Thank you Eric for those lists. That is pretty much my experience in 9b Northeast FL. My low was 23 degrees last winter. Based on my experience I will add these palms to your " Good hardy palms" Brahea dulcis Brahea nitida Calamus caryotoides ( low 20s in CA and anxious to try in FL) Caryota gigas (under canopy, my hardiest caryota) Chamaedorea radicalis Chrysalidocarpus decipiens (summer is the problem with this one) Chuniophoenix nana Phoenix pusilla Syagrus campylospatha Syagrus (Lytocaryum) hoehnei Trachycarpus fortunei Trachycarpus latisectus Trachycarpus wagnerianus To add to the second category "more cold sensitive palms for protected locations" Allagoptera (Polyandrococcos) caudescens Chamaedorea elegans Chamaedorea cataractarum Chamaedorea klotzschiana Ravanea glauca (R. glauca has shown no damage under canopy in winters with 25 degrees low temp, where R. rivularis has taken a big hit) Pseudophoenix sargentii (my neighbor had one under oak canopy for 10+ years, it died last winter. It was trunking, overall height of 10 feet) My little totally exposed 12 inch tall plant recovered)