Winter dawn in West Hatfield comes up cold and pink behind the ridge, and the Mill River steams where it has not frozen over. Spring Valley Landscaping Inc. is out ahead of it — plowing driveways, cutting walkways through to the door, sanding and salting the shaded stretches that stay treacherous all day. When the ground finally lets go, the same attention shifts to grass: cleanups, mowing, trimming, edging, weekly upkeep from the first green through the last leaf. The valley hands you both extremes and not much in between. Meeting each one on time is the entire point.