Enter any address in Grafton County, New Hampshire to see its FEMA flood zone
Flash flooding events are the most frequent type of flood recorded in Grafton County, NH over the last 30 years, with 107 such events documented. In addition to flash floods, 158 general flood events and 5 tropical storm events have occurred. For example, on July 10, 2024, heavy rainfall associated with the remnants of Tropical Storm Beryl led to significant runoff and flooding across northern New Hampshire.
National Flood Insurance Program (NFIP) data shows that properties in Zone A have experienced the highest number of claims, with 198 claims filed. These claims averaged a payout of $17,274 and an average water depth of 4.5 feet. Properties in Zone X also saw substantial claims, averaging $12,920 with 1.9 feet of water depth.
Homeowners in areas designated as Zone A, as well as those in Zone X, should pay particular attention to flood risk. Properties with a history of claims or those located in areas with documented water depth during flood events warrant careful consideration.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
120 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Grafton County, New Hampshire has recorded 270 flood-related events since 1996 according to NOAA's Storm Events Database, including 107 flash floods and 158 river or area floods. The county has received 40 federal disaster declarations, 8 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1973–2024)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Severe Storm And Flooding | Severe Storm | Jul 10, 2024 |
| Severe Winter Storm And Flooding | Winter Storm | Apr 3, 2024 |
| Severe Storms And Flooding | Severe Storm | Jan 9, 2024 |
| Severe Storm And Flooding | Severe Storm | Dec 17, 2023 |
| Severe Storms And Flooding | Flood | Jul 9, 2023 |
| Severe Storm And Flooding | Severe Storm | Dec 22, 2022 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Storm And Flooding | Severe Storm | Jul 11, 2019 |
| Severe Storm And Flooding | Severe Storm | Oct 29, 2017 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | Jul 31, 2024 | 0.00K |
| Flash Flood | Jul 30, 2024 | 0.00K |
| Flood | Apr 12, 2024 | 0.00K |
| Flash Flood | Jul 10, 2024 | 0.00K |
| Flash Flood | Jul 6, 2024 | 0.00K |
| Flash Flood | Jun 28, 2023 | 0.00K |
| Flash Flood | Jun 25, 2023 | 0.00K |
| Flash Flood | Jul 18, 2023 | 0.00K |
| Flash Flood | Dec 18, 2023 | 0.00K |
| Flood | Dec 18, 2023 | 250.00K |
Flash Flood — Jul 31, 2024
An area of low pressure supported widespread showers and thunderstorms on July 30th and 31st. Slow storm motions allowed heavy rain to fall over the same area, with high rainfall rates over 2 inches per hour. The most significant flooding occurred over Grafton County where saturated ground conditions and steep terrain supported flash flooding in Piermont.
Flash Flood — Jul 30, 2024
An area of low pressure supported widespread showers and thunderstorms on July 30th and 31st. Slow storm motions allowed heavy rain to fall over the same area, with high rainfall rates over 2 inches per hour. The most significant flooding occurred over Grafton County where saturated ground conditions and steep terrain supported flash flooding in Piermont.
Flood — Apr 12, 2024
A cold front brought widespread soaking rainfall to the area. This rainfall combined with significant snowpack loss and saturated grounds to produce minor to moderate river flooding, with isolated flash flooding across the mountains. Repeated rounds of rain compressed, warmed, and ripened the area snowpack in advance of the heavier rain on Friday the 12th. The combination of rain, strong winds,...
Flash Flood — Jul 10, 2024
On July 10th the remnants of Tropical Storm Beryl phased with a low pressure system out of the Great Lakes to bring multiple rounds of heavy rainfall to northern New England, including Maine and New Hampshire. The previous 3 days had brought a swath of heavy rain just north of the White Mountains, saturating the ground and making it ideal for runoff. During the roughly 36 hour period, 3 to as m...
Flash Flood — Jul 6, 2024
A slow moving cold front triggered scattered thunderstorms across northern New Hampshire on July 6th. Repeating storms across Grafton and Coos Counties produced locally heavy rainfall resulting in localized areas of road washouts.
Source: NOAA National Weather Service Storm Events Database.
Source: OpenFEMA NFIP Individual Claims (2.25M records analyzed).
FEMA assigns flood zone designations to areas in Grafton County, New Hampshire:
AE High Risk — 1% annual chance of flooding. Insurance required.
VE Very High Risk — Coastal flooding with wave action.
X (Shaded) Moderate Risk — 500-year floodplain.
X Low Risk — Outside major floodplains.
Properties in Grafton County, New Hampshire that are in FEMA-designated Special Flood Hazard Areas (zones A and V) with federally backed mortgages are required to carry flood insurance.
Even outside high-risk zones, flood insurance is recommended. From 2014 to 2024, nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area.
Visit FloodSmart.gov to find an agent and get a quote.