Also available from Mountain Valley Growers, who list the hardiness as zone 5-11. I'm a bit skeptical about zone 5, given that it was bred in Visalia, CA.

Edited to say that this rose is also being offered by High Country Roses, whom I do trust. If HCR says it is hardy in zone 5, it must be so. There does remain the question of soil composition. Zone 5 in the lighter, often volcanic soils in the western USA is quite a different terroir than the damp, dense heavy clay loam over yellow clay in my yard.