Elkwood is an unincorporated community in Culpeper County, Virginia, United States. Elkwood is located on U.S. Route 15 8.1 miles east-northeast of Culpeper. Elkwood has a post office with ZIP code 22718.The climate in this area is characterized by hot, humid summers and generally mild to cool winters. According to the Köppen Climate Classification system, Elkwood has a humid subtropical climate, abbreviated "Cfa" on climate maps.