We've had great luck growing lettuce over the winter so far this year, despite the temps dropping into the teens on many nights. We cover it with a thin, woven, white cloth the locals call "tobacco cloth," which the farmers use to cover their tobacco seedlings as they grow. It lets the light and water in, but keeps the cold out, at least enough that it doesn't damage the entire plant, only a little bit around some of the edges.
Perhaps next year I'll try planting iceberg lettuce, which is more suitable for cooler weather.
Rabbits cookin' coffee -- that's what the locals call it. But here in this little hollow in East Tennessee, when the hills surrender their misty hostage to reveal the stalwart cedars growing by the stream in our pasture, I know there is no place on earth I would rather be. The welcome mat is out! Come and sit on the porch and chat with me awhile!