The frost damage could be severe throughout Yavapai County. It looks like the greatest danger is tonight and tomorrow, but you should check your local weather throughout the weekend and into early next week.
Make sure to hydrate plants tonight ASAP and cover with a breathable material. If possible, bring new plants next to the house or under cover. Protect tomatoes, squash, basil, zinnia and other tender plants.
The Warning is for Prescott, Chino Valley and Prescott Valley.