They will den up give or take a few days of whenever they did the year previous. Much like the will come out of den the same way. Got this info from a F&G guy who was the predominant bear trapper in Montana for the state, lived next door to me growing up. He said it may seem later one year than the next, or that they came out earlier one year than the next, but it just isn't the case according to the guy I knew.