The article hypothesizes that informal youth organizations influence processes of transition to adulthood by facilitating role development, that is, the conversion of child‐oriented roles into adult‐oriented ones. In an attempt to test the hypothesis, two variables were specified. Informality was defined in terms of seven organizational components: moratorium, symmetry, dualism, multiplexity, expressive instrumentalism, voluntarism, and pragmatical symbolism. The impact of these components on role development was measured by three indicators: Role Scope, Role Types and Role Aspects. Residential summer camps served as a quasi‐experimental laboratory for the research. A positive significant relationship was found between the level of informality and level of role development, especially in the long run. Findings are explained by the particular experiences youth undergo in informal socialization contexts, in which trial and error behavior, balanced reciprocity, and normative ambivalencies are institutiona