First Hard Frost?

Well, we had another frost on A.D. 2009 October 02. This time the temperature was 33 degrees Fahrenheit and somewhere between 50 and 85 percent of the lawn was crunchy from ice. I decided that I would call it a "hard" (killing) frost if the tomatoes were dead when I got home. Well, two of the four lost their tops, and all of them had a little browning at their leaf tips. My wife says that constitutes a killing frost, but I was hoping for something a little more definitive. I'm still thinking about what to call it...