Here in the UK I helped a friend establish what Safetalker is describing. I'd say our climate here in the UK is pretty similar to what you have in the PNW and probably could grow the same stuff whilst it wouldn't make he and his family completely self sufficient he is pretty close to it. He has a bunch of stuff in the forest itself and has 2 or 3 decent sized meadows of cereal crop and if he wanted to could probably use another meadow or 2 to keep a sheep or 2 (by the way don't discount the utility of sheep as a good shtf resource) http://en.wikipedia.org/wiki/Forest_gardening is a good read

The stocking levels Breacher recommends is pretty spot on in my opinion. The way I've worked out for myself, I can live for 2 weeks initially on what I have in my house. I have rations to sustain me for a bug out for a month and spread out in caches I have food to last me 8 months so I can survive until a harvest happens.