Do deer patterns change when acorns run out in December?
Yes — significantly. As acorns clean out (typically mid-December across most of the range), deer shift to brassicas, standing crops, browse, and food plots. New patterns lock in within a few days, often making the late season the most patternable of the year.
Brassica plots peak in palatability after first frost, conveniently filling the post-acorn window. Standing corn and soybeans pull hard. South-facing browse zones get hit. Trail cameras refocused on food sources in mid-December typically show clear new patterns within a week.
Late season is also when post-rut bucks return to home ranges and recover body condition on food. Some of the most reliable mature buck encounters of the year come from late-season food plot setups. See state late-season rut dates and current mast reports.