Trachycarpus fortunei MSI
This palm cannot tolerate 0F, but has been known to survive 5F without significant leaf damage, as long as the low was only brief. Seedlings of this species are not nearly as hardy, however, and can be damaged at 10F. This palm is grown all along the western coast of the US up into Canada, and seeing snow on it without leaf damage is not unusual. This is not the most ideal palm for tropical climates, so its hardiness may be viewed differently in a cold, humid climate.