Mount Jefferson State Natural Area is a 1,188-acre (4.81 km2) North Carolina state park in Ashe County, North Carolina in the United States. Located near Jefferson, North Carolina, it includes the peak of Mount Jefferson, named for Thomas Jefferson and his father Peter, who owned land nearby and surveyed the North Carolina-Virginia border in 1749. In 1974, Mount Jefferson State Natural Area was designated as a National Natural Landmark by the National Park Service.