Introduction: Student-run Campus Food Systems Alternatives (CFSA) have been proposed as spaces which have the potential to advance Critical Food Systems Education (CFSE) – the objective of which is to motivate students to act toward radical food systems transformation on community and systemic levels. Evidence on how learning dynamics in CFSA drive student participants to develop critical perspectives on food systems is limited, however. This paper seeks to address this gap by exploring how critical and transformative learning happens in these informal and student-run spaces, by detailing a multi-case study of students’ learning experiences in four student-run CFSA on the McGill University campus. Methods: Data on students’ learning experiences was collected through observational field notes of CFSA activities and semi-structured Interviews with student facilitators. Thematic and cross-case analysis was performed with interview data. Results: Analysis of students’ described learning experiences in CFSA revealed three broad categories of learning dynamics which drive students’ learning about food systems and their willingness to act for food systems change: hands-on work in informal spaces, social connection and engagement between student participants, and engagement with the beyond-campus community. Discussion: Engagement with the beyond-campus community via CFSA, particularly that which involved exposure to food-related injustice in marginalized communities, was found to be particularly important in driving student participants’ critical reflection on food systems and willingness to act toward food justice. A lack of intentional critical reflective practice was however observed in CFSA, calling into question how this practice can be driven in campus food initiatives without compromising their student-run and informal structures.