If the leaves get frozen and turn brown, your done. No more maturation can take place as no more photosynthesis can take place.
I don't think that will be a problem. They let them hang after frost in WA State like that quite often. Brix can/will go up as the grapes start to lose water as nothing is moving anymore through the vine.
That sounds like a bigger problem to me..... If you don't have it by now I would start investigating a Plan "B" quickly!
I will answer this for you before proceding to check out the other post.
Grapes will survive and stay green down to 26 to 28 degrees F, below that they are toast and done growing for the year. Early frosts generally do little harm except a few brown leaves at the tips of the vine.
Now onto that other post to check it out!
Hopefully the weathermen make an incorrect guess. That shouldn't hurt them if thats as low as it gets. Good luck!
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