The area I hunt doesn't seem to have what I would consider a migration like you'd experience in the Cascades. Surely some years the snow pushes the deer lower but we've found sheds at 5400 feet on a mountain that's only 5800 feet total. In fact, we've found the dryness of the brouse has far more to do with moving animals off of the open hillsides and driving the deer lower than the weather or the snow. Twice in the last ten years or so, there's been no sign above timberline between the 5000 foot elevation and the top. The lodgepole thickets on top that's always held animals, had no sign whatsoever. If I wasn't so stubborn, I'd move down some but I've never seen the one I'm looking for down low and I always figure another hunter may push some in to the area.