Anyone have advice on how to find someone who is completely off the grid? No internet, no known address, and no phone that I'm aware of?

I haven't talked to my father in almost a year, since shortly after his home was burned down in the Camp Fire in CA last year. Last I heard he was enjoying life in the refugee camp. Those camps have all closed now.

Not worried about his health, he's the Ubermensch! But, I'd like to find him and I don't know where to start since I'm in a different state.