I have a sports car that I do not drive in winter, it will be put away by the end of the month. My winter car has winter tires all year round but if I had to change tires I would do so no later than next weekend. Winter is just around the corner( light flurries yesterday) and you don't want to get caught without proper tires especially if you drive a lot. It's cold enough now that summer tires should be removed, they are very dangerous in cold/icy conditions. All seasons are useless for our winters.