Am no expert, but my understanding is that it would likely be those temperatures. however as long as the roots didn't freeze, it should come back from underground. It could not appear until later in the season so be patient.

i Had brown turkey in NYC zone 7 most years it made it thry with no problems but If wee had a cold winter (-20's f ) it would die back to the roots and take 1 year to grow back with only a little harvest that year , we never wrapped it
my naboors had clone from my plant and wrapped it in Fiberglas insulation and never lost any

"Am no expert, but my understanding is that it would likely be those
temperatures. however as long as the roots didn't freeze, it should come
back from underground. It could not appear until later in the season
so be patient."

Thanks. Oh, some of the branches have already started to leave out, but some look dead as well.

"i Had brown turkey in NYC zone 7 most years it made it thry with no
problems but If wee had a cold winter (-20's f )"

NYC gets that cold? Really? I thought it rarely got below 0 F.?

"my naboors had clone from my plant and wrapped it in Fiberglas insulation and never lost any."

That's good. I guess the smaller the tree, the easier that is to do.