BTW...Deer haven't "yarded up" here in NJ at all this year. And in fact in most years they really never do. The concept that deer "yard" in NJ is a misnomer at best in all but the harshest periods of extended bad winters.
What deer do however do in NJ, even in moderate winters is to forgo their traditional solitude, where small maternal groups of does and fawns, and separately bucks and/or bachelor groups traditionally avoid interacting with each. Instead, when winter hits, and more specifically when snow falls, these groups find benefit in traveling and feeding together
within their regular pre-existing home range, (This being different from yarding where deer either migrate to a new home range, or limit movement within their traditional home areas to only a very small part that is generally a low lying area dominated by heat retaining conifers and don't leave unless threatened by predators.)
The moral of the story being, regardless of the fact that the deer will concentrate under normal NJ winter conditions they will generally still travel throughout most of their year round home range looking for food. (This is especially true if you have habituated them to baiting where they know they can easily find concentrated food). Which means that if your area holds good numbers of deer, regardless of whether they have concentrated due to cold snow weather they will still show up. In fact, they are actually not only more likely to show up..but also to stay in the area of that food source,(bait).
From the perspective of personal observation, I had yet to see any large concentrations of deer, (more than4-6) traveling to my bait piles this year prior to yesterday due to the rather mild temperatures. However, with yesterdays new snow fall it seemed to kick the deers instinct to concentrate into high gear. Yesterday for the first time all year I had 13 does and fawn all walk into the corn pile in single file together.
JC