Boone County, Illinois tornadoes

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25 confirmed tornadoes since NOAA records began in 1950 (the first here in 1958). Most recent: June 3, 2025, EF0. 2026 so far: 0 preliminary reports preliminary

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Every tornado path in the county

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(E)F0(E)F1(E)F2(E)F3(E)F4(E)F5Unrated

Each path is a straight line from where the tornado started to where it ended, which is all most NOAA records hold. Tap a path for its details.

At a glance

Total251950 to 2025
Per year0.3average since 1950
Peak monthApril9 of 25
StrongestF4Apr 21, 1967
Deaths28whole paths, see note
Injuries512whole paths, see note

Deaths and injuries are NOAA's totals for each tornado's whole path, which can extend beyond Boone County.

When tornadoes hit here

By month

90 Jan: 1Feb: 0Mar: 2Apr: 9May: 3Jun: 4Jul: 2Aug: 1Sep: 1Oct: 1Nov: 1Dec: 0JanFebMarAprMayJunJulAugSepOctNovDec

April is the peak month, with 9 of 25 tornadoes.

By time of day

60 12 AM: 0: 0: 03 AM: 0: 0: 06 AM: 0: 0: 09 AM: 0: 0: 012 PM: 1: 2: 13 PM: 4: 2: 46 PM: 6: 1: 19 PM: 1: 0: 212 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM

Most often around 6:00 PM. Times as recorded by NOAA, mostly Central Standard Time.

By year, 1950 to 2025

50 1950: 0: 0: 0: 0: 0: 0: 0: 0: 1: 11960: 0: 0: 0: 0: 0: 0: 0: 1: 0: 01970: 0: 0: 0: 0: 0: 0: 0: 0: 0: 01980: 0: 0: 0: 0: 1: 0: 1: 0: 0: 01990: 0: 1: 0: 0: 0: 0: 0: 0: 0: 02000: 0: 0: 0: 0: 0: 0: 0: 0: 2: 12010: 1: 0: 0: 0: 0: 5: 0: 2: 0: 02020: 1: 0: 2: 3: 1: 119501960197019801990200020102020

The line is the five-year average. Tornadoes before about 1953 were under-reported, and better radar since the 1990s finds more weak ones.

By rating

EF0
9
EF1
10
EF2
2
EF3
1
EF4
2
Unknown
1

Ratings before February 2007 use the original F scale; the numbers line up with today's EF scale. Unknown means NOAA could not assign a rating.

Notable tornadoes

Deadliest

F4, April 21, 1967

24 deaths, 450 injuries Strongest

F4, April 21, 1967

25.5 mile path Longest path

81 miles, F2

October 8, 1958, whole path Widest

1,200 yards, F4

April 21, 1967

All 25 tornadoes, newest first

DateRatingPath lengthWidthDeathsInjuries
Jun 3, 2025EF00.31 mi75 yd00
May 7, 2024EF014.33 mi50 yd00
Jul 12, 2023EF02.46 mi175 yd00
Mar 31, 2023EF117.32 mi300 yd00
Mar 31, 2023EF127.51 mi600 yd140
Apr 30, 2022EFU0.12 mi30 yd00
Apr 30, 2022EF00.5 mi60 yd00
Aug 10, 2020EF19.18 mi300 yd00
Jun 28, 2017EF15.9 mi200 yd00
May 17, 2017EF110.3 mi100 yd00
Apr 9, 2015EF13.92 mi50 yd00
Apr 9, 2015EF00.42 mi30 yd00
Apr 9, 2015EF14.01 mi100 yd00
Apr 9, 2015EF430.14 mi700 yd211
Apr 9, 2015EF02.84 mi25 yd00
Nov 22, 2010EF218.1 mi200 yd06
Jul 30, 2009EF00.25 mi20 yd00
Jun 12, 2008EF16.2 mi150 yd00
Jan 7, 2008EF313.1 mi100 yd05
Apr 29, 1991F03 mi100 yd00
May 15, 1986F00.2 mi10 yd00
Jun 22, 1984F10.6 mi200 yd00
Apr 21, 1967F425.5 mi1,200 yd24450
Sep 26, 1959F13 mi10 yd00
Oct 8, 1958F281 mi10 yd10

Nearby counties

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Source: NOAA Storm Prediction Center severe weather database, 1950 to 2025, and SPC preliminary reports for 2026. Page built October 12, 2026.