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First and last freeze/frost dates for Saint Louis, MO ,United States

First and last freeze/frost dates for:
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Each winter, on average, your risk of frost is from October 17 through April 12.

Almost certainly, however, you will receive frost from November 1 through March 29.

You are almost guaranteed that you will not get frost from April 27 through October 2.

Your frost-free growing season is around 188 days.

Detailed station data* follows:

St Charles, MO (St. Charles county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° Apr 27 Apr 22 Apr 18 Apr 15 Apr 12 Apr 10 Apr 7 Apr 3 Mar 29
Spring 28° Apr 15 Apr 11 Apr 8 Apr 5 Apr 2 Mar 30 Mar 27 Mar 24 Mar 20
Spring 24° Apr 6 Apr 1 Mar 29 Mar 26 Mar 23 Mar 21 Mar 18 Mar 14 Mar 9
Fall 32° Oct 2 Oct 7 Oct 11 Oct 14 Oct 17 Oct 20 Oct 24 Oct 27 Nov 1
Fall 28° Oct 18 Oct 23 Oct 27 Oct 30 Nov 1 Nov 4 Nov 8 Nov 12 Nov 17
Fall 24° Oct 22 Oct 29 Nov 2 Nov 7 Nov 11 Nov 15 Nov 19 Nov 24 Dec 2

St Louis Wb Ap, MO (St. Louis county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° Apr 19 Apr 15 Apr 12 Apr 9 Apr 7 Apr 5 Apr 2 Mar 30 Mar 26
Spring 28° Apr 10 Apr 5 Apr 1 Mar 29 Mar 26 Mar 23 Mar 20 Mar 16 Mar 11
Spring 24° Apr 3 Mar 28 Mar 24 Mar 21 Mar 18 Mar 15 Mar 11 Mar 7 Mar 2
Fall 32° Oct 14 Oct 19 Oct 23 Oct 26 Oct 29 Oct 31 Nov 2 Nov 6 Nov 11
Fall 28° Oct 26 Oct 31 Nov 3 Nov 6 Nov 9 Nov 13 Nov 16 Nov 20 Nov 25
Fall 24° Nov 4 Nov 9 Nov 13 Nov 16 Nov 19 Nov 22 Nov 26 Dec 1 Dec 6

Alton Dam 26, IL (Madison county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° Apr 17 Apr 13 Apr 11 Apr 9 Apr 6 Apr 4 Apr 2 Mar 31 Mar 27
Spring 28° Apr 13 Apr 7 Apr 2 Mar 29 Mar 26 Mar 22 Mar 19 Mar 14 Mar 8
Spring 24° Apr 4 Mar 29 Mar 25 Mar 21 Mar 17 Mar 13 Mar 10 Mar 5 Feb 27
Fall 32° Oct 15 Oct 21 Oct 25 Oct 28 Oct 31 Nov 3 Nov 7 Nov 11 Nov 17
Fall 28° Oct 25 Oct 31 Nov 5 Nov 9 Nov 13 Nov 16 Nov 21 Nov 25 Dec 3
Fall 24° Nov 3 Nov 9 Nov 14 Nov 18 Nov 22 Nov 26 Dec 1 Dec 5 Dec 12

* 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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