For non avalanche terrain It all depends on the run. Many runs are never groomed and skied in, some boot packed, others will get track packed(cat with tiller up/or off)then once more snow comes it'll hold it better, track packing also helps gather more snow as well. Others will be man made, then dozed out, then tilled and opened, others may only need enough man made to fill in water bars, sink holes, road crossings or high traffic areas.
