Natural hazards · Green Grass

Green Grass, SD natural hazards

Most of the natural-hazard damage FEMA expects in Green Grass comes from cold waves, and overall the risk is moderate for a U.S. community.

FEMA National Risk Index, December 2025 · OpenFEMA claims, aid & declarations

Expected damage

How exposed is Green Grass?

Moderate

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Green Grass to be higher than in 55% of U.S. communities, mostly from cold waves.

Cold waves84%Inland flooding9%Everything else7%

By hazard

What Green Grass faces

Each hazard’s share of the damage FEMA expects here, and how that compares with the rest of the country.

Cold waves

84% of expected damage

Above average · higher than 66% of U.S. places

Recorded about 9 times a year in the area

Inland flooding

9% of expected damage

Above average · higher than 57% of U.S. places

Recorded about once a year in the area

Lower here

TornadoesHailIce stormsWinter weatherHeat wavesWildfireEarthquakesLandslidesStrong windLightningDrought

Not a risk here

Coastal floodingHurricanesAvalanchesTsunamisVolcanic activity

Flood risk changes street by street. Check a specific address on FEMA’s flood map, and ask about flood insurance before you buy.

Flood insurance claims

Does Green Grass flood?

FEMA's records show no paid flood insurance claims in Green Grass.

Disasters that hit Green Grass

Federal disasters declared here

None of the disasters declared for Dewey County shows FEMA aid or repair money reaching Green Grass itself in FEMA’s records.

Brought FEMA money into Green GrassDeclared for Dewey County only

Dewey County has had 14 natural disasters declared since 1953, most often severe storms and floods.

About these numbers

How to read this page

An average, not a forecastFEMA’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 here, so a big city isn’t rated riskier just for having more buildings. Green Grass is smaller than a census tract, so it shares the figures of the tract around its center.

Money that reached townFlood claims are matched to Green Grass’s own flood-insurance community; household aid to the registrant’s city; repair grants to Green Grass. FEMA’s model follows property values, so a place that recently lost many homes can rate lower than it feels.

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.