I know that several vineyards in northern Georgia counties have experienced some cold damage; additional damage may come this evening. Mark Hoffman (North Carolina State) has provided some information that you may find to be of value. See the link below:
In addition, this blog does have several past posts that may be of value to you for review.
Bud break and risk of frost / freeze damage (March 20 2018)
Frost (again) and its management (April 25 2018)
Response to Cold-damaged Vines (May 19 2020)