By late September the cottonwoods along Niver Creek turn all at once, and half of Northglenn wakes to a yard that needs raking. Arbol De Fuego Services keeps pace with it — mowing, trimming, edging, leaf and yard-waste cleanup, and the autumn feeding that sends a lawn into winter with something in reserve. Come spring the same hands cut back what the cold broke and get the beds in order before the first warm week gets ahead of everybody. It is steady outdoor work on the high plains north of Denver, where the light stays long and gold well past supper. Yards in Thornton, Broomfield and Westminster fall into the same round.