Boone County tornado history

25 tornadoes touched Boone County, Illinois between 1950 and 2025 — about 0.3 a year. The strongest was rated F4 (Apr 21, 1967). Tornadoes here killed 28 and injured 512 people.

25tornadoes since 1950

F4strongest rating

28killed · 512 injured

81 milongest path · 1958

(E)F0(E)F1(E)F2(E)F3(E)F4(E)F5· dots = start point only

By rating

(E)F09

(E)F110

(E)F22

(E)F31

(E)F42

(E)F50

unrated1

By month

JFMAMJJASOND

Peak month: April.

By decade

’50’60’70’80’90’00’10’20

Strongest tornadoes

Date	Rating	Path	Width	Injured	Killed
Apr 21, 1967	F4	25.5 mi	1,200 yd	450	24
Apr 9, 2015	EF4	30.1 mi	700 yd	11	2
Jan 7, 2008	EF3	13.1 mi	100 yd	5	0
Oct 8, 1958	F2	81 mi	10 yd	0	1
Nov 22, 2010	EF2	18.1 mi	200 yd	6	0
Mar 31, 2023	EF1	27.5 mi	600 yd	40	1
Mar 31, 2023	EF1	17.3 mi	300 yd	0	0
May 17, 2017	EF1	10.3 mi	100 yd	0	0
Aug 10, 2020	EF1	9.2 mi	300 yd	0	0
Jun 12, 2008	EF1	6.2 mi	150 yd	0	0
Jun 28, 2017	EF1	5.9 mi	200 yd	0	0
Apr 9, 2015	EF1	4 mi	100 yd	0	0

Most recent tornadoes

Date	Rating	Path	Width	Injured	Killed
Jun 3, 2025	EF0	0.3 mi	75 yd	0	0
May 7, 2024	EF0	14.3 mi	50 yd	0	0
Jul 12, 2023	EF0	2.5 mi	175 yd	0	0
Mar 31, 2023	EF1	27.5 mi	600 yd	40	1
Mar 31, 2023	EF1	17.3 mi	300 yd	0	0
Apr 30, 2022	EF0	0.5 mi	60 yd	0	0
Apr 30, 2022	unrated	0.1 mi	30 yd	0	0
Aug 10, 2020	EF1	9.2 mi	300 yd	0	0
Jun 28, 2017	EF1	5.9 mi	200 yd	0	0
May 17, 2017	EF1	10.3 mi	100 yd	0	0
Apr 9, 2015	EF0	2.8 mi	25 yd	0	0
Apr 9, 2015	EF4	30.1 mi	700 yd	11	2

Deadliest: Apr 21, 1967, F4, 24 killed.

Nearby counties

Winnebago County, IL24 McHenry County, IL30 Rock County, WI36 Walworth County, WI41 DeKalb County, IL30 Ogle County, IL33 Kane County, IL46 Stephenson County, IL21

Questions

How many tornadoes has Boone County, Illinois had?

25 tornadoes touched Boone County, Illinois between 1950 and 2025 in the NOAA Storm Prediction Center database — about 0.3 per year.

What was the strongest tornado in Boone County?

The strongest rating recorded was F4 on Apr 21, 1967, with a 25.5-mile path and 24 deaths.

When is tornado season in Boone County?

Most of its tornadoes happened in April (9 of 25). Tornadoes can occur in any month, so keep alerts on year-round.

Right now: live tornado warnings map · alerts for your location. Dates link to that day’s full storm reports where available (2004 onward).