Rumney wakes early. Before the first climbers reach the crags on Rattlesnake Ridge, the valley floor is still holding its night coolness, and that is the hour Gallagher Tree Service likes best for mowing. Grass cut in that light lies down clean and holds its color through the heat that settles in the valley by noon. The work covers the yards of Rumney village and the houses set back on the hill roads — mowing, string-trimming, edging along walks and stone, and the spring and fall cleanups that bookend a mountain-town year. There is real satisfaction in a dooryard raked bare in October, squared away before the White Mountains send winter down.