September light on the Peconic Bay side of Southold goes long and coppery, and the lawns hold their color weeks after the last beach umbrella comes down. CMaster landscaping keeps those yards through the whole stretch — weekly mowing, edging, trimming and the cleanups that open and close the year. Grass grown on North Fork sand wants a steady hand and a regular visit rather than a heavy one. What lasts is the finish: an even cut, a clean line where lawn meets drive, a property that composes itself from the road. Southold anchors the route, with Peconic, Cutchogue, New Suffolk and Greenport nearby.