The goal of this paper is to familiarize the wider population with the concept of forest kindergartens, the benefits of nature and the importance of physical activity for preschool children, and to raise awareness of the benefits of outdoor activities for children in development. The increasing inactivity of children results in many health problems, including slowed motor development. Being in nature has a positive influence on children, which is mostly recognized in the scandinavian countries, and such a belief is spreading all over the world. Proof of this is the number of forest kindergartens, which is increasing every year. The importance of freedom in play and choosing activities in nature that children have in forest kindergartens is still insufficiently known for our climate. In addition to the research and study of the concept of forest kindergartens, this work contains a proposal of the plan and program of work of an imaginary forest kindergarten in Croatia by the author, based on theoretical foundations, previous knowledge and the way of working with children of early and preschool age.