My almost 2 and a half meter tall(in total) ''Blue Java'' just lost its leaf blades from a day arround 0C with snow and -1C or a little more below 0 overnight. The pseudostem and even petioles seem perfectly ok but we will have to see...Anyway,i thought it did pretty well considering it withstood a snowstorm! But its much bigger than the one you are overwintering. I too would suggest to pot it up and bring it indoors unless you can give it above 20C during normal days and keep it above 0C during the extreemly bad ones...
I wish you success!
