Affordances are action possibilities provided by the environment. This study investigated university EFL learners' perceptions of the critical thinking learning affordances in their course learning environment. The participants were a cohort of 156 fourth-year English majors from a Chinese university where the English department was under a curriculum reform to promote students' language learning and critical thinking development. The instrument of this study was the Learning Environment Affordance Survey_Critical Thinking (LEAS_CT) with a set of multiple-choice questions. The data analysis methods used in the study included descriptive statistical analysis, factor analysis, and MANOVA tests. The results showed that the English majors had strongly positive perceptions of the critical thinking learning affordances, which included four types: Rich Resources, Interactive Negotiation, Quality Task, and Community Culture. The results also revealed that high-achieving students had significantly better perceptions of the critical thinking learning affordances than lower-achieving students. Responses to the multiple-choice questions indicated that the English majors considered content-rich materials, teacher-facilitation, and small-group/peer learning benefited them most in terms of critical thinking development. Factors that influenced their perceptions of learning affordances and implications concerning integrating critical thinking into the tertiary EFL curriculum were discussed.