The blueberries are making their appearance in the Boundary Waters Canoe Area Wilderness & Ely, Minnesota. It's just the start of the blueberry picking season. Right now you may mainly find them in the sunny warmer spots. It will still be a little bit before the shady locations will have better quantities.
Blueberries tent to like acidic soil. They tend to like to be around Jack pine trees. They are typically in partially shaded wooded areas. A blueberry picking spot is something that most will keep a secret so they can return each year with out much competition.