Are they "hardy" or "florist" type mums? Either way, since most of the state is under a foot of snow, I would think the garage is about your only option. I assume your garage has windows and doesn't get below freezing? If so, keep them only wet enough so they don't wilt, run them very dry, brightest light possible, but don't extend day length with gro lights. You want to keep them dormant until spring when you can plant them out after the last frost. Good luck.

I inadvertantly overwintered mums in my garage one year. Just put the pot I had them in into the garage and forgot about them. They grew fine the next summer. Mums do like it dry-ish in the winter.

tj