DigitalVinyl wrote:

All the supple green leaves are
now wilted and limp (we are sustaining cold under 30 degrees
throughout the night day). Does this hurt the plant?

Nope. A killing frost will make the leaves wilt and kill them. This is
normal.

Look at the canes. were they tan or brown before the freeze or green. If
they were brown, then they probably have already hardened off and the cold
did not nor will it hurt the vine. If they were green and now are sort of
soft and mushy, then they are probably dead.