I live in Montesano. There are quite a few farms open to hunting, but they get hit 7 days a week. You can scratch a few birds if you're willing to spend all day. I used to hunt those fields years ago back when people actually went to the farmers and asked permission. Not many people put forth that kind of effort so only a few people hunted them and the hunting was great. Now anyone can just show up and hunt, so people come from miles around because it's easy public access. It's ruined the hunting in my opinion. I don't like crowds so don't hunt them anymore. If you can sneak away during mid week, you might get a field to yourself. Weekends you will be fighting for a spot.
