I would say if this is the first year in the ground for your palm then the cold whacked it.
I have 2-- 4-5 footers that got whacked hard -20C for 2 nights while I was away=heaters unplugged-.They have been in the ground since 07.
The damaged fronds are brownish green....I have decided to keep the heat on if it drops below 32F. Yjey should be okay..this winter was brutal..
Good luck
Palmettoman Z6-Ajax, On
That's one beauty of a palm! Wow.
I think you did the right thing watering the Trachy when you found unfrozen dry soil.
Barb
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If you drink, don't drive. Don't even putt.