My citrus trees are hanging in there in the lean-to. I've been able to keep it above freezing so far. The Owari Satsuma never disappoints and I like the Meiwa Kumquat. The Trovita Orange seems to be the least cold tolerant for me. It's still recovering from what I think was trunk damage do to temps below freezing last year. It took all summer to start healing.

Here is a link that might be useful: Citrus Update