Grant County, South Dakota tornadoes

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22 confirmed tornadoes since NOAA records began in 1950 (the first here in 1955). Most recent: May 6, 2023, 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

Total221950 to 2025
Per year0.3average since 1950
Peak monthMay9 of 22
StrongestF2Aug 28, 1955
Deaths0whole paths, see note
Injuries0whole paths, see note

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

When tornadoes hit here

By month

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

May is the peak month, with 9 of 22 tornadoes.

By time of day

50 12 AM: 0: 0: 03 AM: 0: 0: 06 AM: 0: 1: 09 AM: 0: 0: 012 PM: 0: 4: 23 PM: 0: 2: 56 PM: 3: 2: 29 PM: 1: 0: 012 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM

Most often around 5:00 PM. Times as recorded by NOAA, mostly Central Standard Time.

By year, 1950 to 2025

50 1950: 0: 0: 0: 0: 0: 1: 0: 0: 0: 01960: 0: 0: 1: 0: 0: 0: 0: 0: 1: 01970: 0: 0: 0: 2: 0: 0: 1: 1: 0: 01980: 0: 1: 0: 0: 0: 0: 0: 0: 0: 01990: 0: 0: 0: 0: 0: 0: 5: 0: 2: 02000: 0: 0: 0: 1: 0: 0: 1: 0: 0: 02010: 0: 0: 0: 0: 0: 0: 0: 0: 0: 02020: 0: 0: 4: 1: 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
10
EF1
11
EF2
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

F2, August 28, 1955

1.5 mile path Longest path

10.67 miles, EF1

May 30, 2022, whole path Widest

100 yards, F1

May 23, 1973

All 22 tornadoes, newest first

DateRatingPath lengthWidthDeathsInjuries
May 6, 2023EF00.85 mi10 yd00
May 30, 2022EF14.45 mi20 yd00
May 30, 2022EF110.67 mi40 yd00
May 12, 2022EF11.3 mi10 yd00
May 12, 2022EF10.55 mi20 yd00
Aug 12, 2006F10.3 mi20 yd00
Jun 23, 2003F00.1 mi25 yd00
Jun 26, 1998F00.2 mi30 yd00
Jun 26, 1998F00.4 mi30 yd00
Oct 26, 1996F00.5 mi25 yd00
Oct 26, 1996F00.5 mi25 yd00
Oct 26, 1996F00.5 mi25 yd00
Oct 26, 1996F11 mi75 yd00
May 17, 1996F00.3 mi10 yd00
Aug 3, 1981F10.1 mi10 yd00
May 21, 1977F10.1 mi10 yd00
Jun 24, 1976F01 mi10 yd00
Aug 15, 1973F10.5 mi10 yd00
May 23, 1973F16 mi100 yd00
Jul 12, 1968F00.1 mi10 yd00
May 16, 1962F11 mi10 yd00
Aug 28, 1955F21.5 mi10 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.