Background: Individuals with developmental disabilities have specific physical and psychosocial needs that can require extra support to participate fully in and enjoy many benefits of recreation activities. Unfortunately, little is known about individuals with developmental disabilities' experiences in outdoor recreation. The purpose of this study was to explore adults with developmental disabilities' perceived benefits of outdoor recreation, and the constraints or facilitators that affected their participation. Method: Qualitative, semi-structured interviews were conducted with seven adults with developmental disabilities. Interviews were analysed using open, axial, and selective coding techniques. Results: Results revealed three themes: (a) benefits of; (b) constraints to; and (c) facilitators of outdoor recreation. Benefits of outdoor recreation reported by study participants included their experiencing satisfaction, mental reprieve, empowerment, enlightenment, social connectedness, and thrill. Participants also shared intrapersonal, interpersonal, and structural constraints and facilitators related to their outdoor recreation participation. Conclusions: Practical implications and future research recommendations are discussed.