I saw a good chart of average frost penetration for Illinois.
10" to 20" for southern Illinois
15" to 30" for central Illinois (frost line for Peoria)
20" to 35" for northern Illinois
The average first frost in Peoria IL occurs around October 19th. The earliest first frost in Peoria was on September 20th. The latest first frost occurred on November 12th.
The frost is most likely 36 to 40 inches deep, at the frost line. The ground will never freeze below that level.
Nearby Wheaton has a frostline depth of 42 inches, so Naperville should have close to the same.
See the related link for further information.
41° 44′ 53″ N, 88° 9′ 56″ W
It depends on where you live and is associated with latitude. The further you go north or south of the equator, the deeper the frost line tends top be.
Christina Kuehner, from Naperville, IL
There are 102 counties in Illinois.
Illinois
42"
Naperville has more than one zip code.http://www.zipmap.net/Illinois/DuPage_County/Naperville.htm
35 mls
· Naperville is a city in Illinois
The address of the Naperville Hose Company One Incorporated is: Po Box 4684, Naperville, IL 60567-4684
Anthony Parker is from Naperville, Illinois
naperville, Illinois
twenty eight
Naperville, Illinois
Naperville is a suburb of Chicago. It is in DuPage and Will Counties, Illinois.
The address of the Naper Settlement is: 523 South Webster Street, Naperville, IL 60540
Aurora,NaperVille, Rockford, Chicago and Joliet.