Are there hellebores out there that are actually reliable in Zone 4B (Minnesota, Twin Cities)?
I've never gardened in winters quite so harsh, but yes, there are growers in your area successful with hellebores...
Here is a link that might be useful: Minnesota
I am in WI about an hour from the Twin Cities. I have hellebores that have survived for the past 5 years, but I am afraid that I have no idea what the types are. I am not even sure where I ordered them from, but probably one of the big cheapo gardening catalogs.
I love them.