I'm up in northern Alberta, Canada, and just bought my first TR. My garage, also, is unheated, but I think as long as I store it properly and either keep a trickle charge on the battery or store it indoors, I should be fine.
My recomemndation would be to keep it on a trickle charger and then use it on nice winter days (i.e no snow, no salt). If you run it a few times over the winter, you will have a much happier TR than one which has just sat for 4-5 months. It seems that when Ferraris sit, that is when things start to go wrong.
If the garage is heated or not, should not make much of a difference.
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