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

First and last freeze/frost dates for:
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Each winter, on average, your risk of frost is from November 18 through March 14.

Almost certainly, however, you will receive frost from December 12 through February 11.

You are almost guaranteed that you will not get frost from April 14 through October 27.

Your frost-free growing season is around 249 days.

Detailed station data* follows:

Olga 2 Se, WA (San Juan county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° Apr 14 Apr 3 Mar 27 Mar 20 Mar 14 Mar 8 Mar 1 Feb 21 Feb 11
Spring 28° Mar 4 Feb 23 Feb 16 Feb 10 Feb 4 Jan 29 Jan 22 Jan 14 Dec 29
Spring 24° Feb 18 Feb 6 Jan 28 Jan 20 Jan 13 Jan 5 Dec 27 Dec 13 - -
Fall 32° Oct 27 Nov 3 Nov 8 Nov 13 Nov 18 Nov 22 Nov 27 Dec 4 Dec 12
Fall 28° Nov 12 Nov 21 Nov 28 Dec 6 Dec 11 Dec 17 Dec 24 Jan 1 Jan 17
Fall 24° Nov 21 Dec 5 Dec 15 Dec 23 Jan 1 Jan 10 Jan 21 Feb 11 - -

Anacortes, WA (Skagit county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° Apr 7 Mar 30 Mar 24 Mar 19 Mar 14 Mar 9 Mar 4 Feb 26 Feb 18
Spring 28° Mar 12 Mar 3 Feb 23 Feb 17 Feb 12 Feb 6 Jan 31 Jan 24 Jan 14
Spring 24° Feb 28 Feb 18 Feb 10 Feb 4 Jan 29 Jan 23 Jan 16 Jan 7 Dec 22
Fall 32° Oct 23 Oct 31 Nov 5 Nov 10 Nov 14 Nov 19 Nov 24 Nov 29 Dec 8
Fall 28° Oct 31 Nov 10 Nov 18 Nov 25 Dec 2 Dec 8 Dec 15 Dec 23 Jan 3
Fall 24° Nov 20 Dec 2 Dec 10 Dec 17 Dec 24 Dec 31 Jan 7 Jan 17 Feb 4

Port Angeles, WA (Clallam county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 6 Apr 23 Apr 14 Apr 7 Mar 30 Mar 23 Mar 15 Mar 6 Feb 21
Spring 28° Apr 3 Mar 20 Mar 9 Feb 28 Feb 19 Feb 11 Feb 1 Jan 21 Jan 3
Spring 24° Feb 24 Feb 15 Feb 8 Feb 2 Jan 27 Jan 20 Jan 13 Jan 1 - -
Fall 32° Oct 18 Oct 26 Oct 31 Nov 5 Nov 10 Nov 14 Nov 19 Nov 25 Dec 5
Fall 28° Nov 7 Nov 17 Nov 24 Nov 29 Dec 6 Dec 12 Dec 18 Dec 25 Jan 5
Fall 24° Nov 23 Dec 6 Dec 15 Dec 23 Dec 31 Jan 9 Jan 19 Feb 8 - -

* 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.


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