This study was designed to determine if participating in a full-year peer mentor experience affects their emotional intelligence (EI) scores. Students selected to the peer mentor program for the Department of Animal Science at Iowa State University (n = 34) completed TalentSmart’s Emotional Intelligence assessment before starting the program (January, 2014) and then completed the EI reassessment after completing the program (December, 2014). All data were analyzed using paired t-tests (PROC TTEST, SAS Version 9.3) to determine potential differences between each student’s beginning and ending EI scores (4 distinct categories and 3 composite categories with possible scores ranging from 50 to 100). Scores for self-awareness, self-management, social awareness, and relationship management all significantly increased for peer mentors. The associated composite categories of personal management and social management also were significantly increased, as was the composite for overall EI. Students that were new to the peer mentor program and started with initial overall EI scores that were below the group average score experienced the largest increase in all scores, with over a 14-point increase in self-awareness scores and over a 12-point increase in social awareness scores. Students showed improvements in all aspects of their EI as a result of completing the peer mentor program in the animal science program at ISU.