Thanks everyone, been away for a while, sorry for no response. The yard is indeed protected from the north side a bit, but the buildings aren't very high. I was thinking about some mulch, but decided to wait for the soil to warm up and put it later. The rains are rare guests here, so it should be helpful.
Some images:
5F aftermath repost

and here's the trachy after a week of below freezing and 18F as a low temp.:

The boxes at the work. No better pics of them, sorry, I'll take them tomorrow, and closer.

Hi Yuri,

Thanks for the picks. Question: did you put something around your plants before putting the boxes above them? I have never overwintered a palm, so I am starting to be anxious, now that I have only 5 months left... 🙂

Thanks again!
Rob