St. Croix County, Wisconsin

What hazards hit St. Croix County most?

The most frequent records are hail reports: 182 since 1975. 55% of its hail reports since 1975 fell in May and June. The rank column places the county among Wisconsin'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 St. Croix County had?

NOAA records 34 tornadoes in St. Croix County from 1953 to 2025, the strongest rated F5, with 2 deaths and 35 injuries recorded in the county. That is 19th of 72 Wisconsin 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 34 tornadoes whose track touched St. Croix County since 1950 (NOAA's county records number 34, the same count); along their whole tracks they killed 26 people, 2 of them in St. Croix County.

Map of the strongest tornado tracks in Wisconsin.

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 St. Croix County?

The most recent record with damage, injuries or deaths is the July 24, 2023 thunderstorm wind ($9,685 in damage in 2025 dollars).

The sheriff's office relayed reports of roof damage to an apartment building. A subsequent damage survey noted that part of the roof was blown off the building and estimated wind speeds of 75 to 85 mph. Several hundred trees were either broken or uprooted in North Hudson.
National Weather Service event narrative, NOAA Storm Events Database (search the full record, event 1228216)

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 St. Croix 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?

55% of its hail reports since 1975 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 St. Croix County

FEMA's register lists 11 declarations that include St. Croix County: 8 major disasters, 3 emergencies and 0 fire management assistance declarations. Most were for severe storm (3) and biological (2).

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 St. Croix County had?

NOAA's Storm Events Database holds 19 flood or flash flood records for St. Croix County from 1997 to 2020, on 13 days, with 1 death. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), St. Croix County ranks 1456th of 2,942 U.S. counties.

The National Flood Insurance Program has paid $1.5 million on 74 claims filed in St. Croix County; the most in one year was 18 in 2020. 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 St. Croix County

FEMA's National Risk Index rates St. Croix County Relatively Low overall, with an expected annual loss of $36.0 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 St. Croix County

1. Washington County, MN 593
2. St. Croix County 573
3. Barron County 558
4. Polk County 520
5. Dunn County 504
6. Pierce County 481

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 WisconsinEvery Wisconsin tornado since 1950 and the counties with the most per square mile
• Hail in WisconsinThe state's hail reports, by county, year and month
• The Wisconsin recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in St. Croix CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download St. Croix County's FEMA declarations (CSV)11 rows: every declaration that named the county, for your own analysis