wintering spider mites

[augiedog55]

I've got a question for you experts.
Last yr I grew my tomatoes in smart pots. Out of all my plants in them 3 had spider mites. Here is my question. I wasn't thinking and after the frost i emptied all my bags and put them in my garage in a pile. Here is my question. By bringing them in my garage will they hatch down there over the winter and contaminate all the bags they were in contact with and the surrounding area?? Also if they haven't hatched is there anything I can wash all my bags in that will kill them?
My garage is the place I'm going to grow my seedlings in this spring.. Did I mess up big time by bringing those bags in? Am I doomed from the start for growing my seedlings in the garage ?AGGHHHHHHHHH