Tornadoes in Cook County
The Storm Prediction Center records 92 tornadoes whose paths touched Cook County, Illinois between 1954 and 2025. They killed 41 people and injured 916. The busiest month is July, with 23 tornadoes. The strongest was an F4 on 21 April 1967. The most recent was on 19 March 2025.
- 92tornadoes
- 41deaths
- 916injuries
- 974per 10,000 sq mi of land
A tornado that crossed several counties counts in each one, so county counts add up to more than the state's.
How strong were the tornadoes in Cook County?
| Rating | Tornadoes | Share |
|---|---|---|
| F0 / EF0 | 40 | 43% |
| F1 / EF1 | 32 | 35% |
| F2 / EF2 | 16 | 17% |
| F3 / EF3 | 2 | 2% |
| F4 / EF4 | 2 | 2% |
| F5 / EF5 | 0 | 0% |
| Unknown rating | 0 | 0% |
Cook County tornadoes over time
The 2020s only run to 2025, so that bar is for a shorter period. The record starts in 1950.
Show the numbers
| Period | Count |
|---|---|
| 1950s | 9 |
| 1960s | 12 |
| 1970s | 17 |
| 1980s | 7 |
| 1990s | 2 |
| 2000s | 7 |
| 2010s | 8 |
| 2020s | 30 |
Show the numbers
| Period | Count |
|---|---|
| Jan | 0 |
| Feb | 3 |
| Mar | 5 |
| Apr | 9 |
| May | 12 |
| Jun | 20 |
| Jul | 23 |
| Aug | 10 |
| Sep | 8 |
| Oct | 1 |
| Nov | 1 |
| Dec | 0 |
Records for Cook County
- Deadliest and Strongest: Orland Park, Illinois tornado21 April 1967, F4, 33 deaths, 500 injuries, 15 miles long
- Longest path: Illinois tornado12 November 1965, F2, 2 deaths, 90 injuries, 35.9 miles long
- Most recent: Illinois tornado19 March 2025, EF0, 0.3 miles long
Notable tornadoes in Cook County
- Orland Park, Illinois tornado21 April 1967, F4, 33 deaths, 500 injuries, 15 miles long
- Bolingbrook, Illinois tornado13 June 1976, F4, 2 deaths, 23 injuries, 3.3 miles long
Many of these tornadoes killed or injured people. The numbers are the official record's, and they may be revised.