In 1997, we surveyed members of the Appalachian Trail Conference to identify characteristics and assess motivations of the active and nonactive members in this organization. We investigated the effects of social networks, competing commitments, lifestyle changes, personal growth, and belief of the efficacy of one’s actions on decisions to become and remain active members. We found the determining factors in decisions regarding volunteer activity were competing commitments and efficacy. Active members indicated that the efficacy of their actions was most important in their decision to participate, whereas nonactive members cited the importance of competing commitments in their decision not to participate. Recruitment and retention of volunteers may be aided by increasing the awareness of volunteer programs, ensuring that programs provide results of which individuals are proud, requesting the participation of individuals on both local and national levels, and recognizing volunteers for their contributions.