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Recently, the frequency of extreme flood has been increasing due to climate change. With unexpectedly heavy rains, the agricultural reservoirs constructed several decades ago might be in danger of overflow or dam-break. The objective of this study was to assess the hydrologic safety of agricultural reservoirs under climate change. Five agricultural reservoirs on the Young-san River of Korea, constructed before 1977, were selected as study sites. The precipitation data for the future, based on the climate change scenarios such as RCP 4.5 and 8.5 and RCM HadGEM3, were obtained from KMA (Korea Meteorological Administration) in order to predict the hourly reservoir inflows using the HEC-HMS (The Hydrologic Engineering Centers Hydrologic Modeling System) model. The design floods obtained from the model were compared with flood capacity of each reservoir to evaluate the hydrologic safety.