First and last freeze/frost dates for Frederick, MD ,United StatesFirst and last freeze/frost dates for:
Detailed station data* follows:
Chambersburg 1 Ese, PA (Franklin county):
|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):
|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):
|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.