Most of the cabbage family can tolerate a good bit of frost. In the UK, sprouts are grown as a winter crop and it's perfectly normal to pick them with frost on. In zone 7, I'd be inclined to just experiment and let them grow out. I bet most of them will do just fine!
Location: Graham, Washington [Zone 7b, 47.041 Latitude] 41inches average annual rainfall, cool summer drought
posted 2 years ago
That is exactly the sort of information I was looking for.
So they're just vulnerable enough to die here unsheltered, but sheltershould be sufficient to keep them alive.
I'll see what happens next winter.
EDIT: and of course NOW I casually bump into the information I wanted. Another site says they can survive down to 0F, which means I'm better off experimenting with different varieties and seeing what survives. [Of course nobody lists which varieties are more cold hardy >_<]
Here. Have a potato. I grew it in my armpit. And from my other armpit, this tiny ad: