Here are some pictures of my palms, they all were outside during the winter.
Some were protected just by a roof, some with fleece and some with Christmas lights during the coldest nights (-8degrC)
W.Filifera hybride:

B.Armata

Little P.Canariensis:


W.Robusta, a lot of leaf damagage but i still cant pull the spear so ive got hope, it growed a little bit:

Double headed little T.Campestris:

Trachycarpus Martianus Khasia Hills seedling:

Greets