An ice storm on Guard Hill glazes everything at once — the road, the rail, and the last twenty feet of driveway that decides whether you are going anywhere. M & Z Tree Care and Landscaping Service runs snow work through nights like that: clearing drives and lots, breaking open the walks and steps, and laying sand and salt on the pitches that hold shade all day long. Northern Westchester weather likes to hand you snow, then rain, then a hard freeze before dawn, and each layer needs its own answer. Getting there early is most of the job; getting the edges is the rest of it. Coverage runs across Mount Kisco, Bedford, Katonah and Armonk.