If there is any doubt, I would put some food and water out for the hogs. Some of them have been coming out of hibernation early this year, possibly because of the unusual weather. I have had a hog here all winter – a late hoglet that was big enough to hibernate, but chose not to. If they do come out of hibernation early, there won’t be much food around in the wild for them. If you are not sure, then you could put out cat/kitten biscuits, which should be ok for a few days if they aren’t all eaten at once (as long as they are under cover). Some people leave food out all winter in case.