We explored the motivations for and psychological benefits gained from participating in the Florida Master Naturalist Program (FMNP). We surveyed 3,904 participants, and 1,983 participants responded with completed questionnaires, for a 50.79% response rate. Florida master naturalists participated to learn, help the environment, and act on altruistic values. The respondents indicated that their participation in the FMNP provides psychological benefits related to helping the environment, exploring, and being social. To foster support for master naturalist programs, program designers should attend to motivations and perceived benefits related to participation in such programming.