Hi Andrea,
RLBV is thought to be a Mr Etna variety that is considered cold hardy. Mine are grown in pots, sheltered in my NJ winters, and have never suffered winter die back. I am not sure how hardy they would be in ground if temperatures dropped below 30F.
There may be only one way to find out. If you were experimenting, I would just grow it in a pot for a few years and then plant it in your orchard. Then, I might give it protection for a year or two before letting it grow unprotected.
The tree is prolific and the size and quality of the fruit seems to get better each season.