Blueberries are native to North America and you can find them across the "fruited" plains of the U.S. In fact, the first pilgrims learned from the North American natives how to dry the Blueberries and save them for winter, so native Americans had the first processed super food on the continent. Some varieties of blueberries are also native to South America, and the ripening seasons between the two continents is different, hence you see different varieties available at different times of the year.