I am in a similar climate and the only garage stall is filled with my wife's Mazda6, I plan to my plan is to drive the Z for 15 - 30 minutes every couple of weeks. Rarely do we have snow/salt covered roads here for that amount of time. Of course, I don't know circumstances of your parking (other than the now garage).
I worry more about flat spots on the tires than the battery, although the point made about ECU relearning could be a factor.
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Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB
Everything else: 2009 370z, PW Touring 6MT
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