Carroll County, New Hampshire

What hazards hit Carroll County most?

The most frequent records are winter storm records: 408 since 1996. 50% of its winter storm records since 1996 fell in January and February. The rank column places the county among New Hampshire's counties by days with a record per 1,000 square miles of land over each hazard's complete period.

Source: NOAA NCEI Storm Events Database (county and forecast-zone records attributed to the county; a zone record shows its own totals on each county it covers). Days: dates with at least one record of the hazard in the county. Ranks: days with a record per 1,000 square miles of land (Census Bureau 2024 Gazetteer), since 1950 for tornadoes, 1955 for hail and thunderstorm wind, 1996 for the rest.

How many tornadoes has Carroll County had?

NOAA records 10 tornadoes in Carroll County from 1963 to 2020, the strongest rated EF2, with 0 deaths and 0 injuries recorded in the county. A tornado that crossed a county line is counted in each county it touched, with the length of its path inside the county.

Counted as whole tornadoes rather than county records, the Storm Prediction Center's database holds 9 tornadoes whose track touched Carroll County since 1950 (NOAA's county records number 10: they file a crossing tornado once per county segment, and the two databases differ on some tracks); along their whole tracks they killed 0 people.

Map of the strongest tornado tracks in New Hampshire.

Source: NOAA NCEI Storm Events Database, tornado records by county (path length in the county, maximum width); ratings as published: F scale before February 1, 2007, EF scale after. Whole-track figures: NOAA Storm Prediction Center tornado database (1950-2025). SPC severe weather database.

When was the last damaging storm in Carroll County?

The most recent record with damage, injuries or deaths is the June 18, 2026 thunderstorm wind (1 injury and $100,000 in damage in 2025 dollars).

It was determined that there was a second microburst just northeast of the first, along the path of the mesocyclone. There was no visible damage to the backlands of Cow Island, so the NWS Storm Damage Survey Team estimates the second microburst began somewhere just north of Barbers Pole channel before Tuftonboro Neck. This microburst was smaller in areal extent but more intense. Another 1,500 trees, again mostly softwood, were estimated to have been snapped or uprooted. These also caused the majority of the damage observed. There were five vehicles damaged, two of which were total losses. In addition, there were five cabins or outbuildings attached to summer camps that were destroyed and at least another twelve that were damaged by falling trees. Near the Sandy Island Dock several people escaped with minor cuts and scrapes when two trees fell through the shelter they were under. …
National Weather Service event narrative, NOAA Storm Events Database (search the full record, event 1355862)

Source: NOAA NCEI Storm Events Database; every record of 2025-2026 is listed, earlier ones when they caused deaths, injuries or $250,000 of damage (2025 dollars), and every tornado.

The deadliest and costliest records

Source: NOAA NCEI Storm Events Database: deaths and injuries direct and indirect; damage is property plus crops as estimated by the National Weather Service, converted to 2025 dollars.

Is it getting more frequent?

Records per decade for Carroll County's most frequent hazards. Counts rose everywhere after 1996, when NOAA began recording every event type, so compare decades within a hazard's complete period only (the shaded cells come before it).

Source: NOAA NCEI Storm Events Database, records per calendar decade; zone records from the CZ_TYPE field (Z).

What time of year?

50% of its winter storm records since 1996 fell in January and February. The two busiest months are in violet.

Source: NOAA NCEI Storm Events Database, records by the month they began.

Federal disaster declarations for Carroll County

FEMA's register lists 35 declarations that include Carroll County: 24 major disasters, 11 emergencies and 0 fire management assistance declarations. Most were for severe storm (13) and flood (6).

Source: FEMA OpenFEMA Disaster Declarations Summaries (v2), declarations through October 2, 2026; one declaration is counted once however many areas it names. OpenFEMA dataset page.

How many floods has Carroll County had?

NOAA's Storm Events Database holds 135 flood or flash flood records for Carroll County from 1996 to 2026, on 79 days, with 0 deaths. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Carroll County ranks 762nd of 2,942 U.S. counties.

The National Flood Insurance Program has paid $2.8 million on 290 claims filed in Carroll County; the most in one year was 44 in 1998. Claims count insured losses only: uninsured flood damage is not in this file.

Source: FEMA OpenFEMA NFIP Redacted Claims, as of September 8, 2026; claims by year of loss, payments in the dollars of the year paid. OpenFEMA dataset page.

FEMA's modeled risk for Carroll County

FEMA's National Risk Index rates Carroll County Relatively Low overall, with an expected annual loss of $31.0 million. These are FEMA's model estimates of future loss from 18 hazards, not a count of what happened; they can differ from the record above.

Source: FEMA National Risk Index, county table, December 2025 release. FEMA's National Risk Index map.

Counties that share a border with Carroll County

1. Grafton County 1,373
2. York County, ME 1,219
3. Oxford County, ME 1,192
4. Carroll County 1,048
5. Coos County 976
6. Belknap County 584
7. Strafford County 558

Source: U.S. Census Bureau county adjacency file; NOAA NCEI Storm Events Database, records since 1950. The Census Bureau's adjacency file.

Next

• Tornadoes in New HampshireEvery New Hampshire tornado since 1950 and the counties with the most per square mile
• Winter storms in New HampshireThe state's winter storm records, by county, year and month
• The New Hampshire recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in Carroll CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download Carroll County's FEMA declarations (CSV)35 rows: every declaration that named the county, for your own analysis