By two o'clock on a July afternoon the sky over the western fields starts stacking itself up, white going to gray, and every mower in the county is racing the same clock. Coles Lawn Service LLC cuts, trims and edges lawns in Sandusky, running the weekly route so the grass never gets ahead of anybody. A yard finished just before the rain arrives holds its stripes bright and dark under the first drops, clippings blown off the drive, the border along the bed cut sharp. Spring and fall cleanups round out the calendar at either end. Sandusky and the nearby Sanilac County towns make up the week.