Frost Depths for concrete deck peers in northesatern New York State. Albany NY area.

I noticed noone had responded to your inquiry on a couple forums for many days.  While it is admittedly not directed at your specific application, you may be interested is a sort of contour-appearance map of "Extreme Frost Penetration..." in the USA that appears (along with a lot of other stuff!), specifically in the "Foundation Depth" discussion area of  standard ANSI/AWWA D100 Welded Carbon Steel Tanks for Water Storage.  [I would further caution that this map was probably put together in the days before Algore brought "global warming" amongst us.  ;>)]