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Deck Design for Wyoming

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I am thinking of redoing the deck on my house in Jackson Hole. 
Is it customary for deck supports to be founded below frost depth? 
I don't think the supports for the current deck are, and there doesn't seem to have been any problems in the 15 years since the house was built.  The current deck is only about 10' x 10' though and  I am thinking of enlarging it to 15' x 30'. 
It is a non-elevated deck, no more than 30 inches off grade.
Gail Kelley