The South Carolina Master Naturalist Program provides nature-based education to citizen volunteers who will promote environmental stewardship and is offered at six host sites across the state. We conducted a mixed-methods evaluation (the integration of qualitative and quantitative data) of the South Carolina Master Naturalist Program. Overall, the South Carolina Master Naturalist Program is achieving its mission but there were some differences between host sites. We identified where there were differences and why those differences may exist. We make recommendations to help strengthen the program across all host sites in the areas of program fidelity, delivery, and administration.