County
Federal declarations that designated Hillsborough County, since 1 Jan 2024 (the period this site keeps from OpenFEMA). Older declarations are in FEMA's own dataset.
Not since 1 Jan 2024: no FEMA disaster declaration in the records this site read names Hillsborough County.
All FEMA declarations in New Hampshire, with estimated apply-by dates · Open FEMA deadlines
This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s). Dataset: Disaster Declarations Summaries - v2.
How to read these ratings
- Ratings run in five steps: very low, relatively low, relatively moderate, relatively high and very high. They compare a county with every other US county; they are not a measure of danger on their own.
- Scores run from 0 to 100 and are national percentiles. The bar shows the score: a score of 80 means a higher value than 80% of US counties.
- Overall risk combines the expected annual loss with social vulnerability and community resilience.
- Expected annual loss is the average yearly loss to buildings, people and agriculture the model expects from all 18 hazards.
- Social vulnerability describes how hard it may be for people to prepare for and recover from a disaster. Higher is worse.
- Community resilience describes a community's ability to prepare, adapt and recover. Higher is better.
- "Not applicable" means FEMA does not model that hazard there (for example, hurricanes far inland).
About this data
Source: FEMA National Risk Index, version 1.20, released December 2025, published by the Federal Emergency Management Agency (US public domain). About the National Risk Index. The index is a model of relative risk built from historical hazard records, what is exposed and community factors. It is not a forecast, it does not describe any single property, and it is not insurance or financial advice. For decisions about a specific address, check FEMA's flood maps and your local emergency management office.
Questions
What is the natural disaster risk in Hillsborough County, New Hampshire?
FEMA's National Risk Index rates the overall risk in Hillsborough County as relatively moderate, with a score of 89.8 out of 100 (higher than 89% of US counties). That is a comparison with other US counties, not a forecast.
What are the biggest natural hazards in Hillsborough County?
The hazards rated highest for Hillsborough County are ice storm (very high), lightning (relatively high), winter weather (relatively high).
What is the flood risk in Hillsborough County?
FEMA rates inland (river and rain) flooding risk in Hillsborough County as relatively moderate. For a specific property, check the FEMA flood map and your local floodplain office.
Has Hillsborough County had a FEMA disaster declaration?
Not since 1 Jan 2024: no FEMA disaster declaration in the records this site read names Hillsborough County.
Is Hillsborough County in a drought?
No drought, but abnormally dry. On the U.S. Drought Monitor map valid 13 October 2026, 48.02% of Hillsborough County is D0 Abnormally Dry and none of it is in drought (D1 to D4). Some of it has been abnormally dry or worse for at least 54 weeks in a row.
Every county in New Hampshire, ranked · All states · Disasters near me