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While some post how hard it is to start their tractor, and others post how easy it is to start theirs's in cold weather, fact is all gasoline engines (diesel's for that matter too) do not start as easy in cold weather as they do in hot / warm weather.
A lot of things contribute to this. First off the condition of all
operating system is more important than ever in cold weather. Bruce(VA)'s lengthy and detailed reply to your earlier post HERE
outlines a lot of these points. The importance of every system being up to snuff cannot be underestimated.
Automotive batteries do not like very cold weather. This reduces the cranking speed and also reduces the voltage to the ignition system. Keeping a tractor in a warm area helps immensely (as would removing the battery from the tractor and storing in a warm area until ready to use).
Another has to do with the fuel not vaporizing the the same in cold weather, thus making it harder to ignite.
The cold weather brings out all the problems that do not affect starting in warm weather as much.
With that being said, they can and will start in cold weather when evrything is in good shape.