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Tornado in Boone County, Illinois
25 tornadoes events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Tornado.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. Storm records through 30 Jun 2026.
NCEI records 25 tornado events in Boone County, Illinois, between 1950 and 2026, spread over 15 years.
April is the busiest month, with 9 of the recorded events. The last 20 years account for 20 events against 1 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.7% of the 3,647 tornado events recorded in Illinois; its 8.9 per 100 square miles compares with 6.6 statewide.
NCEI attributes 25 deaths in the county to tornadoes.
By rating: 10 at (E)F0, 11 at (E)F1, 1 at (E)F2, 1 at (E)F3, 1 at (E)F4, 0 at (E)F5 and 1 unrated. Tornadoes before 2007 carry the original Fujita rating.
Compared with Illinois
| Measure | Boone County | Illinois | US |
|---|---|---|---|
| Tornado events since 1950 | 25 | 3,647 | 81,281 |
| Per 100 square miles | 8.9 | 6.6 | 2.3 |
| Per 10,000 residents | 4.7 | 2.9 | 2.4 |
| Deaths recorded | 25 | 236 | 6,410 |
| Busiest month | April | April | May |
By year
Seasonality
1Feb
0Mar
2Apr
9May
3Jun
5Jul
2Aug
1Sep
1Oct
0Nov
1Dec
0
Magnitude distribution
Enhanced Fujita scale wind estimates
- EF0/F0
- 65–85 mph (EF0)
- EF1/F1
- 86–110 mph (EF1)
- EF2/F2
- 111–135 mph (EF2)
- EF3/F3
- 136–165 mph (EF3)
- EF4/F4
- 166–200 mph (EF4)
- EF5/F5
- over 200 mph (EF5)
- Unrated
- no rating recorded
Tornado rating as recorded (Fujita scale before February 2007, Enhanced Fujita after).
Recorded events
All 25 events, most recent first. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 3 Jun 2025 | Tornado | EF0 | — | — | — | — | County |
| 7 May 2024 | Tornado | EF0 | — | — | — | — | County |
| 12 Jul 2023 | Tornado | EF0 | — | — | — | — | County |
| 31 Mar 2023 | Tornado | EF1 | — | — | — | — | County |
| 31 Mar 2023 | Tornado | EF1 | — | — | 1 | 40 | County |
| 30 Apr 2022 | Tornado | EF0 | — | — | — | — | County |
| 30 Apr 2022 | Tornado | EF unrated | — | — | — | — | County |
| 10 Aug 2020 | Tornado | EF1 | — | — | — | — | County |
| 28 Jun 2017 | Tornado | EF1 | — | — | — | — | County |
| 28 Jun 2017 | Tornado | EF1 | — | — | — | — | County |
| 17 May 2017 | Tornado | EF1 | $100K | — | — | — | County |
| 9 Apr 2015 | Tornado | EF1 | $75K | — | — | — | County |
| 9 Apr 2015 | Tornado | EF0 | $20K | — | — | — | County |
| 9 Apr 2015 | Tornado | EF1 | $150K | — | — | — | County |
| 9 Apr 2015 | Tornado | EF0 | — | — | — | — | County |
| 9 Apr 2015 | Tornado | EF0 | — | — | — | — | County |
| 22 Nov 2010 | Tornado | EF2 | $4.5M | — | — | — | County |
| 30 Jul 2009 | Tornado | EF0 | — | — | — | — | County |
| 12 Jun 2008 | Tornado | EF1 | $25K | — | — | — | County |
| 7 Jan 2008 | Tornado | EF3 | $2.0M | — | — | 4 | County |
| 29 Apr 1991 | Tornado | F0 | $25K | — | — | — | County |
| 15 May 1986 | Tornado | F0 | $3K | — | — | — | County |
| 22 Jun 1984 | Tornado | F1 | $25K | — | — | — | County |
| 21 Apr 1967 | Tornado | F4 | $250K | — | 24 | 410 | County |
| 26 Sep 1959 | Tornado | F1 | $25K | — | — | — | County |
Questions and answers
How many tornado events has Boone County had?
25 events in the NCEI Storm Events record between 1950 and 2026. Reporting of tornadoes became far more complete after 1996, so early decades undercount.
When was the last recorded tornado event in Boone County?
3 Jun 2025 (Tornado, EF0). Records reach NCEI about 120 days after the month ends.
What was the most damaging tornado event recorded in Boone County?
The tornado of 22 Nov 2010, with property damage estimated by NCEI at $4.5M.
How does Boone County compare with Illinois for tornado?
8.9 events per 100 square miles against 6.6 statewide; the county holds 25 of the state's 3,647 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Tornado hub and the county page.