I planted 'Jersey Beauty' here in the Mohawk Valley in about 2011. It did not survive the cold winter, temps down to -20F. With the warming climate, I am wondering if I might be able to grow it again.

I very much doubt it is hardy to 4b or even 5a. On the list of gardens in which JB grows I saw only one, in Poland, in which JB might be subjected to winter cold. Maybe zone 5 with protection, maybe if grafted onto multiflora, but not 4 I would think.