Sabal zone 7
Just an FYI:
I have a young Sabal minor 'Emerald Island Giant' that started as a seedling about 3 years ago. It is a very slow growing variety and last season it started to push fan-shaped leaves.
I decided to leave it out all winter this year, in it's pot. It is under an awning so it did not benefit from the protective effect of all the snow we've had.
In any event...I just took a peak at it, and it looks perfectly healthy, no spear pull, no apparent damage to the plant. This despite temps down to 5-6F and unusual cold...and in a pot, where they say that an extra hardiness zone is lost.
I also have a Trachy wagnerianus overgrown in a 5-gal that appears unscathed, along with Yucca rostrata and 2 Agave ovatifolia, which all are looking good.
Come warmer weather, I will provide an update if/ when growth begins.