"Does anyone have experience with how cold a Chamaerops humilis or Butia capitata can withstand without damage?" (quote with spelling corrected)

They are both limited to about -11c ( on mature palms.) roughly for brief spells. Temps should rebound close to at least zero celcius the following day. Repeated episodes are more damaging. Smaller palms wouldn't manage quite that cold. Much depends on the soil they're planted in and soil moisture. Mine are always appreciative of plenty of warm to hot summer sun.

Cheers, Barrie

Alchris,

My Euro's-chaemerops humilus are now garaged..The absolute lowest temp. they were exposed to garaged was -8C (nite-time)...a few nites straight.... with no wind chill.

They all handled to -6C (lows) this past December outside for 3-4 nites...no protection...slight wind chill...They were planted in raised beds....

I think they are easy to protect and are somewhat more wind tolerant because of their clumping format?

I am looking forward this year to finally sitting them in the damn ground where they belong!...with protection....

The butia in the picture handled the same temps but...I found the northwest wind began to beat it up...

Its garaged now and a few nites of -6C...haven't really fazed this palm or the others?

Ryan,

Thanks again...I plan on building my frame from pressure treated wood...and framing it with the panels..

Palmettoman z6-Ajax, On

http://www.imagestation.com/album/pictures.html?id=2096105644

Check this site for info on cold hard palms and evergreens.
http://www.neotropic.com/catalog/catalog_list.htm