My little Bloomsweet barely managed to survive in the PNW, zone 8a, covered, and near the south facing side of a house.
Suffered severe bark damage, but actually managed to hold on to two leaves, which have since greened up a little bit but still look a bit yellowish and not healthy. Colder winter than usual and lots of snow.
I don't think it could have survived any more cold than it experienced.
It might have done better in the South (or Texas).