|Petersen Rock Garden, which has state-wide significance, is eligible for listing in the National Register of Historic Places under Criterion C in the areas of Art and Landscape Architecture, as a folk art environment, for its significance as an exceptional work of art that combines architecture, landscape, art, and sculpture in a unified whole. Located approximately eight miles southwest of Redmond, Oregon, the work recalls European and American grotto traditions, juxtaposed with American iconography and vernacular folk art traditions, through the creativity and artistry of Danish immigrant Rasmus Christian Petersen. Petersen, who began constructing the garden after finishing his education in Danish and American culture at Nysted Folk High School in Nebraska and three successful decades of farming, was also influenced by his homestead's setting in central Oregon, with its dramatic views of the Cascade range . Creation of the garden represents the last chapter in Petersen's life. The gardens are all the more remarkable for their unexpectedness in the desert landscape and their lack of precedent in their creator's life. The Period of Significance for the site is 1927, the date of construction of the Petersen's residence, to 1952, the date of Petersen's death. The gardens and property as a whole retain excellent integrity and easily convey the reasons for their significance.