By mid-October the ash and elm along Derby's older blocks give up all at once, and a yard can go from green to ankle-deep overnight. Prestige Lawn Care, LLC follows that turn through the neighborhood — mowers dropped to the last low cut of the year, leaves hauled off the turf before the first hard freeze welds them down, beds put away for winter. West of here the foothills stack up toward Mount Blue Sky, and autumn light comes in long and gold across the flats, which is a fine thing to work in. Spring brings the other half of the job: aeration, overseeding, and the first mow that wakes an entire street up. A kept lawn on a plains block is a small, stubborn kind of hospitality.