Using the observational data of 127 meteorological stations in Ningbo from 1971 to 2020 and related data of tea production, this study analyzed the spatial distribution of early-spring frost damage on tea plants in Ningbo. Based on natural disaster risk theory, the early-spring frost risk factor set of tea plants in Ningbo was build up through the AHP (Analytic Hierarchy Process) and Expert Scoring method. By using the method of weighted index summation, we established the early-spring frost risk model, and this model was used to comprehensively assess the early-spring frost risk by years. The results showed that the annual average number of days of early-spring frost ranged from 0.23 to 21.43 days, and the distribution was characterized by low in the west and high in the east. The high-risk areas were mainly concentrated around the Siming Mountain in the south of Yuyao, the west of Ninghai and Chashan area in the northeast of Ninghai. The low-risk areas were mainly distributed in the eastern coastal area of Ningbo. From the 1970s to the 1990s, the area of low-risk and lower-risk areas basically showed an increasing trend, while the area of medium-risk and higher-risk areas showed a decreasing trend. The high-risk areas were the most in 1980s, followed by the 1990s and the least in the 1970s. The area of low-risk and medium-risk areas showed a decreasing trend, while the area of lower-risk, higher-risk and high-risk areas showed an increasing trend from the 2000s to 2010s.