I'm surrounded by dozens of oak trees....I think they'll be fine. I didn't cover my strawberries last year & they were fine. Strawberries can take some good cold. I'd imagine we have much longer cold spells here than you do, but it was a mild year. Now if they were mine I'd trim them to the crown after they start to die back & then surround them with chicken wire & stuff with leaves. Not sure if you have leaves, I have TONS so that's why it's my first thought.
