The goal of this research was to create an educational, outdoor Augmented Reality tour for preschool children using Minnesmark editor and mobile application. It started with an ethnographic pre-study which aimed understand the children’s abilities, characteristics and interests. It was followed by a bodystorming session which allowed the children to contribute to the design process together with the designer. Based on all the findings, a context scenario was created which showed the concept of a practicable tour. All the functional and data requirements were specified before creating the tour. The design was intended to be user-centred and to have positive effect on the children’s learning of sustainability and biodiversity. The tour was refined and created as a final product. 10 children participated in the tour which was executed in a forest behind the preschool and the preschool garden. The tour was evaluated which identified the design problems and their possible solutions.