Objective: To explore changes in family‐based nature activities (FBNA)across five developmental stages and investigate whether frequency and type of FBNA across the early life course is associated with greater family relationship quality in emerging adulthood. Method: Retrospective survey data was collected from 451 undergraduate students who primarily identified as Asian American (44.9%) and Latinx (42.7%). Results: Multilevel models showed that participants who showed greater stability in FBNA across the early life course reported more positive family relationship quality in emerging adulthood. Higher income participants’ FBNA declined more rapidly as they aged, whereas lower income participants showed greater stability across five developmental stages. Greater participation in social, physical, nature, and travel types of outdoor family activities were associated with more positive family relationship quality in emerging adulthood, whereas sports and entertainment were not significantly associated. Conclusion: Findings support the FBNA framework, suggesting that continued participation in outdoor family rituals across the early life course is associated with positive family relationship outcomes in adulthood. Implications: Results are discussed in relation to the importance of studying outdoor family leisure rituals in the field of human development and family studies.