I got a chance to check out my cold frame today, as I brought a bucket of kitchen compost out to the bin behind the gardens. I haven't had a chance to look at it lately; weekdays I don't have any time when there's enough light to see, and weekends have been busy.
The verdict: Better luck next time. The blast of winds, below zero temperatures, and snowfall resulted in the window pane falling and shattering all over the plants. I can't even lift up the two layers of plastic that cover the frame; they are frozen to the sides of the frame or the soil, I can't even tell which. I can see a couple of the lettuce plants, and they are frozen solid.
Oh well. At least I can take a break from gardening for a month or so now.