There are several cultivars which have been reported to be winter hardy to at least zone 6....possibly even 5, although I have never tried it personally in that cold a zone so can't speak from firsthand experience :-). 'Arp' (considered the most cold hardy and is widely sold), 'Madeline Hill' (aka Hill Hardy, Hilltop, etc.), 'Alcade' and 'Athens Blue Spires'.

If attempting these in a colder zone, I'd for sure plant one in the ground to test. Just make sure it is an area that receives plenty of sun in summer and has very well drained soil. If growing one in a container, you will need to provide winter protection (containers experience much greater cold exposure than does an inground plant) so will either need to heel in or bury the container in the soil for the winter or bring indoors into a cool, bright location.

IME, rosemary is very tricky to winter over successfuly indoors....it is not really a houseplant and dislikes indoor conditions. But no guarantees that it could survive a polar vortex episode like what much of the country is experiencing now in the ground regardless!

Rosemary grown from seed won't be a named cultivar. I googled Vermont bean and they apppear to be selling plants.

Do you have somewhere very light, very cool, not with dry air and not often going much below freezing? Something like a glass porch? That's what Rosemary would like in winter.

Oh I misread the Bean site. I'll order two to try - one to put in the ground and the other in a container that I will overwinter in a guest house kept at 50 most of the winter..

When we lived outside Philly, I bought a rosemary plant at the local garden center. It didn't have a cultivar name, but I assumed it was meant to be planted in the ground there. It was remarkably tolerant of indoor conditions, and usually bloomed about this time, inside. Unforunately, I lost it one winter to a combination of underwatering and being potbound. This summer, I bought an Arp from Catskill Native Nursery. It has survived so far, but isn't particularly happy in the dining room. Given the current outside conditions, getting it out of the house isn't an option. The Philly one was happy in its pot at temperatures close to zero, so I was planning on keeping this one out for much of the winter. Maybe it can go out in February.

I have a 3-year old rosemary that comes inside each winter. If rosemary doesn’t like house conditions, I suggest neglect, which seems to suit my indoor rosemary well. I have no idea why. But, it is nice and healthy. It’s my way of keeping rosemary all year round.