Hazelnut - I am in zone 9a here in California and have good luck with both tree peonies and herbaceous ones. We get maybe 10-14 days of freezing temp, but that seems to be enough for the ones that I have. I have about 50 different varieties, and they normally bloom. A few skip a year here and there, but the tree peonies bloom every year.
Have you tried before and not been successful?
