If we get some snow in late Oct, they'll start moving in with the does. Around here, though, the snow usually comes a little later, Thanksgiving last year. Our general deer season closes Oct 31 so unless we get some early snow, they'll still be high and hard to find.
Several years ago, we had a good snow about the 25th of Oct. The bucks moved down and my partner and I both got decent ones out of herds of does. Their necks were swollen but I don't think the rut had really started yet. They were both very good eating.