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How deep is the frost line for footers in Michigan? I want to put in a small shed in the back yard. 200 square feet large.

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    Where at in Michigan ... big state running North/South. I'm sure up North it's going to be a bit deeper than down at the bottom of the lakes. Apr 17 '15 at 21:30
  • SW Michigan close to Grand rapids Apr 19 '15 at 1:39
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Historically, the frost line has been 42" in Leelanau county, in northern Michigan (http://www.leelanau.cc/howdoia.asp?rid=12). But with the severe cold spells in the past couple of years, where even southerly Kalamazoo, frost has reached down 5 feet in some places, MI municipal code officials may adjust that number downward one day soon.

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