First and last freeze/frost dates for Green Bay, WI ,United States

First and last freeze/frost dates for:
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Each winter, on average, your risk of frost is from
October 4 through May 6.

Almost certainly, however, you will receive frost from October 16 through April 24.

You are almost guaranteed that you will not get frost from May 17 through September 21.

Your frost-free growing season is around 151 days.

Detailed station data* follows:

Green Bay Wso Ap, WI (Brown county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 17 May 13 May 10 May 8 May 6 May 3 May 1 Apr 28 Apr 24
Spring 28° May 7 May 3 Apr 30 Apr 27 Apr 25 Apr 22 Apr 20 Apr 17 Apr 13
Spring 24° Apr 20 Apr 17 Apr 14 Apr 12 Apr 10 Apr 8 Apr 6 Apr 3 Mar 31
Fall 32° Sep 21 Sep 25 Sep 28 Oct 1 Oct 4 Oct 6 Oct 9 Oct 12 Oct 16
Fall 28° Sep 25 Oct 1 Oct 6 Oct 10 Oct 14 Oct 17 Oct 21 Oct 26 Nov 1
Fall 24° Oct 15 Oct 20 Oct 24 Oct 27 Oct 29 Oct 31 Nov 3 Nov 6 Nov 11

Shawano, WI (Shawano county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° Jun 3 May 28 May 24 May 20 May 17 May 14 May 10 May 6 Apr 30
Spring 28° May 19 May 14 May 11 May 8 May 5 May 2 Apr 29 Apr 26 Apr 21
Spring 24° May 4 Apr 28 Apr 24 Apr 21 Apr 18 Apr 15 Apr 11 Apr 7 Apr 2
Fall 32° Sep 12 Sep 17 Sep 20 Sep 22 Sep 25 Sep 27 Sep 29 Oct 2 Oct 7
Fall 28° Sep 23 Sep 26 Sep 29 Oct 2 Oct 4 Oct 6 Oct 9 Oct 12 Oct 15
Fall 24° Sep 29 Oct 5 Oct 10 Oct 14 Oct 18 Oct 21 Oct 25 Oct 30 Nov 4

Oconto 4 W, WI (Oconto county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 31 May 25 May 21 May 18 May 15 May 12 May 8 May 4 Apr 29
Spring 28° May 15 May 10 May 7 May 4 May 1 Apr 29 Apr 26 Apr 22 Apr 18
Spring 24° May 2 Apr 27 Apr 24 Apr 21 Apr 18 Apr 15 Apr 12 Apr 9 Apr 4
Fall 32° Sep 15 Sep 19 Sep 22 Sep 25 Sep 27 Sep 29 Oct 2 Oct 5 Oct 9
Fall 28° Sep 22 Sep 27 Oct 1 Oct 4 Oct 7 Oct 10 Oct 14 Oct 17 Oct 23
Fall 24° Oct 2 Oct 8 Oct 13 Oct 17 Oct 21 Oct 25 Oct 29 Nov 2 Nov 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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