First and last freeze/frost dates for Seattle, WA ,United States

First and last freeze/frost dates for:
  Your results  
Each winter, on average, your risk of frost is from October 26 through April 6.

Almost certainly, however, you will receive frost from November 13 through March 19.

You are almost guaranteed that you will not get frost from April 25 through October 7.

Your frost-free growing season is around 203 days.

Detailed station data* follows:

Everett, WA (Snohomish county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° Apr 25 Apr 19 Apr 14 Apr 10 Apr 6 Apr 3 Mar 30 Mar 25 Mar 19
Spring 28° Mar 21 Mar 13 Mar 8 Mar 3 Feb 27 Feb 22 Feb 18 Feb 12 Feb 5
Spring 24° Feb 25 Feb 16 Feb 10 Feb 5 Jan 31 Jan 26 Jan 21 Jan 14 Jan 4
Fall 32° Oct 7 Oct 13 Oct 18 Oct 22 Oct 26 Oct 29 Nov 1 Nov 6 Nov 13
Fall 28° Oct 24 Nov 2 Nov 9 Nov 15 Nov 21 Nov 26 Dec 3 Dec 10 Dec 20
Fall 24° Nov 9 Nov 21 Dec 2 Dec 9 Dec 17 Dec 24 Jan 2 Jan 12 Jan 27

Quilcene 2 Sw, WA (Jefferson county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 6 May 1 Apr 27 Apr 23 Apr 20 Apr 17 Apr 14 Apr 10 Apr 4
Spring 28° Apr 12 Apr 2 Mar 26 Mar 19 Mar 14 Mar 8 Mar 1 Feb 22 Feb 12
Spring 24° Mar 6 Feb 25 Feb 18 Feb 12 Feb 7 Feb 2 Jan 27 Jan 20 Jan 9
Fall 32° Oct 3 Oct 8 Oct 11 Oct 14 Oct 17 Oct 20 Oct 23 Oct 26 Oct 31
Fall 28° Oct 22 Oct 30 Nov 4 Nov 9 Nov 14 Nov 19 Nov 24 Dec 1 Dec 9
Fall 24° Nov 7 Nov 19 Nov 27 Dec 6 Dec 13 Dec 20 Dec 27 Jan 5 Jan 19

Bremerton, WA (Kitsap county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° Apr 23 Apr 16 Apr 11 Apr 7 Apr 4 Mar 31 Mar 27 Mar 22 Mar 16
Spring 28° Mar 17 Mar 8 Mar 1 Feb 23 Feb 17 Feb 12 Feb 6 Jan 30 Jan 21
Spring 24° Feb 24 Feb 13 Feb 6 Jan 30 Jan 23 Jan 16 Jan 8 Dec 26
Fall 32° Oct 29 Nov 3 Nov 7 Nov 11 Nov 15 Nov 18 Nov 22 Nov 26 Dec 3
Fall 28° Nov 10 Nov 19 Nov 25 Dec 1 Dec 6 Dec 11 Dec 16 Dec 23 Dec 31
Fall 24° Nov 25 Dec 7 Dec 16 Dec 24 Dec 31 Jan 8 Jan 17 Jan 31

* This station data is available courtesy the National Climatic Data Center.

For each weather station, you will see a temperature along with tables of data organized into percentage columns. The percentage column tells you the probability that you will experience that row's temperature on or near that date. Here are two examples to help you determine your probable last frost and first freeze dates.

Example 1 (Last Frost). In the Spring 32° row, if you have "Apr 15" under the 50% column, that means you have a 50% chance of seeing frost on or before April 15th.

Example 2 (First Freeze). In the Fall 24° row, if you have "Dec 1" under the 90% column, that means you have a 90% chance of seeing 24 degrees on or after December 1st.

Empty cells indicate you have a less than 10% chance of ever seeing that temperature.

BACK TO TOP