First settled in 1753 by the Lynde family, the town was known as Lyndeborough Addition. The Monadnock hills cut residents off from church and school, so in 1791 they petitioned for the right to form their own town. The name was chosen to indicate the town's location on a level, fertile ground between the hills. Greenfield is home to the Crotched Mountain Foundation, a rehabilitation center for handicapped children; the Crotched Mountain Ski Area; and Greenfield State Park, on Otter Lake.