The national weather service issues a frost advisory when temperatures are predicted to be between 33 and 36°F. When you know there is a frost coming, you don’t need to worry about perennials that are hardy in your area. They can handle frost just fine. And you don’t need to worry about cold Hardy annuals like carrots and spinach and kale, they survive in cold temperatures and a frost doesn’t bother them. but for tender, annuals or warm season annuals like dahlias, tomatoes, basil, zinnias sunfl