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First and last freeze/frost dates for Princeton, NJ ,United States

First and last freeze/frost dates for:
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Each winter, on average, your risk of frost is from October 13 through April 30.

Almost certainly, however, you will receive frost from October 26 through April 15.

You are almost guaranteed that you will not get frost from May 15 through September 30.

Your frost-free growing season is around 166 days.

Detailed station data* follows:

Flemington 1 Ne, NJ (Hunterdon county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 15 May 10 May 6 May 3 Apr 30 Apr 27 Apr 24 Apr 20 Apr 15
Spring 28° Apr 30 Apr 25 Apr 21 Apr 18 Apr 15 Apr 12 Apr 9 Apr 5 Mar 31
Spring 24° Apr 12 Apr 8 Apr 5 Apr 2 Mar 31 Mar 28 Mar 26 Mar 23 Mar 18
Fall 32° Sep 30 Oct 4 Oct 8 Oct 10 Oct 13 Oct 15 Oct 18 Oct 21 Oct 26
Fall 28° Oct 11 Oct 17 Oct 21 Oct 24 Oct 27 Oct 30 Nov 2 Nov 6 Nov 11
Fall 24° Oct 24 Oct 30 Nov 2 Nov 5 Nov 8 Nov 11 Nov 15 Nov 18 Nov 24

Lambertville, NJ (Hunterdon county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 8 May 4 May 1 Apr 29 Apr 26 Apr 24 Apr 22 Apr 19 Apr 14
Spring 28° Apr 28 Apr 23 Apr 19 Apr 15 Apr 12 Apr 9 Apr 6 Apr 2 Mar 28
Spring 24° Apr 16 Apr 11 Apr 7 Apr 3 Mar 31 Mar 28 Mar 25 Mar 21 Mar 15
Fall 32° Sep 28 Oct 4 Oct 8 Oct 11 Oct 14 Oct 18 Oct 21 Oct 25 Oct 30
Fall 28° Oct 10 Oct 15 Oct 19 Oct 22 Oct 25 Oct 28 Oct 31 Nov 3 Nov 8
Fall 24° Oct 23 Oct 29 Nov 2 Nov 6 Nov 10 Nov 14 Nov 18 Nov 23 Dec 1

Long Valley, NJ (Morris county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 20 May 15 May 11 May 8 May 5 May 2 Apr 29 Apr 25 Apr 20
Spring 28° May 1 Apr 27 Apr 24 Apr 21 Apr 19 Apr 16 Apr 13 Apr 10 Apr 6
Spring 24° Apr 18 Apr 14 Apr 10 Apr 7 Apr 5 Apr 2 Mar 30 Mar 27 Mar 22
Fall 32° Sep 22 Sep 27 Oct 1 Oct 4 Oct 7 Oct 10 Oct 13 Oct 16 Oct 21
Fall 28° Oct 5 Oct 10 Oct 14 Oct 17 Oct 20 Oct 24 Oct 27 Oct 31 Nov 4
Fall 24° Oct 19 Oct 25 Oct 29 Oct 31 Nov 4 Nov 7 Nov 10 Nov 14 Nov 20

* 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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