Tornadoes Risk in New Hampshire — Level 1 of 5

New Hampshire has a level 1 (very low) tornado risk, meaning tornadoes are rare but not impossible. When they do occur, they tend to be weak and brief, mainly in summer. Homeowners should understand how to protect their property and know what to do during a warning.

Tornado risk in New Hampshire: What to know

New Hampshire is rated level 1 (very low) on the FEMA National Risk Index for tornadoes. That means the chance of a tornado striking your home is significantly lower than in many other parts of the United States. However, tornadoes have been recorded in every state, and New Hampshire is no exception. Understanding how tornadoes behave here can help you avoid surprises.

New Hampshire tornadoes are most likely from May through August, with a slight peak in July and August. They frequently occur along cold fronts or during squall lines rather than in classic supercell thunderstorms. Most are short-lived and weak, rated EF0 or EF1, but stronger events have happened. For example, the 2008 Deerfield tornado was rated EF2 and caused significant damage.

Geographically, no county is at substantially elevated risk – tornadoes have touched down across the southern half of the state more often, but that is a statistical artifact. The hilly terrain and dense forests of central and northern New Hampshire can also make tornadoes harder to see, which is why relying on weather alerts is critical.

How it affects homes

Because tornadoes are rare and usually weak, the typical damage in New Hampshire is limited, but not zero. The most common types of damage experienced by homes include:

Loss of shingles or partial roof removal
Broken windows and doors from wind-borne debris
Damage to gutters, siding, and fence lines
Uprooted trees or large branches falling on the home
In rare cases, structural failure if the tornado is strong enough

Standard homeowners insurance policies in New Hampshire generally cover wind damage from tornadoes, including damage to the home's structure and personal property. However, flooding caused by a tornado is not covered by standard policies – and flood damage can occur if a tornado spawns heavy rain, or if a burst water line from wind damage leads to interior water damage. Flood insurance requires a separate FEMA-backed policy. Also, be aware that if a tornado causes power loss, food spoilage may be covered under your policy's additional living expenses, but always review your specific policy.

Insurance considerations: In low-risk areas, insurance premiums for wind damage are naturally lower, but you should still document your possessions and keep an inventory. After any tornado, contact your insurer quickly to start a claim.

How to prepare your home

Even in a level‑1 area, preparedness pays off. Use these steps to reduce potential damage and keep your family safe.

Identify your safe location: Choose a basement or an interior room on the lowest floor, away from windows. If you have no basement, a small interior closet or bathroom can work. Practice a tornado drill.
Sign up for emergency alerts: Make sure your phone receives Wireless Emergency Alerts (WEA). Also, have a NOAA Weather Radio with battery backup to receive tornado warnings at night.
Clear your yard: Trim overhanging branches and remove weak or dead trees that could fall on your house. Secure loose items like patio furniture, grills, and trash cans.
Reinforce your roof: If you are re-roofing, use hurricane clips or straps to secure the roof to the walls. Check that the existing ties are intact.
Strengthen doors and windows: Install storm shutters or use plywood panels that you can quickly install over large windows and glass doors. Ensure exterior doors are shock-resistant or have a deadbolt.
Protect your valuable documents: Keep copies of important papers in a fireproof safe or in a cloud-based backup.
Review your insurance: Call your agent to confirm that your policy covers wind damage, and discuss whether you need separate flood insurance.
Make a family communication plan: Decide how you will contact each other and where you will meet if you are separated during a storm.

Frequently asked questions

How often do tornadoes occur in New Hampshire?

Tornadoes are rare. The state averages only one or two tornadoes per year, though some years have none. When they occur, they are usually short-lived and of weak intensity, lasting only a few minutes.

Can a tornado hit the mountains of New Hampshire?

Yes, although the rugged, forested terrain makes tornadoes harder to see and may help to disrupt some storms. There is no place in New Hampshire that is completely safe from tornadoes, but the probability is uniformly low across the state.

Does a tornado warning mean I should go to my basement?

Yes. If your county is under a tornado warning, take shelter immediately in a basement or an interior room on the lowest floor. Put as many walls between you and the outside as possible, and cover your head. Do not try to wait until you see the tornado – warnings can be issued before the storm arrives.

Official resources

Last updated: August 12, 2026. Risk levels are state-wide estimates based on public hazard data — always verify your specific address with the official sources above.