First and last freeze/frost dates for Rockport, 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 8 through April 8.

Almost certainly, however, you will receive frost from December 6 through March 17.

You are almost guaranteed that you will not get frost from April 29 through October 14.

Your frost-free growing season is around 214 days.

Detailed station data* follows:

Concrete, WA (Skagit county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° Apr 29 Apr 22 Apr 16 Apr 12 Apr 8 Apr 3 Mar 30 Mar 24 Mar 17
Spring 28° Mar 20 Mar 9 Mar 2 Feb 23 Feb 17 Feb 11 Feb 5 Jan 28 Jan 18
Spring 24° Mar 1 Feb 20 Feb 14 Feb 8 Feb 3 Jan 28 Jan 22 Jan 14 Dec 31
Fall 32° Oct 14 Oct 23 Oct 30 Nov 3 Nov 8 Nov 14 Nov 19 Nov 26 Dec 6
Fall 28° Nov 2 Nov 11 Nov 18 Nov 24 Dec 1 Dec 6 Dec 12 Dec 19 Dec 28
Fall 24° Nov 20 Dec 2 Dec 9 Dec 16 Dec 22 Dec 28 Jan 4 Jan 13 Jan 30

Newhalem, WA (Whatcom county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 4 Apr 25 Apr 18 Apr 13 Apr 7 Apr 2 Mar 28 Mar 21 Mar 12
Spring 28° Mar 22 Mar 12 Mar 5 Feb 27 Feb 21 Feb 15 Feb 9 Feb 2 Jan 23
Spring 24° Mar 4 Feb 21 Feb 13 Feb 7 Jan 31 Jan 25 Jan 17 Jan 8 Dec 22
Fall 32° Oct 20 Oct 27 Oct 31 Nov 4 Nov 8 Nov 12 Nov 16 Nov 21 Nov 28
Fall 28° Oct 31 Nov 11 Nov 19 Nov 26 Dec 4 Dec 10 Dec 17 Dec 25 Jan 5
Fall 24° Nov 14 Nov 24 Dec 3 Dec 10 Dec 16 Dec 23 Dec 30 Jan 8 Jan 26

Diablo Dam, WA (Whatcom county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 6 Apr 30 Apr 26 Apr 22 Apr 19 Apr 15 Apr 12 Apr 8 Apr 2
Spring 28° Apr 4 Mar 25 Mar 18 Mar 12 Mar 7 Mar 1 Feb 23 Feb 16 Feb 7
Spring 24° Mar 9 Feb 28 Feb 22 Feb 17 Feb 12 Feb 7 Feb 1 Jan 26 Jan 17
Fall 32° Oct 14 Oct 19 Oct 23 Oct 27 Oct 30 Nov 1 Nov 4 Nov 8 Nov 14
Fall 28° Oct 28 Nov 4 Nov 10 Nov 15 Nov 20 Nov 25 Dec 1 Dec 7 Dec 16
Fall 24° Nov 11 Nov 21 Nov 28 Dec 5 Dec 11 Dec 17 Dec 23 Dec 30 Jan 9

* 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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