DeKalb County tornado history

30 tornadoes touched DeKalb County, Illinois between 1950 and 2025 — about 0.4 a year. The strongest was rated EF4 (Apr 9, 2015). Tornadoes here killed 2 and injured 12 people.

30tornadoes since 1950

EF4strongest rating

2killed · 12 injured

74.5 milongest path · 1958

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

By rating

(E)F017

(E)F17

(E)F22

(E)F30

(E)F41

(E)F50

unrated3

By month

JFMAMJJASOND

Peak month: August.

By decade

’50’60’70’80’90’00’10’20

Strongest tornadoes

Date	Rating	Path	Width	Injured	Killed
Apr 9, 2015	EF4	30.1 mi	700 yd	11	2
Aug 15, 1958	F2	74.5 mi	100 yd	0	0
Jun 18, 1975	F2	4.7 mi	27 yd	1	0
Apr 9, 2015	EF1	4 mi	100 yd	0	0
Jun 12, 2013	EF1	2.3 mi	100 yd	0	0
Apr 21, 1967	F1	2 mi	40 yd	0	0
Aug 9, 2021	EF1	1.8 mi	80 yd	0	0
Jun 30, 1977	F1	1.6 mi	90 yd	0	0
Aug 9, 2021	EF1	1.5 mi	150 yd	0	0
Jul 10, 1959	F1	1 mi	60 yd	0	0
Nov 10, 2020	EF0	10 mi	50 yd	0	0
Aug 9, 2021	EF0	6.8 mi	50 yd	0	0

Most recent tornadoes

Date	Rating	Path	Width
Jul 15, 2024	unrated	1.8 mi	50 yd
Jul 14, 2024	EF0	3.4 mi	100 yd
Feb 27, 2024	unrated	1.3 mi	120 yd
Feb 27, 2024	EF0	5.4 mi	175 yd
Jul 28, 2023	EF0	0.8 mi	20 yd
Aug 10, 2021	unrated	0.6 mi	20 yd
Aug 9, 2021	EF0	0.1 mi	20 yd
Aug 9, 2021	EF1	1.8 mi	80 yd
Aug 9, 2021	EF0	6.8 mi	50 yd
Aug 9, 2021	EF1	1.5 mi	150 yd
Aug 9, 2021	EF0	0.2 mi	20 yd
Nov 10, 2020	EF0	10 mi	50 yd

Deadliest: Apr 9, 2015, EF4, 2 killed.

Nearby counties

Kane County, IL46 Kendall County, IL32 Lee County, IL39 Boone County, IL25 Ogle County, IL33 McHenry County, IL30 DuPage County, IL46 Winnebago County, IL24

Questions

How many tornadoes has DeKalb County, Illinois had?

30 tornadoes touched DeKalb County, Illinois between 1950 and 2025 in the NOAA Storm Prediction Center database — about 0.4 per year.

What was the strongest tornado in DeKalb County?

The strongest rating recorded was EF4 on Apr 9, 2015, with a 30.1-mile path and 2 deaths.

When is tornado season in DeKalb County?

Most of its tornadoes happened in August (9 of 30). 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).