It seems your winter hardiness zone in Solvang is 8b (which only means that your annual winter minimum temp is on average 20-25 degrees F.

But, since you are in the West, more clout and reference is given to your Sunset Climate Zone, which seems to be Zone 14 [California's Inland Areas with some Ocean Influence], although depending on your elevation and if you're on the west or northwest side of Solvang (toward Buellton) you could be Sunset Zone 15 [Chilly Winters along the Coastal Range].