Planners and landscape architects have long recognized the critical role of green space in urban environments. This cross-sectional field study of 68 adolescents determined the association between percent neighborhood park area and perceived stress among adolescents, while controlling for physical activity. This study is the first to examine this association using objective measures of park area and adolescents physical activity. A multivariate regression model indicated that percentage of park area (β = -62.573, p < 0.03) predicts perceived stress among adolescents. Access to neighborhood parks buffers adolescents against perceived stress after controlling for socio-economic status and physical activity. Policy recommendations for incorporating parks into neighborhood design are given.