Good, Wi-Sunflower answered the question about Brussel Sprouts and below freezing weather. Mine get damaged at about 10-15 F and killed in the low single digits (we have no snow cover to insulate). Cabbages and other brassicas, in my experience, are a little less hearty. I don't even try to pick BS until after a heavy frost or light freeze.
We will get down to around zero tonight and tomorrow night and I think that spells doom for the remainder of my fall garden.