Green Bay, Wisconsin: natural disaster risk
How exposed Green Bay is to floods, storms and other hazards, from FEMA and NOAA records for Brown County.
Green Bay is a city of 106,253 people in Brown County, Wisconsin. FEMA's National Risk Index rates Brown County relatively moderate for natural hazards overall, about average for the US. The costliest hazards there are inland flooding, cold wave and tornado, with about $104 million in expected losses a year across the county. The weather service has logged 402 storm reports in the county since 1956, including 30 tornadoes and 25 floods. About 0.6% of homes in the county carry federal flood insurance.
Risk figures are for Brown County. FEMA National Risk Index December 2025; NOAA Storm Events; US Census Bureau ACS 2020 to 2024. Updated November 6, 2026.
Top risks in Green Bay
Full Brown County report ›- Check the FEMA flood map for your address, and ask the seller or landlord about past flooding.
- Price a flood policy now. Most new federal policies take 30 days to start.
- Insulate pipes in outside walls, crawl spaces and garages.
- Know how to shut off the main water valve.
- Pick a shelter spot: a basement, or an inside room on the lowest floor with no windows.
- Turn on emergency alerts on your phone and keep a weather radio.
All hazards
| Hazard | Rating | A year |
|---|---|---|
| Inland flooding | $57M | |
| Cold wave | $25M | |
| Tornado | $12M | |
| Hail | $4M | |
| Lightning | $2M | |
| Heat wave | $1M | |
| Strong wind | $367K | |
| Winter weather | $313K | |
| Earthquake | $139K | |
| Ice storm | $95K | |
| Coastal flooding | $69K | |
| Wildfire | $22K |
Homes in Green Bay
Older homes and mobile homes usually take more damage in storms, floods and earthquakes. Ask about roof age, flood history and retrofits before you buy or rent.
Strongest tornadoes in Brown County
More cities in Brown County
Other cities in Wisconsin
All ›Common questions about Green Bay
Is Green Bay safe from natural disasters?
Green Bay is in Brown County, which FEMA's National Risk Index rates relatively moderate overall, about average for the US. The biggest hazards are inland flooding, cold wave, tornado. No place is free of risk, so check the flood map and insurance for any home you consider.
What natural disasters happen in Green Bay?
By expected yearly losses in Brown County, the top hazards are inland flooding (Moderate), cold wave (High), tornado (High). Brown County has been part of 7 federal disaster or emergency declarations for natural events.
Does Green Bay get tornadoes?
Yes. NOAA records list 30 tornadoes in Brown County since 1950; the strongest was an F2 tornado on May 10, 1959. FEMA rates tornado risk in the county high.
Do I need flood insurance in Green Bay?
Standard home insurance does not cover floods. In Brown County, about 0.6% of homes have federal flood insurance, and FEMA rates inland flooding risk moderate. Check the FEMA flood map for your address and get a quote even outside a high-risk zone.