Greeley wakes early in June, and the sound that arrives with the light is a mower finding its first line of the day. Aaron's Lawn Service works the lawns of this Weld County town, where cottonwood shade and watered bluegrass hold their green against a dry high-plains summer. Mowing, edging, trimming, seasonal cleanups — the work is simple to name and satisfying to see: a straight edge along the walk, clippings gone, a yard that reads well from the street. Around Glenmere Park the old trees drop seed in spring and leaves in fall, and every lawn nearby keeps its own calendar because of it. Aaron's keeps that calendar for homes in Greeley and out toward Evans and Garden City.