MEDITERRANEAN FAN PALM, Chamerops humilis. Med fans are cold hardy to 16-17 degrees – and thought to be hardy as low as 0 degrees. I do know that they suffered little damage in Dallas during the winter of 2010 – and those temps dropped into single digits!
WINDMILL PALM, Tracycarpus fortunii. Unscathed or minor damage at 10 degrees; thought to be hardy to at least 0 degrees.
CHINESE FAN PALM, Livistona chinensis.
Thought to be hardy to 20 degrees.
PINDO PALMS, Butia capitata. No damage to 14 degrees; thought to be hardy to 10 degrees.
TRUE (or EDIBLE) DATE PALM, Phoenix dactylifera. Some people call this palm a Mejool (Mejool is a type of dactylifera). Damaged but recovered at 19 degrees.
ROEBELLENII OR PYGMY DATE PALM, Phoenix roebellenii. Minimum temperature with no damage is 25 degrees – but it has been my personal experience that the fronds will burn at temperatures in the upper 20s. The damage will be almost unnoticable by early summer.
QUEEN PALM OR COCUS PLUMOSA, Syagrus romanzoffiana. Damaged by recovered at 24 degrees.
CUBAN ROYAL PALM, Roystonea regia. Hardy to 28 degrees. This palm only puts on a set or two of fronds each year – you may think it is dead after a hard freeze. Be patient and, if you are unsure, give it until late summer to recover.
TEXAS SABAL, Sabal texana or Sabal mexicana. Hardy to at least 5 degrees and reported to survive sub-zero temperatures. This is the only palm tree native to the Rio Grande Valley (translation: no fuss, no muss)
CLUSTERING FISHTAIL PALM, Caryota mitis. Hardy to 28 degrees. My personal experience is that the fronds will burn at this temp – but the tree is unharmed. It is very slow to grow its first set of fronds after a freeze. Mine took 8 months last year – and I can’t tell you how many times we nearly yanked it out.
CALIFORNIA FAN PALM, Washingtonia filifera. Little or no problem at 15 degrees. Thought to be hardy to 0 degrees.
MEXICAN FAN PALM, Washingtonia robusta. Variable damage below 22 degrees; hardy to about 20 degrees.
PAUROTIS OR EVERGLADES PALM, Acoelorrhaphe wrightii. Variable leaf damage at 22 degrees; root hardy to at least 15 degrees.
BISMARK PALM, Bismarckia noblis. Hardy to 28 degrees.
All of the temperatures given are from Betrock’s Cold Hardy Palms.