I live in the Pacific Northwest near Puget Sound, zone 8. I have not had any problem growing grapes (a perennial vine) through freezes or snow - these are all 30+ years old.. Most vineyards in my area grow grapes on shorter espalier type wire supports, but mine are grown for both the fruit and as a garden feature and I like the look of a taller trellis. I prune these back quite severely in early spring, and several times during the growing season. Unfortunately all of my grapes are NOIDs, which makes it more difficult to utilize the fruit. Mostly we eat them off the vine and/or toss them to the chickens, who love them. Last season yielded a particularly robust crop, not sure why, perhaps the warmer summer temps.
