The thing is though, lettuce is supposed to be planted in late March in this area. If you plant lettuce now, it's way too late of a start since it will be maturing in weather that's too warm. Maybe leaf lettuce is more vulnerable, but I've never had a problem with my romaine lettuce plants taking a frost/freeze. I was just outside and they still look great after last last night's freeze. No problem for the broccoli, peas and radishes as well. I did water very well yesterday. My lettuce is just about ready and I'm gonna pick some today.