In exploring the quality of schools' social system, this study provides insight into in which types of schools students may encounter barriers in developing supportive teacher-student relationships because of teachers exposing low levels of trust in students. Student culture and teachability perceptions are assessed as incentives for teachers' perceptions of students' trustworthiness. Information was gathered from 2,104 teachers across a representative sample of 84 secondary schools in Flanders (Belgium). A measure for trust in students was derived from the trust scales developed by Hoy and Tschannen-Moran. Multilevel analyses reveal that teacher perceptions of students' teachability strongly predict teacher trust. This underscores the importance of teacher perceptions of students' ability to meet the expectations imposed on them with regard to the formation of trust. Additionally, we show that teacher trust is affected by the organizational school context, although the academic orientation of the student culture plays no role.