Winneshiek County, Iowa

What hazards hit Winneshiek County most?

The most frequent records are severe thunderstorm wind events: 166 since 1955. 52% of its severe thunderstorm wind events since 1955 fell in June and July. The rank column places the county among Iowa's counties by days with a record per 1,000 square miles of land over each hazard's complete period.

Source: NOAA NCEI Storm Events Database (county and forecast-zone records attributed to the county; a zone record shows its own totals on each county it covers). Days: dates with at least one record of the hazard in the county. Ranks: days with a record per 1,000 square miles of land (Census Bureau 2024 Gazetteer), since 1950 for tornadoes, 1955 for hail and thunderstorm wind, 1996 for the rest.

How many tornadoes has Winneshiek County had?

NOAA records 23 tornadoes in Winneshiek County from 1957 to 2024, the strongest rated F4, with 0 deaths and 2 injuries recorded in the county. A tornado that crossed a county line is counted in each county it touched, with the length of its path inside the county.

Counted as whole tornadoes rather than county records, the Storm Prediction Center's database holds 24 tornadoes whose track touched Winneshiek County since 1950 (NOAA's county records number 23: they file a crossing tornado once per county segment, and the two databases differ on some tracks); along their whole tracks they killed 0 people.

Map of the strongest tornado tracks in Iowa.

Source: NOAA NCEI Storm Events Database, tornado records by county (path length in the county, maximum width); ratings as published: F scale before February 1, 2007, EF scale after. Whole-track figures: NOAA Storm Prediction Center tornado database (1950-2025). SPC severe weather database.

When was the last damaging storm in Winneshiek County?

The most recent record with damage, injuries or deaths is the August 18, 2025 flash flood ($20,000 in damage in 2025 dollars).

Source: NOAA NCEI Storm Events Database; every record of 2025-2026 is listed, earlier ones when they caused deaths, injuries or $250,000 of damage (2025 dollars), and every tornado.

The deadliest and costliest records

A damage figure marked "step" is a record from before 1993: NOAA then filed damage by category, and the figure is the category as entered, in the dollars of that year, not an estimate of the loss.

Source: NOAA NCEI Storm Events Database: deaths and injuries direct and indirect; damage is property plus crops as estimated by the National Weather Service, converted to 2025 dollars.

Is it getting more frequent?

Records per decade for Winneshiek County's most frequent hazards. Counts rose everywhere after 1996, when NOAA began recording every event type, so compare decades within a hazard's complete period only (the shaded cells come before it).

Source: NOAA NCEI Storm Events Database, records per calendar decade; zone records from the CZ_TYPE field (Z).

What time of year?

52% of its severe thunderstorm wind events since 1955 fell in June and July. The two busiest months are in violet.

Source: NOAA NCEI Storm Events Database, records by the month they began.

Federal disaster declarations for Winneshiek County

FEMA's register lists 21 declarations that include Winneshiek County: 19 major disasters, 2 emergencies and 0 fire management assistance declarations. Most were for severe storm (9) and flood (9).

Source: FEMA OpenFEMA Disaster Declarations Summaries (v2), declarations through October 2, 2026; one declaration is counted once however many areas it names. OpenFEMA dataset page.

How many floods has Winneshiek County had?

NOAA's Storm Events Database holds 65 flood or flash flood records for Winneshiek County from 1998 to 2025, on 44 days, with 0 deaths. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Winneshiek County ranks 1887th of 2,942 U.S. counties.

The National Flood Insurance Program has paid $365,000 on 31 claims filed in Winneshiek County; the most in one year was 24 in 2016. Claims count insured losses only: uninsured flood damage is not in this file.

Source: FEMA OpenFEMA NFIP Redacted Claims, as of September 8, 2026; claims by year of loss, payments in the dollars of the year paid. OpenFEMA dataset page.

FEMA's modeled risk for Winneshiek County

FEMA's National Risk Index rates Winneshiek County Very Low overall, with an expected annual loss of $15.2 million. These are FEMA's model estimates of future loss from 18 hazards, not a count of what happened; they can differ from the record above.

Source: FEMA National Risk Index, county table, December 2025 release. FEMA's National Risk Index map.

Counties that share a border with Winneshiek County

1. Clayton County 716
2. Fillmore County, MN 688
3. Fayette County 634
4. Winneshiek County 627
5. Chickasaw County 495
6. Howard County 493
7. Allamakee County 469
8. Houston County, MN 422

Source: U.S. Census Bureau county adjacency file; NOAA NCEI Storm Events Database, records since 1950. The Census Bureau's adjacency file.

Next

• Tornadoes in IowaEvery Iowa tornado since 1950 and the counties with the most per square mile
• Severe thunderstorm wind in IowaThe state's severe thunderstorm wind events, by county, year and month
• The Iowa recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in Winneshiek CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download Winneshiek County's FEMA declarations (CSV)21 rows: every declaration that named the county, for your own analysis