my tractor is a 2010 Ct 230, I live in Northern Ontario, Mine will start at -20 C or -4F, without being plugged in, but I do not recommend this. and it's in a shed without heat, last week it was -42 c or -44 F and it started, but I have the biggest battery i could put in the front and like I said it'sI always try to pluged in, I still don't like starting it that way.
what I want to do next year is install 2 quick coupler on the rad hose, I have an old 1977 Scout international that always start's, its my plow truck. I will also install quick coupler on this scout, couple the 2 vehicle together, start the scout, wait till it is hot, this way the hot water goes from the scout to the Bob cat, then start the tractor and un couple my quick coupler,
,but be careful do this with both machine cold, so couple before you start the donner car
if not for example the motor from the scout will cool down very fast and this could damage my scout,
it's an old trick lumber jacks do around her to start the machines in the bush, but unfortunately they couple when they get to the bush, it warms up their machine very fast but may also damage their vehicles,
In a perfect world I would have a very big garage, so I could keep my equipment in a hot garage.. ah Dreams. I have to get my Minister of Finance to approve, any idea on how I can get HER to say yes to a garage?

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