There’s not a lot of wild country in Iowa, but it’s out there–and you can find food in a lot of places–from the hedgerows on country roads (asparagus), to the groves and forests between the cornfields. And in town, if you keep your eyes open, you can usually find an apple or pear tree that nobody is harvesting. There are also a few chestnut trees in the city parks, where I’ve managed to come up with a few to roast, and lots of raspberries on the edge of town.
Hunting is great in Iowa–pheasants, ducks, geese, rabbits, and deer. I often go on some restored prairie outside of town, and occasionally in the spring have the chance to help with a prairie burn. It’s always an interesting walk through the field after it goes up in a wall of flames (well worth the price of admission). We once came upon a nest of pheasant eggs which had cooked in the heat; it seemed only right to try them.
FoodIowa 
Another great place to look is old cemeteries. There’s one pioneer cemetery in my county with wild blackberry bushes and hickory trees along the edges, and another has wild asparagus, thick is anything (I mean closely spaced plants, not the stalks themselves) along 3 of the 4 sides. This past spring I got 2-3 dinner sized bunches a week for almost a month. A number of the county’s cemeteries have mulberry trees; homemade mulberry jelly is a real treat.