The High Line Canal draws its long green thread across Aurora, and the neighborhoods that grew up beside it inherited its cottonwood shade. Mow Masters LLC works those lawns in the early hours, while the canal path is still cool and the sprinklers are still ticking. Mowing on the high plains is a negotiation with sun — a mile of altitude puts an edge on the light, and grass here earns every inch it holds. So the cut is set high, the passes are laid straight, and the edge along the walk comes up clean enough to run a hand down. By the time the afternoon glare arrives, the yard is already finished and quietly holding its own.