This article examines learning processes and learning opportunities in the outdoor school based on 13 focus-group interviews with children (ages 8-9) at three German elementary schools. For 1 year, cross-curricular teaching had taken place once a week outside the classroom--in natural settings, at cultural sites or on school grounds. The article discusses the learning potential of the outdoor school in terms of activities that the children perceive as dominant, i.e. "playing," "moving" and "social cooperation." It will discuss and reflect upon the learning opportunities that arise as well as on the limitations of learning in out-of-school settings and the role of learning in the children's perception. The study reveals that the outdoor school as a place of teaching, play, exploration and experience offers formal and informal learning opportunities and encourages children to engage among themselves and within their social and inanimate surroundings by challenging them physically, cognitively, perceptually and socially. Learning processes initiated through play, activity and social cooperation are often not perceived by the children as 'learning' in the formal sense. Apparently, a significant proportion of the outdoor school's potential lies in the combination of teacher-structured and informal learning processes that arise spontaneously.