Before it gets to cold it might be a good idea to change your fuel filters as not only does fuel gel but the waxes in it harden in the cold along with any water in the fuel will freeze, your fuel filter in your engine bay should have a water drain on it so you can see how much water and crud is in there.
The reasons why diesels don't like cold weather is a long list and any one thing on that list will keep it from running so while you still can, go from head to toe and make sure everything is right.
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