Pyeongchang region was ruled by the Goguryeo Dynasty during the Three Kingdoms period, and it was called Uk-o-hyeon (욱오현). After the Silla dynasty conquered the Goguryeo Dynasty and Baekje Dynasty, it was renamed Baek-o-hyeon (백오현).
After the Goryeo Dynasty was established, it renamed Pyeongchang-hyeon. Then, it was under control of Wonju. When a 10-provincial system was enforced, the north of Pyeongchang region was involved in Sakbang-do, and the south of the region was involved in Jungwon-do. When a new administrative system was carried out by King Hyeonjong, the east of the region was involved in Dong-gyeo, and the rest of it was included in Yanggwang-do. An administrator for the region was sent from the central government, and it became independent of Wonju in 1299.
When the Joseon Dynasty was founded in 1392, the region was promoted from a hyeon to a county (gun). After the territory was divided into 8 Provinces under the reign of King Taejong, it was involved in Gangwon-do. After the territory was divided into 23 districts in 1895 with the 8-provincial system abolished, it was included in Chugju-bu. When a 13-provincial system was enacted in 1896, it was involved in Gangwon-do.