A fattening cultivation of beef cattle in the Province of North Sulawesi is managed by the backyard farming, characterized by a lower productivity, small-scaled business, and traditional management. This type of business has become priority to satisfy the need of beef consumption. Then, the objective of this research is to analyze the extent of technical efficiency of beef cattle fattening. In detail, data collection was conducted in both Districts of Belang and Tombatu Timur, Regency of Minahasa Tenggara on January-February 2022. Two villages of the respective District were selected purposively as the sampling village. Additionally, the research used primary data, obtained from 60 farmers and selected by purposive sampling method. The data, then, was analyzed using the production function of the Stochastic frontier. In sum up, the results of analysis demonstrate that the fattening industry of beef cattle was feasible to perform, but the output of technical efficiency of beef cattle industry was still low, by its average of efficiency index value of 0.670. Meanwhile, the determining factors of beef cattle production were labor, green feed, and weight of feeder cattle. The access, therefore, to information sources, such as technical training and access to the improvement of total beef by capital increasing, is necessary to be developed.