The transition from high school to university is a time when young adults are vulnerable to a range of potentially negative outcomes; however, having a mentor as a form of positive social support can increase resilience and is associated with long-term positive outcomes. The current study examined a wide range of self-reported outcomes for 148 Canadian university students during their transition to adulthood, comparing those with a natural mentor to those without. Significant differences between those with a mentor and those without were found related to academics (academic/career goals, school importance), life satisfaction, and readiness for adulthood. Mentorship was also found to significantly predict readiness for adulthood in a regression model, after accounting for support from family and friends. Based on the current findings, high schools and universities should consider encouraging natural mentorship to aid in the transition after high school.