I am planning a trip to the UP of Michigan later part of next month. Does
anyone know of any wineries in that region making wine from the Frontenac
Grape? Also, has anyone planted any Frontenac south of the cold regions
like Minnessota? From what I have read, it produces a good brix and seems
to be fairly disease resistant.

I don't know of any wineries but I live in North Central Wisconsin and I
planted some Frontenac Gris this year. The plants are doing quite well in
spite of the heat but I won't know until next year how well they will
produce etc.