thompson grapevine

[losse]

Hi there
Anyone know how hearty thompson grapevine is over the winter? I'm 1 hour north of Toronto, ontario 44th parallel. Do you know if that vine would survive our winters?

Thank you

[the big lebowski]

looking at your temps i see you can get down to -20 but normaly its around -4 at winter (i guess thats overnight low temps ? ) im sure that will be fine as we get around the same temps and people up my plot grow grapes outside and have no probs , it it out in the open , partial cover or in a polytunnel ?