You must live a bit southish, because my wife & I recently bought some property in northern Wisconsin - a number of acres between a larger lake and a smaller lake, and as I type I am in our camper trailer at a campground near the property (WI-FI!!), and I spent the afternoon walking and riding around the property (ATV). It is just teaming with wild raspberry and blackberry bushes, and though I got a handful of ripe berries, for the most part they are weeks or more away from being ripe.
BTW, as I was standing there on the property a doe and her young fawn came trotting (?) across the property from one edge of trees to the other. Wonderful sight ... I wished my camera wasn't in the car. Sigh.
I can't wait until the berries ARE ripe. Yum! Unfortunately, I think when that time comes we need to be a bit wary about suprising bears that might be enjoying them too.
We also have wild blueberries near a lower-lying lake. We'll have to watch for them - we don't know much about them - they seem to ripen later in the fall?? I'm guessing the bears like them too.
The property also has a handful of really unique apple trees (essentially very large berries!!). The apples we picked from them last fall were tiny - but bigger than crab apples, and very sweet & delicious, and completely free of any insect damage or nasty marks. We wonder if this is what apples were like before they started hybridizing them. Some are very pale - almost white, and some are pinkish. None are bright red like the apples you see in the store.
We're going to enjoy the north country!!
Ken