Experiential learning pedagogies are being adopted across undergraduate education and touted as an effective strategy for enhancing student learning. This paper develops an explanation for how and why such pedagogies can foster students' critical thinking and learning. Drawing on data collected from first-year students in "field based" urban geography courses at an urban university, I show how students' existing knowledge of urban spaces and specific parts of the city is constructed from a variety of sources and experiences, and can be incorporated in experiential learning activities in ways that foster critical learning. Such an approach is crucial to creating learning environments in higher education that include a greater diversity of student identities and life experiences.