This study investigates the relationship between avoidant attachment, growth mindset, and adaptation to college environments of college students to verify the mediating effect of growth mindset. For this study, a survey was conducted among 260 students enrolled in colleges in Seoul and nearby capital area were surveyed. The collected data were analyzed using the SPSS 25.0 program. As a result, there was no gender difference in avoidant attachment, growth mindset, and adaptation to college environments, but there were significant differences depending on their grades and majors. Second, significant correlations between avoidant attachment, growth mindset, and adaptation to college environments were observed. Avoidant attachment had a significant effect on growth mindset and adaptation to college environments. Lastly, growth mindset was found to partially mediate the relationship between avoidant attachment and adaptation to college environments. These results suggest that college students' avoidant attachment not only directly affects adaptation to college environments, but also indirectly affects it through growth mindset. This result of this study indicates that the growth mindset is a buffering factor for avoidant attachment. This study suggests the possibility of mediating both adult avoidance attachment and adaptation to college environments of college students in terms of growth mindset, which derives from willingness to change their abilities and personalities.