Fond du Lac County, Wisconsin: Natural Disaster Risk and History
Fond du Lac County, Wisconsin has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 76.3 out of 100, higher than about 76% of US counties, with hail, cold waves and tornadoes scoring highest of its 18 hazards and $44 million a year in expected losses.
OpenFEMA lists 10 federal disaster declarations that included Fond du Lac County since 1974, not counting 2 for COVID-19; the latest is DR-4402-WI (Severe Storms, Tornadoes, Straight-Line Winds, Flooding, and Landslides, declared 18 October 2018). NOAA's Storm Prediction Center recorded 58 tornadoes touching Fond du Lac County from 1950 to 2025.
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Population 104,053 Buildings worth $35 billion Area 774 sq mi Risk rank in Wisconsin 16 of 72 FIPS 55039
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Hail | Relatively Moderate | 93.7 | $3.0 million | about 3.3 a year | 124 |
| Cold wave | Relatively High | 90.9 | $9.7 million | about 5.8 a year | 111 |
| Tornado | Relatively Moderate | 88.5 | $8.0 million | about once every 2.0 years | 48 |
| Strong wind | Relatively High | 85.3 | $2.0 million | about 3.4 a year | 128 |
| Inland flooding | Relatively Moderate | 74.3 | $19 million | about once every 1.6 years | 18 |
| Heat wave | Relatively Low | 71.4 | $1.2 million | about 2.5 a year | 40 |
| Winter weather | Relatively Moderate | 68.1 | $149,987 | about 15 a year | 286 |
| Lightning | Relatively Moderate | 62.3 | $448,582 | about 34 a year | 129,180 strikes |
| Landslide | Very Low | 55.3 | $2,409 | about once every 8.5 years | — |
| Wildfire | Very Low | 50.7 | $61,291 | rarer than once in 1,000 years | — |
| Earthquake | Very Low | 35.0 | $138,201 | rarer than once in 1,000 years | — |
| Ice storm | Relatively Low | 29.6 | $38,470 | about once every 4.2 years | 17 |
| Drought | Very Low | 23.3 | $10,941 | about once every 3.9 years | 63 |
| Hurricane | Very Low | 20.7 | $7,877 | about once every 100 years | 0 |
| Avalanche | Not Applicable | — | — | — | — |
| Coastal flooding | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| 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 10
Most common: Flood 4, Severe Storm 3, Hurricane 1, Drought 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 1970s | 3 | Drought, Flood, Tornado |
| 1980s | 1 | Flood |
| 1990s | 2 | Flood, Severe Storm |
| 2000s | 3 | Severe Storm ×2, Hurricane |
| 2010s | 1 | Flood |
The last 10
Widest declarations that included Fond du Lac County
- Hurricane Katrina Evacuation (2005, EM-3249-WI): 72 Wisconsin counties designated.
- Drought (1976, EM-3014-WI): 66 Wisconsin counties designated.
- Severe Storms, Tornadoes & Flooding (1993, DR-994-WI): 47 Wisconsin counties designated.
Named storms in its declarations: Hurricane Katrina (2005).
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. Wisconsin also had 1 statewide declaration with no county list.
Tornado record since 1950 58
| Tornadoes touching the county | 58 |
|---|---|
| Strongest-rated | (E)F5 ×1 |
| Peak month | August (17) |
| Deadliest | 21 Apr 1974, F3, 58.6 mi path, 2 killed, 18 injured |
| Longest path | 5 Jun 1977, F3, 69.5 mi path, 0 killed, 8 injured |
| Most recent | 28 Aug 2018, EF1, 4.6 mi path |
| Deaths / injuries on those paths | 4 / 80 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 18 | 22 | 11 | 5 | 1 | 1 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 1 | 8 | 7 | 8 | 8 | 11 | 15 | 0 |
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 Fond du Lac County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Fond du Lac County (this page) | — | Relatively Low | 76.3 | Hail |
| Winnebago County | 37 km | Relatively Moderate | 86.8 | Cold wave |
| Dodge County | 41 km | Relatively Low | 69.9 | Hail |
| Calumet County | 42 km | Very Low | 30.2 | Hail |
| Sheboygan County | 44 km | Relatively Low | 70.2 | Hail |
| Green Lake County | 45 km | Relatively Low | 58.0 | Hail |
Nearest by distance between county centres. Every county in Wisconsin, ranked.
Vulnerability and resilience
| Social vulnerability | Very Low 16.6 |
|---|---|
| Community resilience | Very High 94.1 |
| Community risk factor | 0.85 |
| Expected annual loss, all hazards | $44 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 Fond du Lac County's main hazards
- Right now: National Weather Service alerts for Wisconsin · all official warnings on Global Incident Tracker.
- Hail: Weather alerts for Wisconsin
- Cold wave: Carbon monoxide in winter · Power outages now
- Tornado: Is there a tornado warning 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 Fond du Lac County
What natural disasters is Fond du Lac County, Wisconsin most at risk from?
Fond du Lac County, Wisconsin has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 76.3 out of 100, higher than about 76% of US counties, with hail, cold waves and tornadoes scoring highest of its 18 hazards and $44 million a year in expected losses.
How many federal disaster declarations has Fond du Lac County had?
OpenFEMA lists 10 federal disaster declarations that included Fond du Lac County since 1974, not counting 2 for COVID-19; the latest is DR-4402-WI (Severe Storms, Tornadoes, Straight-Line Winds, Flooding, and Landslides, declared 18 October 2018). Another 1 Wisconsin declarations were made statewide without a county list.
How many tornadoes have hit Fond du Lac County?
NOAA's Storm Prediction Center recorded 58 tornadoes touching Fond du Lac County from 1950 to 2025. The deadliest: 21 Apr 1974, F3, 58.6 mi path, 2 killed, 18 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.