Graphing ability facilitates students to understand and to connect graphs of data with real-world situations. This ability related to mathematical competencies such as logical thinking and visual representation. One aspect of graphing ability that is important for student to get meaning from graph is interpreting graph. The purpose of this study is to investigate the performance of prospective teachers in interpreting graphs on context-based tasks. This study uses descriptive-explorative method involving 24 prospective teacher participants at state university of Surabaya.  The results showed that 68% of students could interpret the graph correctly with good interpretive reasoning and 32% were incomplete in answering and had problems in understanding the graph. The performance of prospective teachers in interpreting the graph is explained and the difficulties that arise in interpreting are also discussed.