Ensure snow is wiped off LED lightbulbs, because as they are low energy, they won’t usually give off enough heat to melt the snow, unlike halogen bulbs.
The freeze, thaw effect of frosts can cause buried wires to be pushed up out of the ground. So do check and, if necessary, bury them again before the ground freezes. If you notice damaged wires or exposed copper, have a qualified electrician come out to repair; do not try to do this yourself.
Check bulbs. If any bulbs have stopped working, replace as soon as you can because the voltage not being used by the ‘dead’ bulb will be used by the remaining bulbs. This results in excessive voltage going to them can in turn shorten their lifespan.