At four in the morning the Connecticut River is a black seam under the Ledyard Bridge, and Hanover is still asleep under six new inches. Grindstone Home Services LLC is already out — plowing driveways, clearing walks, laying down sand and salt so the first car of the day pulls out without a second thought. Come May the same properties want mowing, trimming, edging, and the cleanups that follow an Upper Valley winter's worth of grit and broken branch. That is a good pairing to be part of: a dooryard scraped to pavement before sunrise, then that same dooryard green and squared off in June. From Etna village to the streets off the Green, the routes get learned by heart. Weather picks the hour; the work stays the same.