I found this interesting. Wonder if any are on this board. I'll be curious of the results. 

https://www.theglobeandmail.com/amp/canada/article-halifax-to-test-resilience-of-palm-trees-in-pretty-harsh-winter-2/?__twitter_impression=true

After looking at the climate averages for Halifax, it seems like the dips below 0F will knock out the windmills and the lack of summer heat will be the demise of the needle palms.  Unfortunate if they don't protect them.

Wow. Good for them. But I hope they protect them. All palms here in Ontario need winter protection 

There is no way on earth any palm will live in Halifax.  

Halifax is 6b same As me which is further south and im in southern  Ontario. But I’m in between the Great Lakes. Palms survive in colder zones than ours no problem with proper protection (trachycarpus)

They won't live without extreme amounts of protection, which isn't living outside.  

Zone 6b in Halifax, NS is nothing like zone 9a in Victoria, BC.  The east coast of Canada is nothing like the greenhouse effect winter warmth of Canada's West coast, sandwiched between mountains and ocean.

The article mentions Palms in British Columbia and explains why Halifax is a stretch for long-term survival of any of the Palms planted in that park in Dartmouth, NS.  Even Ontario has a patch of zone 7a, but I don't think much warmer than 6a exists anywhere in Nova Scotia, based on climate maps.

Halifax has a reputation for being the "slush" capital of Canada in winter (wet, slushy snow that runs everywhere).  By comparison, it only snows about once every five years in places like Victoria, BC.  One climate is hospitable to cold-hardy palm trees.  The other isn't. However, it does sound as though the park is planning to protect some of the Palms in winter.  I got the impression that the Butia/Pindo will be spending winter indoors.