Using fresh cherries makes this classic cherry pie extra flavorful and delicious. So if you're in the midst of cherry season (summer), I highly recommend using fresh. However, if you want to make this outside of the summer season or you don't have access to fresh, you can substitute frozen cherries. Let them thaw in the fridge briefly before cooking them on the stove. If you want to use canned/jarred cherries, be sure to grab whole cherries rather than a pre-made filling.