Chickasaw County, Iowa

What hazards hit Chickasaw County most?

The most frequent records are hail reports: 111 since 1962. 48% of its hail reports since 1962 fell in May and June. 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 Chickasaw County had?

NOAA records 30 tornadoes in Chickasaw County from 1953 to 2021, the strongest rated F5, with 0 deaths and 3 injuries recorded in the county. That is 38th of 99 Iowa counties by days with tornadoes per 1,000 square miles since 1950. 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 30 tornadoes whose track touched Chickasaw County since 1950 (NOAA's county records number 30, the same count); along their whole tracks they killed 14 people, 0 of them in Chickasaw County.

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 Chickasaw County?

The most recent record with damage, injuries or deaths is the April 14, 2026 hail ($55,000 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 Chickasaw 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?

48% of its hail reports since 1962 fell in May and June. The two busiest months are in violet.

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

Federal disaster declarations for Chickasaw County

FEMA's register lists 19 declarations that include Chickasaw County: 17 major disasters, 2 emergencies and 0 fire management assistance declarations. Most were for severe storm (8) and flood (8).

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 Chickasaw County had?

NOAA's Storm Events Database holds 44 flood or flash flood records for Chickasaw County from 1998 to 2025, on 37 days, with 1 death. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Chickasaw County ranks 1759th of 2,942 U.S. counties.

The National Flood Insurance Program has paid $498,000 on 41 claims filed in Chickasaw County; the most in one year was 8 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 Chickasaw County

FEMA's National Risk Index rates Chickasaw County Very Low overall, with an expected annual loss of $10.9 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 Chickasaw County

1. Butler County 734
2. Fayette County 634
3. Winneshiek County 627
4. Floyd County 621
5. Bremer County 583
6. Chickasaw County 495
7. Howard County 493
8. Mitchell County 484

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
• Hail in IowaThe state's hail reports, 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 Chickasaw CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download Chickasaw County's FEMA declarations (CSV)19 rows: every declaration that named the county, for your own analysis