Matt,
I was born and raised in Tehama county. Killed several pigs out there. Public land is going to be a little tough, finding private where people will let you hunt is even tougher. Right off the bat one area that comes to mind is Grizzly Flatts or Burris Creek out at Black Butte Lake. I was out there in December just driving around and there was plenty of rooting around the area. Out there it's hit or miss. You'll be better off going during the week days because it can get busy during the weekend with hound hunters. If you get down and bust the brush in Grizzly flatts you have a shot at one.
Another area, or areas, not to overlook are the Sacramento River WMAs if you have a boat. From Red Bluff to Colusa almost every one of those areas have hogs. It's tough and thick, but there's a chance.
All those areas I've mentioned are shotgun or bow only. Feel free to ask me any questions. I'll tell you everything I know considering I don't hunt the area anymore. No secrets to keep!lol