ORIGINAL: Schobs
focus on food sources, later in the season the bucks are doin what they can to rebuild their strength after the rut and put on the pounds before winter gets too harsh. with all the snow on the ground you should be able to get a pretty good idea of where they're movin, its just a matter of bein there when the deer are there.
What he said + make sure your cloths are quiet, sound is amplified. Wool is best. I don't sit in trees either, and I usually only hunt from noon till dark. When it's really cold I've logged more deer during the afternoon which leads me to believe that the warmest part of the day is when they'll move instead of wasting energy during the morning when it's the coldest. One last thing....draw your bow every half hour or soto keep your muscles from getting too stiff. Good luck.