National Weather Service United States Department of Commerce

A question we are often asked in early spring is "By what date does my town typically get its last frost or freeze?" The charts and maps below will help answer that question for several locations across western South Dakota.

The charts below shows what chance the last frost (36º F) or freeze (32º F or below) will occur by a specific date. For example, in 90% of past years, the temperature at Rapid City last reached 32º F by May 24th. In half of the past years, Rapid City last reached 28ºF by April 28th.

The regional maps farther down show the average date of the first freeze (32º F) and hard freeze (28º F).

A special thanks to South Dakota State Climatologist, Dennis Todey for the data in the charts. More percentiles and locations can be found at South Dakota State University's Climate Page.

Rapid City 36º F 32º F 28º F 24º F
90% June 12 May 24 May 14 May 2
50% May 21 May 9 April 28 April 17
10% May 8 April 20 April 13

April 5

 

Lead 36º F 32º F 28º F 24º F
90% June 22 June 13 May 23 May 15
50% June 4 May 23 May 9 April 29
10% May 19 May 9 April 23

April 14

   

Custer 36º F 32º F 28º F 24º F
90% June 29 June 26 June 13 May 29
50% June 18 June 4 May 22 May 9
10% May 26 May 16 May 4

April 21

 

Faith 36º F 32º F 28º F 24º F
90% June 6 May 27 May 11 May 1
50% May 18 May 9 April 28 April 16
10% May 5 April 24 April 11

April 3

  

Camp Crook 36º F 32º F 28º F 24º F
90% June 17 June 8 May 26 May 16
50% June 4 May 22 May 11 April 29
10% May 18 May 9 April 29

April 15

  

Oelrichs 36º F 32º F 28º F 24º F
90% June 10 June 3 May 19 May 12
50% May 25 May 15 May 3 April 26
10% May 15 May 4 April 18

April 5

  

Winner 36º F 32º F 28º F 24º F
90% May 30 May 23 May 13 May 3
50% May 16 May 7 April 22 April 15
10% May 2 April 21 April 9

March 30

 

Regional Maps: Median Date for last freeze (32º F) and hard freeze (28º F)

A special thanks to the Midwestern Regional Climate Center for these maps.

Median Date of Last 32���º F Freeze

 

Median Date of Last 28���º F Freeze