That pie cherry tree special looks interesting, but it does list worst zone 5, and I live in 4 to 4.5, opinion?
I’m in Zone 4, but have a south facing area where all of my fruit trees are planted. I have four cherry trees; sour and sweet, and all are doing just fine.
There is protection from a big old evergreen treeline on the west, and I do keep the trunks wrapped with spirals to protect them from the bunnies.
So far, so good. Had a HUGE cherry crop last year - enough for two whole pies, LOL! (The trees are only about 3 years old.)