Abstract This study examined the relationship between children’s time spent outdoors, nature connection, and environmental stewardship. It was hypothesized that time spent outdoors predicted a feeling of connection to nature, and that connection to nature, in turn, influenced environmental stewardship. A total of 218 fifth-grade students from central Pennsylvania participated in the study. Baron and Kenny’s (1986) method was used to establish mediation using ordinary least squares regression. It was found that nature connection partially mediated the direct effect of time spent outdoors on environmental stewardship and increased the amount of variance explained. In other words, a feeling of connection to nature explained a portion of the effect that time spent outdoors has on environmental stewardship behaviors. Future studies that examine predictors of nature connection, including direct experience with nature, environmental education programs, and underlying personality characteristics, are warranted.