Like others have said, most campgrounds are closed or in winter mode. It's fairly likely to have (or to have had) some snow on the ground and possibly the roads at that time of year; and snow on the roads means salt on the roads, too. That said, it is possible to camp, it's just limited to dry camping or boondocking for the most part, and you need to keep in mind the real possibility of freezing temperatures.
Even if there is no snow, it's not exactly the prettiest time of year. The leaves are all off the trees, and things generally look a bit on the dismal side, but there's not always enough snow (except on the mountain peaks, which do look glorious and handsome) to brighten things up. I would suggest, if possible, moving the trip back a month or so; with a little care and luck in timing, you could get some beautiful foliage.