I wish I could help you out, but the only u-pick I know of is in Nevada (Iowa). If I recall correctly, they advertise picking in June and it's for strawberries and some other fruit. I'm sure you miss your chokecherries!

Iowa has "almost wild" fruit along the back roads...but you have to know where. My favorite is American Plums...like Lewis and Clark found here. Best way is to go to farmer's markets and talk with the local older folks. They may know where to look. Ask to buy some from them..be sure you know the right season for the fruit. You're safe if you ask in spring. Since Iowa is heavily cropped and the fields are getting bigger ..factory farming..it can be assumed that the fruit has been exposed to spray. An old farmer actually took my husband and I into the back roads and showed us the trees and helped us pick them. Another thing is to find out who owns the land and get information and permission. Beware of poison ivy. Hill country is the most likely place to find what you want. The plains are huge factory fields. Joyce in Iowa