The Pemigewasset runs cold and quick through Thornton, and when June finally settles into the valley the grass makes up for lost time. BKRlawncareservices keeps pace with it — mowing, trimming, edging, week over week through a mountain summer that never feels long enough. Riverside yards and roadside lots off Route 175 grow in bursts after the afternoon storms slide off the ridges. Spring cleanup here is mostly sand, sticks and whatever the plows pushed into the turf; fall cleanup is birch and maple leaf, gathered up before the first snow pins it down. In between, a neatly cut lawn set against all that mountain green is a fine thing to pull into.