Q.Peach Tree Buds
I live in the Austin, TX area. My three year old peach tree has buds but they are grey. It is now March. Are they dead? What should I do?

Excess cold certainly can kill off the buds. The article below will help you determine the health of the buds and tree.
https://extension.psu.edu/plants/tree-fruit/news/2015/assessing-low-temperature-injury-in-peach
I would also encourage you to contact your County Extension Office. They will have information on temperatures and the effects on the local plant material. Also if you have tree damage, they can use this information to help other gardeners.
Here is a link to help you locate your nearest office.
https://www.gardeningknowhow.com/extension-search/