I've heard that bears (blacks) are not as hibernational as we think, plus I have some proof. Although they get comfy condos when it gets cold, they have been known to come out in the middle of winter if they decide they've caught a scent of something tasty and the weather's nice...
The concept of hibernation is not as cut and dried as we've been taught.
What's my point? You could be trudging through the woods in snow shoes in early February on a slightly warm day (around zero) (as I did when I was a kid, armed with my Crosman .22 pellet gun) and might see a black wandering about (which I did that day, [at a great distance] and everbody told me I was just seeing a big dog. No. Sorry. It was a black.) Generally speaking, it's rare, but it does happen.