Tornadoes in Boone County
The Storm Prediction Center records 26 tornadoes whose paths touched Boone County, Illinois between 1958 and 2025. They killed 28 people and injured 512. The busiest month is April, with 9 tornadoes. The strongest was an F4 on 21 April 1967. The most recent was on 3 June 2025.
- 26tornadoes
- 28deaths
- 512injuries
- 926per 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 Boone County?
| Rating | Tornadoes | Share |
|---|---|---|
| F0 / EF0 | 9 | 35% |
| F1 / EF1 | 11 | 42% |
| F2 / EF2 | 2 | 8% |
| F3 / EF3 | 1 | 4% |
| F4 / EF4 | 2 | 8% |
| F5 / EF5 | 0 | 0% |
| Unknown rating | 1 | 4% |
Boone 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 | 2 |
| 1960s | 1 |
| 1980s | 2 |
| 1990s | 1 |
| 2000s | 3 |
| 2010s | 9 |
| 2020s | 8 |
Show the numbers
| Period | Count |
|---|---|
| Jan | 1 |
| Feb | 0 |
| Mar | 2 |
| Apr | 9 |
| May | 3 |
| Jun | 5 |
| Jul | 2 |
| Aug | 1 |
| Sep | 1 |
| Oct | 1 |
| Nov | 1 |
| Dec | 0 |
Records for Boone County
- Deadliest and Strongest: Woodstock, Illinois tornado21 April 1967, F4, 24 deaths, 450 injuries, 25.5 miles long
- Longest path: Illinois tornado8 October 1958, F2, 1 death, 81 miles long
- Most recent: Illinois tornado3 June 2025, EF0, 0.3 miles long
Notable tornadoes in Boone County
- Woodstock, Illinois tornado21 April 1967, F4, 24 deaths, 450 injuries, 25.5 miles long
- Franklin Grove, Illinois tornado9 April 2015, EF4, 2 deaths, 11 injuries, 30.1 miles long
Many of these tornadoes killed or injured people. The numbers are the official record's, and they may be revised.