cover 3/4 of the radiator with some corrugated plastic cardboard. political signs work well. regular card board works in a pinch
change oil in all your running gear to synthetic for cold weather
and as stated, plug it in always. When it's not tooo cold you could put the plug on a timer to save some energy, have it turn on 1hr before your commute. If it's bitter cold plug it in always and blanket the engine and have a battery warmer
winter blend fuel can gel too, had it happen when I got 60 below zero up north in Canada, lot of trucks were gelling that week for sure even with winter blend. If that polar vortex comes down and you get a freakish cold snap add more anti-gel for good measure, and carry spare fuel filter.
oh and make sure you have good radiator fluid, radiators will freeze up fast if you have old or improperly blended fluid, then you'll overheat your engine.