Chisago County, Minnesota tornadoes

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20 confirmed tornadoes since NOAA records began in 1950 (the first here in 1954). Most recent: July 18, 2020, 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

Total201950 to 2025
Per year0.3average since 1950
Peak monthJuly10 of 20
StrongestF4May 21, 1957
Deaths0whole paths, see note
Injuries4whole paths, see note

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

When tornadoes hit here

By month

100 Jan: 0Feb: 0Mar: 0Apr: 0May: 4Jun: 5Jul: 10Aug: 1Sep: 0Oct: 0Nov: 0Dec: 0JanFebMarAprMayJunJulAugSepOctNovDec

July is the peak month, with 10 of 20 tornadoes.

By time of day

40 12 AM: 1: 2: 13 AM: 0: 0: 06 AM: 0: 1: 09 AM: 0: 0: 312 PM: 0: 1: 03 PM: 4: 0: 16 PM: 1: 3: 19 PM: 0: 0: 112 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM

Most often around 3:00 PM. Times as recorded by NOAA, mostly Central Standard Time.

By year, 1950 to 2025

30 1950: 0: 0: 0: 0: 1: 0: 0: 1: 0: 01960: 0: 0: 1: 0: 0: 0: 1: 0: 0: 01970: 0: 0: 0: 0: 0: 0: 0: 0: 0: 01980: 0: 0: 0: 0: 0: 0: 0: 1: 0: 01990: 0: 0: 0: 0: 1: 1: 0: 0: 0: 32000: 0: 0: 0: 1: 1: 1: 0: 0: 0: 12010: 1: 0: 0: 1: 0: 0: 0: 2: 0: 12020: 1: 0: 0: 0: 0: 019501960197019801990200020102020

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
14
EF1
4
EF2
1
EF4
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

Strongest

F4, May 21, 1957

9.2 mile path Longest path

12.64 miles, EF0

July 12, 2017, whole path Widest

880 yards, F1

June 17, 1954

All 20 tornadoes, newest first

DateRatingPath lengthWidthDeathsInjuries
Jul 18, 2020EF01.26 mi75 yd00
Jul 28, 2019EF18.16 mi440 yd00
Jul 12, 2017EF00.55 mi200 yd00
Jul 12, 2017EF012.64 mi440 yd00
Jun 21, 2013EF00.5 mi50 yd00
Jun 17, 2010EF27.82 mi400 yd02
Aug 19, 2009EF00.9 mi200 yd00
Jun 11, 2005F00.1 mi20 yd00
May 30, 2004F00.3 mi25 yd00
Jun 24, 2003F00.3 mi25 yd00
Jul 9, 1999F00.2 min/a00
Jul 9, 1999F00.5 min/a00
Jul 9, 1999F00.5 min/a00
Jul 21, 1995F16 mi300 yd00
May 30, 1994F01.5 mi90 yd00
Jul 20, 1987F00.1 mi10 yd00
Jul 10, 1966F00.1 mi10 yd00
May 18, 1962F12 mi150 yd00
May 21, 1957F49.2 mi100 yd02
Jun 17, 1954F13.8 mi880 yd00

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.