Hardy palms are any of the species of palm

Arecaceae

Arecaceae or Palmae , are a family of flowering plants, the only family in the monocot order Arecales. There are roughly 202 currently known genera with around 2600 species, most of which are restricted to tropical, subtropical, and warm temperate climates...

 (Arecaceae) that are able to withstand colder temperatures and thrive in places not typically considered in the natural range for palms. Several are native to higher elevations in Asia

Asia

Asia is the world's largest and most populous continent, located primarily in the eastern and northern hemispheres. It covers 8.7% of the Earth's total surface area and with approximately 3.879 billion people, it hosts 60% of the world's current human population...

 and can tolerate hard freezes with little or no damage. Many of these species can be cultivated at high latitudes, and in places that regularly see snow

Snow

Snow is a form of precipitation within the Earth's atmosphere in the form of crystalline water ice, consisting of a multitude of snowflakes that fall from clouds. Since snow is composed of small ice particles, it is a granular material. It has an open and therefore soft structure, unless packed by...

 in winter.

The hardiest species are found in the genera Rhapidophyllum, Sabal, and Trachycarpus.