It's the end of the Summer. The blackberries are dying to be picked. Mushroom-hunting season is upon us. The pears are falling off the trees.
Another user, Bacchus, pointed out a couple of these to me today and then I did a quick search. I'm sure I've missed some, so if you have a map like this or know of one, post it in the comments.
Urban Foraging by Elski
Food Foraging around Fairfax, California by Tobodi
Orange County, CA
Fallen Fruit - North Orange County by Rwoods
fruit of my labors by Monsieurcris
These maps have only a few Places on them, but I figured I'd mention them anyway.