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:

https://grapes.ces.ncsu.edu/2021/03/awis-weather-forecast-widespread-freeze-2/?src=rss

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)

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