For those of your that receive the APS bulletin and live in more Southern climes there are a couple of new cultivars that were registered that would be good for you. Part of the registration "Recommended for landscape use only in regions that do not experience hash cold fronts during spring warm up". Perhaps Don H. can provide some additional information since they are new ones of his.
I have long been of the mindset that there should be a way to provide information on which peonies, probably other plants, that are more succeptable to colder temperatures and at which time they are more succeptable.