Forest learning has been encouraged globally in recent years as it regularly provides opportunities to interact with nature and one's own abilities. The contributions of forest and traditional kindergarten and home environment to children's ecological cognition and how ecological cognition relates to executive function (EF) is understudied. Therefore, this study evaluates the ecological cognition and EF of children from traditional and forest kindergartens along with home environment involvement in sustainability behavior. A total of 78 children, their teachers, and parents were recruited for this study. The children's ecological cognition and EF levels were tested using a series of tasks and short interviews. Home persuasion related to sustainability behavior was assessed by questionnaire. The analysis revealed that forest kindergarten is the main factor that is involved in children's ecological cognition and EF. The discussion outlines the trajectories and factors that delineated children's cognitive growth when sustainability was part of their education