Plymouth County, Massachusetts: Natural Disaster Risk and History
Plymouth County, Massachusetts has a Relatively Moderate natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 90.4 out of 100, higher than about 90% of US counties, with coastal flooding, inland (river and flash) flooding and strong winds scoring highest of its 18 hazards and $114 million a year in expected losses.
OpenFEMA lists 30 federal disaster declarations that included Plymouth County since 1972, not counting 2 for COVID-19; the latest is EM-3599-MA (Hurricane Lee, declared 15 September 2023). NOAA's Storm Prediction Center recorded 11 tornadoes touching Plymouth County from 1950 to 2025.
Live weather alerts for Massachusetts All official warnings Latest FEMA declarations
Population 530,320 Buildings worth $115 billion Area 1,104 sq mi Risk rank in Massachusetts 7 of 14 FIPS 25023
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Coastal flooding | Very High | 94.4 | $14 million | about 7.1 a year | — |
| Inland flooding | Relatively Moderate | 92.9 | $71 million | about 2.3 a year | 65 |
| Strong wind | Relatively High | 92.6 | $3.2 million | about once every 1.5 years | 18 |
| Hurricane | Relatively Moderate | 90.7 | $11 million | about once every 5.7 years | 54 |
| Lightning | Relatively High | 90.6 | $1.6 million | about 19 a year | 169,959 strikes |
| Earthquake | Relatively Low | 87.7 | $4.9 million | about once every 690 years | — |
| Heat wave | Relatively Moderate | 83.9 | $2.5 million | about 5.1 a year | 54 |
| Ice storm | Relatively High | 83.1 | $689,835 | about once every 1.6 years | 31 |
| Drought | Relatively Moderate | 70.0 | $690,039 | about 3.2 a year | 203 |
| Cold wave | Relatively Low | 61.6 | $2.0 million | about once a year | 12 |
| Landslide | Very Low | 61.6 | $3,966 | about once every 5.2 years | — |
| Wildfire | Very Low | 53.8 | $77,516 | rarer than once in 1,000 years | — |
| Tornado | Relatively Low | 48.2 | $1.5 million | about once every 6.9 years | 7 |
| Winter weather | Relatively Low | 39.7 | $59,742 | about 11 a year | 135 |
| Hail | Very Low | 7.1 | $26,985 | about 1.3 a year | 55 |
| Avalanche | Not Applicable | — | — | — | — |
| Tsunami | Insufficient Data | — | — | — | — |
| Volcanic activity | Not Applicable | — | — | — | — |
Score: FEMA's percentile among US counties that face the hazard (higher = more risk). Expected loss: FEMA's modelled average yearly loss to buildings, people (as a statistical value) and crops. How often: FEMA's annualised frequency of the hazard in the county; for some hazards it counts event-days, so it is a rough guide, not a forecast. "Not Applicable" means FEMA does not model that hazard here.
Federal disaster declarations 30
Most common: Hurricane 9, Severe Storm 7, Snowstorm 6, Flood 5.
| Decade | Declarations | Incident types |
|---|---|---|
| 1970s | 3 | Flood ×2, Fishing Losses |
| 1980s | 1 | Hurricane |
| 1990s | 8 | Flood ×3, Snowstorm ×2, Coastal Storm ×2, Hurricane |
| 2000s | 7 | Severe Storm ×3, Snowstorm ×3, Hurricane |
| 2010s | 9 | Hurricane ×5, Severe Storm ×4 |
| 2020s | 2 | Hurricane, Snowstorm |
The last 10
Widest declarations that included Plymouth County
- Hurricane Lee (2023, EM-3599-MA): 14 Massachusetts counties designated.
- Severe Winter Storm, Snowstorm, and Flooding (2013, DR-4110-MA): 14 Massachusetts counties designated.
- Hurricane Sandy (2012, EM-3350-MA): 14 Massachusetts counties designated.
Named storms in its declarations: Hurricane Lee (2023), Hurricane Sandy (2012), Tropical Storm Irene (2011), Hurricane Irene (2011), Hurricane Earl (2010), Hurricane Katrina (2005), Hurricane Bob (1991), Hurricane Gloria (1985).
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. Massachusetts also had 6 statewide declarations with no county list.
Tornado record since 1950 11
| Tornadoes touching the county | 11 |
|---|---|
| Strongest-rated | (E)F2 ×1 |
| Peak month | July (4) |
| Deadliest | 7 Sep 1958, F0, 0.1 mi path, 1 killed, 1 injured |
| Longest path | 4 Jul 1964, F1, 2.3 mi path |
| Most recent | 8 Aug 2023, EF1, 0.9 mi path |
| Deaths / injuries on those paths | 1 / 2 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 5 | 5 | 1 | 0 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 1 | 4 | 0 | 3 | 1 | 0 | 1 | 1 |
Deaths and injuries are for each tornado's whole path, which can run beyond this county. F-scale ratings before February 2007, Enhanced Fujita (EF) after.
