Try growing Rhapidophylum hystrix ,Trachycarpus Takil ,those are just a couple of examples. Type in your search bar cold hady palm trees and you will find lots of info on growing cold hardy palms. Here also is a site that other cold hardy people talk palms and more www.palmsnorth.com .Try also cold hardy Yucca plants I think you will find some these to be even more cold hady than palms.