Green Harbor’s biggest natural hazard is coastal flooding
Most of the natural-hazard damage FEMA expects in Green Harbor comes from coastal flooding, and overall the risk is moderate for a U.S. community.
What stands out about Green Harbor’s weather risks
Read from FEMA’s records below. The page puts what stands out first.
What Green Harbor faces
Each hazard’s share of the damage FEMA expects here, and how it compares with the rest of the country.
Coastal flooding
Inland flooding
Hurricanes
How exposed is Green Harbor?
FEMA expects yearly storm and flood damage to homes and buildings here to be higher than in 56% of U.S. communities, mostly from coastal flooding and inland flooding.
Rated higher than 301 of the 351 Massachusetts towns we cover.
Green Harbor is smaller than a census tract, so it shares the figures of the tract around its center.
Does Green Harbor flood? No paid flood claims on record
FEMA’s records show no paid flood insurance claims in Green Harbor. That’s not a promise: most homes don’t carry flood insurance, so small floods go unrecorded.
Green Harbor isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Plymouth County.Federal disasters declared here
None of the disasters declared for Plymouth County shows FEMA aid or repair money reaching Green Harbor itself in FEMA’s records.
Plymouth County has had 26 natural disasters declared since 1953, most often hurricanes and severe storms.
Get ready for what Green Harbor actually faces
A short kit for its top hazards, what to check before you buy, and where neighbors get alerts.
- Know your evacuation zone and the way off the coast.
- Storm surge comes fast: leave when you’re told, not when the water arrives.
- Move cars to high ground before king tides and nor’easters.
- Turn around at flooded roads: a foot of moving water can carry off a car.
- Flood insurance usually takes 30 days to start, so buy it before the forecast.
- Keep papers and medicines up high, in a grab-and-go bag.
- The season runs June through November and peaks from mid-August to mid-October.
- Bring in porch furniture and anything the wind can throw.
- Fill the gas tank and charge phones before the storm arrives.
- Look up the address on FEMA’s flood map.
- Ask the seller or landlord whether it has ever flooded, and what flood insurance costs there.
- Get a flood insurance quote early: policies usually start 30 days after you buy.
Know where neighbors sign up for alerts? Add it to the Handbook so everyone has it.
Green Harbor and its neighbors
Green Harbor has the highest rating of the 3 towns around it. Tap a town to see its hazards.
| Town | Rating | Mostly | Flood claims |
|---|---|---|---|
| Green Harbor | Moderate | coastal flooding | 0 |
| Marshfield | Moderate | inland flooding | 1,466 |
| Duxbury | Low | inland flooding | 396 |
Rating = expected yearly storm and flood damage as a share of what’s there, vs. U.S. communities. Flood claims = paid federal flood insurance claims on record.
Most disasters here begin in January–March
The month each of Plymouth County’s 26 declared disasters began, since 1953.
What these numbers can and can’t tell you
- An average, not a forecast. FEMA’s National Risk Index estimates the damage 18 kinds of natural hazards cause in a typical year, from decades of records and models. A quiet decade can follow a bad year.
- Compared by rate. “Higher than N%” compares yearly damage as a share of what’s there, so a big city isn’t rated riskier just for having more buildings.
- Money that reached town. Flood claims are matched to Green Harbor’s own flood-insurance community; household aid to the registrant’s city; repair grants to Green Harbor.
- It follows property value. FEMA’s model weighs damage to buildings, so a place that recently lost many homes can rate lower than it feels.
Storm stories
Memories, warnings and help from neighbors in Green Harbor.
Your answer becomes a post in Town Square.
Sources: FEMA National Risk Index (December 2025); OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Census tracts: U.S. Census Bureau. Preparedness tips: Ready.gov. An average of past damage, not a forecast.