Hi suerich17
Sorry to hear the hogs there have gone awol. There are all sorts of potential reasons why they may have gone missing. i.e. their route may be blocked (someone may have repaired fences, etc.), someone else may have started feeding, males may be visiting other parts of their ranges, etc. The first returners from hibernation are usually males.
It seems unlikely that they would go back into hibernation because of the cold when they had access to food. Hibernation is a complicated thing which is not fully understood, but it isn’t only to do with temperature. Some hogs decide not to hibernate and the cold doesn’t seem to bother than too much. But I suppose it is possible.
I would continue offering food and, especially, water and hopefully you will eventually get hog visitors again.
Good luck.
