I'm located in 6A WV and have 6 Brunswick pots. I thought about putting one or two of them directly in the ground and seeing how well they do. They are still small so I'd likely garage them this winter and plant them early next spring.

I have 5 other varieties but only one of each so I'd rather not risk losing any single plant until I can get more cutting rooted next year.

So how much cold can Brunswick hamdle?

Over here in PNW, I have never protected my Brunswick. It is still in its 1 gal pot
and the tree is at least 6ft tall well branched with roots rupturing its 1 gal pot. My tree
is likely over 7 yrs old. 

Note -- I think U have longer periods of cold weather than southern PNW. If so, it would
most likely kill it.

I dont have personal experience with Brunswick, but in Europe in Bulgaria this is the only fig which is growing in the cold mountains of Bulgaria next to the Michurinska 10. So i think it has to be minimum as hardy as a normal fig, but in my opinion it might be hardier a little bit.

Here, after -15c and 10 days permanent under 0c temperatures – one year growth is gone. Next season fruited normally.

Thanks.  I have 6 of them so it cant hurt to put a couple in the ground and see how they do.  For the sake of winter survival is it advantageous to grow the fig in tree form or bush form?

Interesting topic. I have 4 in pots that made it in an unheated garage with no die back last year but so did all the other figs. I recently bought a Texas Ever bearing from home Depot and I think it is a brunswick of some shor also. The main trunk had died back (1 1/4 inch rhick)but has good new growth on it and main crop showing. It is at least 4 years old and came from Tennessee. I will put two of the four inground and leave the rest in pots to ensure a couple of breebas. Overall excellent fig.