Don't know if your parked near power or not. If so, you could go to your local auto parts store and get an in line lower radiator hose heater. Mine wouldn't start last winter on the first cold day so I picked one up for mine, it's made by KAT's. The one that fit my lower hose is model 14500 and cost about $20. Mine is parked in an unheated garage. I plug it in when I park it and even on the coldest day last winter she fired right up. I also got a magnetic heater I stick to the diesel fuel tank too.
George