Does the temp in your garage drop below freezing? If so, you may not want to go that low. As far as parking your ferment in colder climate, you need to look at the temperature range for your yeast. Some of my fruit wines I actually time with starting as the temps drop because I want low and slow, since it can typically enhance the fruitiness of the wine. I generally park my bulk aging carboys that were started this season, glass and better bottles, in my basement garage over the winter...I just do not leave them directly on concrete(flattened cardboard boxes, etc). My garage usually hangs in the 40s over the winter, though it can vary if it is colder than normal. And a temperature drop of even 10F helps immensely with clearing. Oh, and I fill airlocks with puregrain or vodka so they do not freeze.