We had our first frost of the season up here on the mountain last night. Just in time for grading mid-term exams! Luckily I had covered up the tomato plants so they didn't freeze. Since it was such a cool, wet spring, my tomato plants have taken longer than usual to mature. Consequently, I have lots of large green tomatoes still to be harvested. I'm going to let them stay on the vines as long as I dare before bringing them in to finish ripening.