Robust tomato plants

So far, this Market Miracle tomato plant has lived despite my neglect. I decided to put the plant outside because I believed we were in for a week's worth of above-freezing temperatures but I was wrong. This plant, along with a Brandywine tomato plant, has lived through at least 3 nights of sub-freezing and windy conditions. I expected them to be dead when I came home from work today but they were still alive so I brought them into the house for a well deserved break.