Green County, Wisconsin Natural Disaster Risk
FEMA National Risk Index assessment · WI
LowComposite Risk Score
National percentile: 46th
Green County faces low composite natural disaster risk (NRI Risk Index score 46.4, 46th national percentile), driven primarily by hail and landslide exposure. Expected annual loss across all 18 hazard types is $18M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
FEMA's National Risk Index rates Green County at low composite risk, with a National Risk Index score of 46.4 out of 100 — placing it in the 46th national percentile and below the national average for natural-disaster risk. The score blends Expected Annual Loss, Social Vulnerability, and Community Resilience across all 18 FEMA hazard types.
The county's risk is driven primarily by hail (ice stones from severe thunderstorms that damage property and crops) at Medium risk — $2M in expected annual loss and about 3.64 events per year; landslide (downhill movement of rock, soil, and debris on unstable slopes) at Low risk — $34K in expected annual loss and about 0.31 events per year; and cold wave (prolonged spells of dangerously low temperatures) at Medium risk — $5M in expected annual loss and about 5.74 events per year. Across all hazards, FEMA estimates $18M in expected annual loss for a population of 37K.
Beyond physical exposure, Green County has a very low social vulnerability rating (how susceptible the population is to harm) and a very high community resilience rating (its capacity to prepare for and recover from disasters). A less vulnerable population paired with strong resilience helps the community absorb and recover from events.
The federal record bears this out: Green County has received 17 federal disaster declarations since 1969, including 7 for severe storm events and 3 for snowstorm events. The most recent was Covid-19 Pandemic (biological), declared in April 2020.
Among 72 Wisconsin counties, Green County ranks #55 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Hail | Medium | 3.64 / yr | $2M |
| Landslide | Low | 0.31 / yr | $34K |
| Cold Wave | Medium | 5.74 / yr | $5M |
| Tornado | Medium | 0.46 / yr | $3M |
| Strong Wind | Medium | 4.74 / yr | $822K |
| Heat Wave | Low | 3.74 / yr | $509K |
| Riverine Flood | Low | 1.68 / yr | $7M |
| Ice Storm | Low | 0.82 / yr | $72K |
| Drought | Low | 7.22 / yr | $45K |
| Wildfire | Very Low | 0.00 / yr | $18K |
| Winter Weather | Low | 15.11 / yr | $36K |
| Lightning | Low | 38.37 / yr | $130K |
| Earthquake | Very Low | 0.00 / yr | $81K |
| Hurricane | Very Low | 0.01 / yr | $3K |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Disaster History
Green County has received 17 federal disaster declarations since 1969, most recently Covid-19 Pandemic in April 2020. Most frequent causes: Severe Storm (7), Snowstorm (3), Flood (3).
| Declared | Type | Disaster |
|---|---|---|
| April 2020 | Biological | Covid-19 Pandemic |
| March 2020 | Biological | Covid-19 |
| April 2011 | Snowstorm | Severe Winter Storm and Snowstorm |
| June 2008 | Severe Storm | Severe Storms, Tornadoes, and Flooding |
| March 2008 | Snowstorm | Record Snow and Near Record Snow |
| August 2007 | Severe Storm | Severe Storms and Flooding |
| September 2005 | Hurricane | Hurricane Katrina Evacuation |
| June 2004 | Severe Storm | Severe Storms and Flooding |
| January 2001 | Snowstorm | Snow |
| June 2000 | Severe Storm | Severe Storms, Tornadoes, and Flooding |
Showing the 10 most recent of 17 declarations.
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Green County?
Green County has a composite FEMA National Risk Index score of 46.4 out of 100, placing it in the Low category and the 46th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Green County?
The three highest-rated hazards are Hail (Medium, $2M EAL), Landslide (Low, $34K EAL), Cold Wave (Medium, $5M EAL). These account for most of the county's expected annual losses.
How does Green County compare to other Wisconsin counties?
Green County ranks #55 of 72 Wisconsin counties for overall natural disaster risk, with a low rating.
How many federally declared disasters has Green County had?
FEMA records 17 federal disaster declarations for Green County since 1969, most often 7 for severe storm events and 3 for snowstorm events. The most recent was Covid-19 Pandemic, declared in April 2020.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. Green County's $18M EAL is a statistical average, not a guarantee for any specific year or address.