Objective: To explore changes in family‐based nature activities (FBNA)across five developmental stages and investigate whether frequency and typeof FBNA across the early life course is associated with greater familyrelationship quality in emerging adulthood. Method: Retrospective survey datawas collected from 451 undergraduate students who primarily identified asAsian American (44.9%) and Latinx (42.7%). Results: Multilevel models showedthat participants who showed greater stability in FBNA across the early lifecourse reported more positive family relationship quality in emergingadulthood. Higher income participants’ FBNA declined more rapidly as theyaged, whereas lower income participants showed greater stability across fivedevelopmental stages. Greater participation in social, physical, nature, andtravel types of outdoor family activities were associated with more positivefamily relationship quality in emerging adulthood, whereas sports andentertainment were not significantly associated. Conclusion: Findings supportthe FBNA framework, suggesting that continued participation in outdoor familyrituals across the early life course is associated with positive familyrelationship outcomes in adulthood. Implications: Results are discussed inrelation to the importance of studying outdoor family leisure rituals in thefield of human development and family studies.