Kindergartens that nurture an ecological approach when raising a child and focus attention on care for the environment and sustainable development are called eco-kindergartens. The goal of every eco-kindergarten is to create in children a habit of caring for the environment, and through an ecological approach to raising children, to influence their cognitive development. There are about a hundred eco-kindergartens in Croatia that are recognized by the International Eco-Kindergarten, whose goal is to incorporate environmental education into all segments of the process and daily life of children, parents, kindergarten workers and the wider community. The first part of the paper provides an overview of the description of activities in eco-kindergartens in terms of the approach to this kind of upbringing in early education, but also awareness and the importance of ecology in the life of each child and its environment. In addition, the first part of the paper, which is based on a review of the relevant scientific literature on the mentioned topic, cites some examples from European countries where the ecological approach in kindergartens is strongly represented. The second part of the paper is a description of the activities of a kindergarten in the Republic of Croatia. The research will show a part of eco-kindergartens and their activities, that is, what kind of eco-program kindergartens in Croatia present. The work will provide answers to the questions of what an eco-kindergarten is, what the difference between Croatian and European kindergartens is, and finally, what eco-kindergartens in Croatia do to implement the goal of the International Eco-kindergarten.