First and last freeze/frost dates for Frederick, MD ,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 27.

Almost certainly, however, you will receive frost from October 31 through April 12.

You are almost guaranteed that you will not get frost from May 12 through October 1.

Your frost-free growing season is around 173 days.

Detailed station data* follows:

Chambersburg 1 Ese, PA (Franklin county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 12 May 7 May 3 Apr 30 Apr 27 Apr 24 Apr 21 Apr 18 Apr 12
Spring 28° Apr 23 Apr 19 Apr 16 Apr 14 Apr 12 Apr 9 Apr 7 Apr 4 Mar 31
Spring 24° Apr 14 Apr 9 Apr 5 Apr 1 Mar 29 Mar 26 Mar 23 Mar 19 Mar 13
Fall 32° Oct 1 Oct 6 Oct 10 Oct 14 Oct 17 Oct 20 Oct 23 Oct 27 Oct 31
Fall 28° Oct 11 Oct 16 Oct 20 Oct 23 Oct 26 Oct 29 Oct 31 Nov 4 Nov 9
Fall 24° Oct 21 Oct 28 Oct 31 Nov 4 Nov 8 Nov 11 Nov 15 Nov 20 Nov 26

Catoctin Mtn Park, MD (Frederick county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 5 May 1 Apr 28 Apr 25 Apr 22 Apr 20 Apr 17 Apr 14 Apr 9
Spring 28° Apr 20 Apr 16 Apr 14 Apr 12 Apr 10 Apr 8 Apr 6 Apr 3 Mar 31
Spring 24° Apr 16 Apr 11 Apr 7 Apr 4 Apr 1 Mar 29 Mar 26 Mar 22 Mar 17
Fall 32° Oct 11 Oct 16 Oct 19 Oct 22 Oct 24 Oct 27 Oct 29 Nov 1 Nov 5
Fall 28° Oct 20 Oct 25 Oct 28 Oct 31 Nov 2 Nov 5 Nov 8 Nov 12 Nov 17
Fall 24° Oct 30 Nov 4 Nov 9 Nov 12 Nov 16 Nov 19 Nov 23 Nov 27 Dec 5

Emmitsburg 2 Se, MD (Frederick county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 15 May 9 May 5 May 2 Apr 29 Apr 26 Apr 22 Apr 18 Apr 13
Spring 28° Apr 28 Apr 24 Apr 21 Apr 19 Apr 17 Apr 15 Apr 12 Apr 10 Apr 6
Spring 24° Apr 16 Apr 11 Apr 8 Apr 5 Apr 2 Mar 30 Mar 27 Mar 23 Mar 18
Fall 32° Sep 29 Oct 3 Oct 7 Oct 9 Oct 12 Oct 15 Oct 18 Oct 21 Oct 26
Fall 28° Oct 8 Oct 14 Oct 18 Oct 22 Oct 25 Oct 29 Oct 31 Nov 4 Nov 10
Fall 24° Oct 16 Oct 22 Oct 27 Oct 31 Nov 2 Nov 6 Nov 9 Nov 14 Nov 20

* 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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