Install engine oil pan heater and consider a transmission heater. Make certain the blanket is the right length to go all the way around. Consider using a tiny testing light at the end of your cold weather extension cord. Change engine oil to 5W-30 or a synthetic. Change your antifreeze to 60 degrees F. Change oil, gas, and engine filters.
Belts snap easily in the cold carry a spare.
Pay for a tune up. Be certain that your battery is checked to ensure proper working order. Grease door jams. Put powdered graphite into door locks. Repack non-drive wheel bearings with Alaskan grease.