Purpose To examine changes in self-determination associated with youth participation in residential immersive life skills (RILS) programs. Method In this prospective mixed methods study, the Arc’s Self-Determination Scale was administered pre- and post-program, and at 3- and 12-month follow-ups, to 27 RILS youth and a comparison group of 11 youth enrolled in a non-residential life skills program. Ten RILS youth were interviewed 3 and 12 months post-program, with content analysis used to explore changes in autonomy, self-realization, and psychological empowerment. Results RILS youth showed statistically significant increases in autonomy immediately after the program, which were maintained one year later, whereas the comparison group displayed increased autonomy only at 3 months post-program. Qualitatively, RILS youth emphasized changes in behavioral autonomy and psychological empowerment 3 months post-program, whereas at one year there was greater emphasis on changes in self-realization. Using a triangulation protocol, the mixed methods data were interpreted as showing agreement regarding changes in autonomy due to intervention, partial agreement regarding self-realization, and dissonance regarding psychological empowerment. Conclusions RILS programs can enhance the autonomy of youth with physical disabilities and contribute to their sense of confidence and understanding of themselves as they move forward in life.