Had to buy a new group 26R battery for my tractor yesterday. I probably should have tried to find a slightly larger group size that would still fit, but oh well. She didn't want to crank well at anything under 15 degrees or so.
OldPath, I can think of several good reasons to start a tractor in the single digits, but the main one around here lately is to plow the driveway. As long as it ain't too windy, who cares what the temperature number is. Just bundle up and cover your face if you really have to. -13f this morning, I could sure feel that when gathering firewood from the screen porch in my PJs to stoke the woodstove.