Cold hardiness of mulberry graftages was examined with two varieties, Kaeryangppong and Keomseolppong in early December. Exposure temperatures were three levels (-5, -10 and -15$^{circ}C$) at the 4 exposure times (6, 12, 24 and 48 hrs). No damage showed at -5$^{circ}C$ for 48 hrs. Survival rate decreased sharply from -10$^{circ}C$, regardless exposure times. There was no survivals from -10$^{circ}C$ for 12 hrs in Kaeryangppmong and from -15$^{circ}C$ for 6 hrs in Keomseolppong. This suggested Keomseolppong was stronger in cold than kaeryangppong. Regrowth decreased drastically from -10$^{circ}C$.