While research has been conducted concerning the effects of school-based mentoring on at risk students, limited work has focused on the volunteer mentors. This study examined the motivations of adult volunteers and the benefits of their participation in a six-month, school-based mentoring program. A total of 31 volunteers completed adapted versions of the Volunteer Functions Inventory and a post-survey as part of a program in which they mentored at-risk elementary school students. Volunteers were more satisfied with their mentoring experience when their perceived benefits matched their initial motivations, though this did not seem to impact their intentions to mentor again in the future. Volunteers' motivations tended toward expressing important values or gaining greater understanding, though some younger volunteers were also motivated to gain career-related experience. Implications for school-based mentoring programs are addressed.