Finnish nature schools are environmental education organisations offering outdoor programmes for classes in natural environments. They are intended to contribute to the aims of the national curriculum in various subjects. This qualitative study examines how students describe their learning in a nature school context and how they describe differences between learning in nature and learning in the classroom. After a nature school day, 30 10-11-year-old pupils participated in focus groups interviews. The data were analysed through inductive content analysis. Nature school learning was described as cognitive, affective, social and as providing practical skills learning, although some pupils claimed that they had not learned anything. The differences between the learning environments were described as differences in learning activities, concreteness, external conditions, learning topics, perceived ability to concentrate and differences in motivation. We stress the importance of reflection on learning in order to raise pupils' awareness of their outdoor learning.