The Last Frost?

This morning we awoke to a chilly morning. The temperature outside read 34 degrees but the water in all of the bird baths was frozen. Later, when I spoke to a friend in the Dahlia Society, she told me that she had left a tray of young dahlia plants outside, overnight. This morning some of them had died. So even in town there was a killing frost. The question is, will this be the last frost of Spring?