I don’t see why the Hosta’s would not grow back, even if you were to cut them back now. Since we are in about the same zone, I think that it would be OK if you cut them back, but make sure not to completely cover them. They may continue to grow throughout the spring and summer, and I never trim them at the first frost, I never even put much over them at the first frost, now my roses that’s a whole other story.

You might try mixing a liquid pepper concoction to spray near the Hosta’s to keep the pesky rabbits away, if not B.B. or pellet guns work wonders, and you can always can the meat.