I have one four season tent and a couple of three season tents.I've used both for winter camping.The only problem you might normally incounter using a three season tent in the winter is a heavy wet snow.Even this would only be a problem if you were not aware of what was going on.As long as you keep the snow from building up on the tent there won't be a problem.Most three season tents have a one piece fly that goes over the part that is ventilated.On one of mine the fly doesn'treach the ground,so I've got to bank a little snow around it.We will be camping in the trees and its quite protected from the wind.

Hiram just make sure the netting is in good shape so the "skeeters" won't get ya.