But the most common weather-related trend is that colder weather is jump-starting deer movement from Mike Bleech's Northeast to the West region covered by Jeff Holmes. The big take-home point here is that a drop in the mercury can spur strong pre-rut activity, weeks before normal, and you need to react quickly. We saw a similar phenomenon last fall in the North Central, when cold conditions arrived early and never left. This is why it's so important now to keep tabs on the latest rub lines, scrapes, hot feeding areas, and the home ranges of doe family groups. The switch governing intense buck-breeding behavior can flip in an instant, and weather is one of the strongest drivers. If you're behind the proverbial 8-ball when all it happens, you can waste valuable time simply trying to find a good buck to hunt, much less slapping your tag on him. On the other hand, if you've done your homework, you'll be ready to capitalize as soon as a sharp cold front kick-starts rutting action.