This article addresses the insufficiently researched topic of Green Project Management (GPM) in nonprofit organizations (NPOs). Factors supporting the application of GPM in NPOs can be identified among both external conditions (e.g., environmental policy, funder requirements) and internal conditions related to the specificity of the functioning of the NPO (e.g., size, forms of employment, sources of financing, project management solutions). This article aims to contribute to the discussion on the factors facilitating GPM in NPOs. The focus is specifically on the frequency of GPM practices in the areas of People, Planet, and Prosperity during project implementation. The study employed a quantitative survey using the CAWI technique; the respondents were individuals representing NPOs in Poland with project experience.