The Growler Valley is a valley of south-central Arizona west of Ajo, Arizona.Growler Valley is a 65-mile (105-km) long valley paralleling the Growler Mountains on the east-(attached to the Little Ajo Mountains), and the Granite Mountains on the west.The Growler Wash transits the valley northwesterly, and turns west to meet the San Cristobal Wash at the north end of the Granite Mountains.