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First and last freeze/frost dates for Long Island, New York, USA

First and last freeze/frost dates for:
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Each winter, on average, your risk of frost is from October 27 through April 14.

Almost certainly, however, you will receive frost from November 14 through March 29.

You are almost guaranteed that you will not get frost from May 1 through October 9.

Your frost-free growing season is around 196 days.

Detailed station data* follows:

Setauket, NY (Suffolk county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 1 Apr 25 Apr 21 Apr 17 Apr 14 Apr 11 Apr 8 Apr 3 Mar 29
Spring 28° Apr 12 Apr 8 Apr 4 Apr 1 Mar 30 Mar 27 Mar 24 Mar 21 Mar 17
Spring 24° Apr 3 Mar 30 Mar 27 Mar 24 Mar 21 Mar 19 Mar 16 Mar 13 Mar 9
Fall 32° Oct 9 Oct 15 Oct 20 Oct 24 Oct 27 Oct 31 Nov 3 Nov 8 Nov 14
Fall 28° Oct 27 Oct 30 Oct 31 Nov 2 Nov 3 Nov 5 Nov 6 Nov 9 Nov 11
Fall 24° Oct 28 Oct 31 Nov 3 Nov 5 Nov 7 Nov 10 Nov 12 Nov 15 Nov 19

Bridgeport Wso Ap, CT (Fairfield county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° Apr 22 Apr 18 Apr 15 Apr 13 Apr 11 Apr 8 Apr 6 Apr 3 Mar 30
Spring 28° Apr 7 Apr 3 Apr 1 Mar 29 Mar 27 Mar 25 Mar 22 Mar 20 Mar 16
Spring 24° Apr 2 Mar 28 Mar 25 Mar 23 Mar 20 Mar 18 Mar 15 Mar 12 Mar 8
Fall 32° Oct 20 Oct 25 Oct 29 Oct 31 Nov 3 Nov 6 Nov 9 Nov 13 Nov 18
Fall 28° Nov 3 Nov 8 Nov 12 Nov 15 Nov 18 Nov 21 Nov 25 Nov 28 Dec 5
Fall 24° Nov 13 Nov 19 Nov 22 Nov 26 Nov 29 Dec 2 Dec 6 Dec 9 Dec 15

Stamford 5 N, CT (Fairfield county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 11 May 7 May 4 May 1 Apr 29 Apr 26 Apr 23 Apr 20 Apr 16
Spring 28° Apr 26 Apr 22 Apr 19 Apr 16 Apr 14 Apr 11 Apr 9 Apr 6 Apr 2
Spring 24° Apr 11 Apr 6 Apr 3 Apr 1 Mar 29 Mar 27 Mar 24 Mar 21 Mar 17
Fall 32° Oct 1 Oct 4 Oct 7 Oct 10 Oct 12 Oct 14 Oct 16 Oct 19 Oct 23
Fall 28° Oct 12 Oct 16 Oct 20 Oct 23 Oct 26 Oct 28 Oct 31 Nov 3 Nov 7
Fall 24° Oct 22 Oct 28 Oct 31 Nov 4 Nov 7 Nov 11 Nov 14 Nov 18 Nov 24

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

For each station, you will see a temperature along with a pile of percentage columns. Here's how it works: The percent column tells you the probability that you will experience that row's temperature on or before that date.

So, for example, in the Spring 32° row, if you have "Apr 15" under the 50% column, that means that you have a 50% chance of seeing frost on or before April 15th.

Another example. Say in the Fall 24° row, under 90%, you have Dec 1, then that means that you have a 90% chance of seeing 24 degrees on or before December 1st.

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


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