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OBJECTIVE: Among the many milestones of adolescence and young adulthood, transferring from pediatric to adult care is a significant transition for those with type 1 diabetes. The aim of this study was to understand the concerns, expectations, preferences, and experiences of pre-transition adolescents and parents and post-transition young adults. RESEARCH DESIGN AND METHODS: Participants completed questionnaires and responded to open-ended qualitative questions regarding self-management, self-efficacy, and their expectations and experiences with pediatric and adult care providers across the transition process. RESULTS: At a mean age of 16.1 years, most pre-transition adolescents had not yet discussed transferring care with their parents or doctors. Although many post-transition young adults reported positive, supportive interactions, several described challenges locating or establishing a relationship with an adult diabetes provider. Qualitative themes emerged related to anticipated timing of transfer, early preparation for transition