Anything buried in the frost affected zone may be shifted around at the frost settles and thaws. Not a good thing for conduits, pipes or foundations.
A Touch of Frost - 1992 Line of Fire Part 1 7-1 is rated/received certificates of: Australia:M
The average frost date for zone 7 is approximately April 15th, with a variance of 15 days either way (~March 30 to April 30). Note that higher elevations may have an increased risk of frost late in the Spring despite the zone, and would fall on the later side of the average. There is no good way to guess the perfect date every year, but if you plant a garden and realize there may be frost, get your plastic and mulch ready.
7 inches. http://www.cloudynights.com/ubbthreads/attachments/2387257-FROST%20LINE%20MAP.doc
frost line in Gwinnett
Well, there more then one frost line in Illinois: 1) 10" to 20" for Southern Illinois 2) 15" to 30" for Central Illinois (frost line for Peoria) 3) 20" to 35" for Northern Illinois
no Frost
The frost line i Michigan measures about 42 inches.
Frost line in SLC is 30"in
The frost line in the state of West Virginia is about 30 inches. This is the depth that frost can penetrate the soil.
What is the frost line depth in louisville Kentucky
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.