Whether frozen is the word or snowfall on the forecast, think visibility above all.
As a first step, if your car sleeps outside, make sure that visibility is assured.
Clear the snow on the headlamp optics and tail lights; and clear the snow and/or ice over the entire windscreen, front and rear windows. Do not leave before making sure that no blind spots are left unchecked. Especially if it’s still dark. Quick tip: Keep an eye on your wiper blades. They can be frozen and glued to the windshield. Do not operate them until you have warmed up your windscreen (inside heater) as this may damage the rubber of the brush.