I’ve grown Marion the last 3 years in 5b. It’s right up next to my house in a pretty protected spot. It dies back hard every year but it always sets a little fruit (maybe 5-15 berries) from the very bottom of the cane. I have a couple others like Logan and Columbia star that put on nice growth and die back completely. But both of those are not next to my home or sheltered. Too cold here I guess