Out by the dunes at Petoskey State Park the year runs on its own clock: green shows up late in May and the last mow can land in a cold October drizzle. Northern Lawn Service works the whole of that window — mowing, string trimming, edging, spring and fall cleanups — then keeps right on going once the mowers are parked, plowing drives, clearing walks and salting through the long white half of the calendar. It makes for a short offseason and a very well-known set of properties. Where the culvert sits, where the lawn drops off, which corner drifts first: that knowledge gets earned one pass at a time. And then it pays back on every trip after.