Scout now. Post season is a fine time to see where they are and might be. It won't hurt too much if you jump them now, too. Of course, in some places with fine hunting, you may not be ABLE to scout untill the actual season opens. I'm thinking of the Walk-In Hunting Area program in Kansas. Great program with some fine folks opening up their land, but it usually isn't open much if any before the season.
That aside, scout during spring and summer if you can. Espically late summer, as that will likely be their early bow season movement pattern. Things start getting crazy when thousands of people start stomping in the woods.