Last Spring Freeze Dates

It's that time of year again.  The weather is beginning to warm-up and people are making plans to establish their gardens.  However, it’s important to remember that although the days are getting warm, nighttime temperatures still can easily drop below freezing (32°)  into early May.  So, before planting your spring garden consider the chances of a killing freeze.  The tables below display the average date of the last spring freeze for selected cities across Western and Central North Dakota.  Also shown are the dates of the 10th , 50th, 70th and 90th percentiles for the final spring freeze.  In order to interpret these percentiles, lets first consider the 90th percentile. This simply means that 9 out of every 10 years the final spring freeze will occur on or before the date shown.  Likewise, the 10th percentile means that 1 out of every 10 years the final spring freeze will occur on or before the date shown.  The same methods are used to interpret the 50th and the 70th percentiles.

 

Visit the link below for additional sites across North Dakota

 http://cdo.ncdc.noaa.gov/climatenormals/clim20supp1/states/ND.pdf

 

Bismarck Final Spring Freeze

   

 
 

Percentile

ending

on/before

 
 

10%

Apr

29

 

50%

May

14

 

70%

May

20

 

90%

May

27

       
       
       

Average Last Freeze Date

 

May

14

 

Williston Final Spring Freeze

     
 

Percentile

ending

on/before

 
 

10%

May

3

 

50%

May

15

 

70%

May

22

 

90%

May

31

       
       
       

Average Last Freeze Date

 

May

17

 

Dickinson Final Spring Freeze

     
 

Percentile

ending

on/before

 
 

10%

May

9

 

50%

May

23

 

70%

May

28

 

90%

June

10

       
       
       

Average Last Freeze Date

 

May

26

 

 

Minot Final Spring Freeze

     
 

Percentile

ending

on/before

 
 

10%

May

5

 

50%

May

17

 

70%

May

24

 

90%

June

4

       
       
       

Average Last Freeze Date

 

May

20

 

Jamestown Final Spring Freeze

     
 

Percentile

ending

on/before

 
 

10%

April

27

 

50%

May

15

 

70%

May

             19

 

90%

May

30

       
       
       

Average Last Freeze Date

 

May

15



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