what do you mean by frost line frost will penetrate up to three feet in the dead of winter if that is what you are asking.
11590
About 20 miles.
USA Today published the following pdf file that shows the frost line of all areas of the USA. http://www.soundfootings.com/pdf/US_Map_Frost_DepthAVG.pdf This shows that the great city of Buffalo, New York has a frost depth of 35 inches. I have heard of depths up to 48 inches for Buffalo. South Buffalo is always a bit warmer and friendlier.
48"
3.5 to 4 ft
westbury train station
4 feet
For Orange County is 50 inches or 4'-2". I would use 4'-6" for design.
The address of the Westbury Art And Photo is: 234 Post Ave, Westbury, NY 11590
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The address of the Historical Society Of The Westburys C O Gilbert W Mcgill is: 445 Jefferson Street, Westbury, NY 11590