How Plymouth County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Plymouth County (this page) | — | Relatively Moderate | 90.4 | Coastal flooding |
| Bristol County | 30 km | Relatively Moderate | 89.9 | Inland flooding |
| Norfolk County | 40 km | Relatively Moderate | 92.0 | Inland flooding |
| Bristol County, RI | 47 km | Very Low | 19.4 | Hurricane |
| Suffolk County | 47 km | Relatively Moderate | 93.5 | Lightning |
| Barnstable County | 49 km | Relatively Moderate | 89.1 | Coastal flooding |
Nearest by distance between county centres. Every county in Massachusetts, ranked.
Vulnerability and resilience
| Social vulnerability | Very Low 12.8 |
|---|---|
| Community resilience | Very High 98.6 |
| Community risk factor | 0.79 |
| Expected annual loss, all hazards | $114 million |
FEMA scales expected losses up where social vulnerability is high (people who may find it harder to prepare, evacuate or recover) and down where community resilience is high. A factor above 1 raises the risk score. For social vulnerability a high rating is worse; for resilience a high rating is better.
Prepare for Plymouth County's main hazards
- Right now: National Weather Service alerts for Massachusetts · all official warnings on Global Incident Tracker.
- Coastal flooding: Flood safety: why shallow water kills · Hurricanes and storms now
- Inland flooding: Flood safety: why shallow water kills · Floods recorded
- Strong wind: Power outages now
- Your property's flood zone: FEMA Flood Map Service Center ↗ — this page cannot tell you that.
- Official preparedness guidance: Ready.gov ↗ and your county emergency management office.
What this page shows, and what it misses
FEMA's National Risk Index rates a whole county against every other US county; it is a planning-level estimate for nationwide comparison, not a flood-zone map and not a substitute for a local risk assessment or the risk to one home. Declarations are presidential disaster, emergency and fire management declarations that named this county; state declarations and SBA or USDA designations are not included. Tornadoes are counted when the county is one of up to four listed on the track; 670 tornadoes that crossed a state line carry no county list in NOAA's file and are left out.
Federal Emergency Management Agency (FEMA), National Risk Index Dataset: National Risk Index Counties - v1.20.0 (December 2025). Retrieved from https://services.arcgis.com/XG15cJAlne2vxtgt/ArcGIS/rest/services/National_Risk_Index_Counties/FeatureServer/0/query on November 2, 2026, 1:20 PM EST. This product uses the Federal Emergency Management Agency’s National Risk Index dataset API or downloadable datasets 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).
Federal Emergency Management Agency (FEMA), OpenFEMA Dataset: Disaster Declarations Summaries - v2, retrieved from https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries on November 2, 2026, 1:21 PM EST. 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).
Tornado records: NOAA/NWS Storm Prediction Center, Severe Weather Database, tornadoes 1950–2025 (https://www.spc.noaa.gov/wcm/data/1950-2025_actual_tornadoes.csv, downloaded 2 November 2026). Public domain; not endorsed by NOAA. Compiled by Global Incident Tracker.
Questions about Plymouth County
What natural disasters is Plymouth County, Massachusetts most at risk from?
Plymouth County, Massachusetts has a Relatively Moderate natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 90.4 out of 100, higher than about 90% of US counties, with coastal flooding, inland (river and flash) flooding and strong winds scoring highest of its 18 hazards and $114 million a year in expected losses.
How many federal disaster declarations has Plymouth County had?
OpenFEMA lists 30 federal disaster declarations that included Plymouth County since 1972, not counting 2 for COVID-19; the latest is EM-3599-MA (Hurricane Lee, declared 15 September 2023). Another 6 Massachusetts declarations were made statewide without a county list.
How many tornadoes have hit Plymouth County?
NOAA's Storm Prediction Center recorded 11 tornadoes touching Plymouth County from 1950 to 2025. The deadliest: 7 Sep 1958, F0, 0.1 mi path, 1 killed, 1 injured (deaths and injuries are for the whole path).
Is the National Risk Index a flood zone map?
No. The National Risk Index is a planning-level estimate for a whole county, built for nationwide comparison. It does not tell you the flood zone or the risk of a single property: for that, look up the address on FEMA's Flood Map Service Center (msc.fema.gov) and ask your local floodplain manager.