Ontario Ministry of Transportation. The Eng-Tips staff will check this out and take appropriate action. Join your peers on the Internet's largest technical engineering professional community. Also, stay cognizant of the difference between open field values and values for use with heated structures. I've used the air freezing index from here:
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Thank you for helping keep Eng-Tips Forums free from inappropriate posts. I initially looked at Maine which is mostly consistent with my experience and didn't check any further. In Lindsay, Ontario the depth of frost penetration is typically 4' The frost line —also known as frost depth or freezing depth —is most commonly the depth to which the groundwater in soil is expected to freeze. Keep in mind that site soil conditions greatly influence these values. I work in the Ohio and Pennsylvania areas, and as a reference, southern Ohio Cincinnati area is about 30", and Cleveland is 42".