I live in the Sierra Foothills in California. We have foxes, raccoons, skunks visit on the daily. Coyote are def in the area, though I haven't seen any. We even have occasional bears and mountain lions. And there's a wolf that comes through during certain seasons. 
I have a coop on pavers with a dog kennel run (with an actual roof). It is wrapped in 1/4 in hardware cloth with a no-dig apron. The coop itself in only accessible from the run, and it has an auto door that is nearly impossible to open once it's closed (motor-driven). Its locked with a combination tumbler-type lock. The whole thing is surrounded by electric chicken netting with 8000 volts running through it. I lost a chicken to salpingitis and a chick to shipping stress. Not yet lost one to a predator (knocking on wood rn).