Effective teamwork and collaboration among health professionals is a well-recognized strategy toward enhancing patient outcomes. However, there is a lack of understanding on how to best prepare health professionals for collaborative practice. The aim of this research is to gain a better understanding of how graduates of five health professions (dentistry, medicine, nursing, pharmacy, physiotherapy) perceive and experience interprofessional education for collaborative practice (IPECP) throughout their health professions journey, with a focus on transition to practice. This longitudinal study employed an interpretive, narrative methodology to understand interprofessional identity development of 24 individuals who had recently graduated from a health professions program (dentistry, medicine, nursing, pharmacy, physiotherapy) at a Canadian university. Participant experiences were analyzed using narrative analysis. Participants' narratives provided insight into the context, factors and curricular experiences needed for interprofessional identity development and preparedness for collaborative practice. Participants identified the importance of socialization and connection with others, collaborative role models and exposure to collaborative experiences and settings for interprofessional practice. Participants expressed some dissatisfaction with their earliest IPECP experiences and most valued their exposure to 'real-life' practice examples and clinical scenarios. Participants desired more authentic experiences of interprofessional collaboration during their programs. Improving health professionals' interprofessional socialization and collaborative experiences within IPECP is critical to improving patient outcomes. Study findings can inform future curricula and IPECP strategies that create conditions to enhance collaborative practice and ensure the preparedness of a future health workforce with a strong collaborative identity.