Patinopecten yessoensis is known to be farmed only in the northern part of the East Sea today. In an attempt to extend its production area, we have conducted experiments both in the northern and southern parts of the East Sea and studied on their growth in an aim to use the results for increasing overall productivity of the species. Early juvenile scallops producted in February 2014 showed an average shell length of 0.23 ± 0.002. The high growth group showed an average shell length and shell height of 4.11 ± 0.08 mm and 4.28 ± 0.09 mm, respectively, in June while they were 23.63 ± 3.4 mm and 24.19 ± 4.5 mm in October. The low growth group showed an average shell length and shell height of 2.23 ± 0.7 mm and 1.99 ± 0.9 mm, respectively, in June while they were 17.06 ± 3.4 mm and 17.59 ± 4.5 mm in October. The daily growth rate of the high growth group was 0.037 mm/day and 0.027 mm/day for the low growth group. In August, we measured the shell length of Patinopecten yessoensis from Yangyang-gun, Gangneung-si, Yeongdeok-gun, and Pohang-si. Patinopecten yessoensis from Pohang-si showed the best growth performance with its shell length of 26.90 ± 3.6 mm. Patinopecten yessoensis from Yeongdeok was the second largest with its shell length of 23.56 ± 3.4 mm. We presume that optimal water temperature and phytoplankton abundance of the two regions have contributed to the good growth performance of the species.