This study aimed to evaluate the vulnerability of climate impacts on the forage crop Sorghum×Sudangrass hybrid (SX-17) in central Korea and to identify critical climate factors influencing its productivity. Field trials were conducted in Chungju (Chungcheongbuk-do) and Cheongyang (Chungcheongnam-do) from 2017 to 2018. Climate impact vulnerability was assessed using the index defined by the Rural Development Administration, with temperature and precipitation data provided by the Korea Meteorological Administration. The fresh and dry matter yields in 2018 significantly declined compared to 2017, primarily due to high temperatures and drought stress. Both regions exhibited increasing trends in climate vulnerability since 2010, reaching a peak value of 0.7 in 2018. These findings highlight the detrimental effects of extreme weather on forage crop productivity and suggest that climate impact vulnerability assessments can provide crucial baseline data for developing effective agricultural adaptation strategies under climate change scenarios.