The practice of inclusion as a response to the Individuals with Disabilities Education Act means that English teachers teach students who demonstrate a wide range of abilities in the same classroom. This qualitative study explored the developing attitudes toward differentiation of English education teacher candidates participating in a methods course cotaught by an English education professor and a special education professor. Findings revealed that their pedagogical beliefs were influenced by having knowledge of individual students, proactively engaging with professional concepts, and attending to students' affective needs in academic contexts. The teacher candidates in this study were able to discuss differentiation, but they struggled to implement it in practice; therefore, we argue that instruction on differentiation must be explicitly integrated into English methods courses. Using cognitive flexibility theory, we suggest ways teacher educators can help future teachers develop advanced knowledge of differentiation to meet the needs of their future students.