The aim of the assignment was a detailed analysis of the registry of tree natural values of Slovenia with 2529 trees. In the analysis we showed the percentage of each tree species, their genera, family and origin. There are 87.4 % native species, most of non-native species are from North America. By far the most common tree species is Tilia platyphillos. We defined types of tree natural values, criteria for evaluation and their locations. 77.9 % trees are local, the most important criteria is dimension of the tree, and most trees are found near Maribor with a density of 0.248 tree natural values/km2. We recorded average and maximum dimensions for each tree species and compared native with foreign species from the registry. We found out that most tree natural values are found near farms (31.2%) and in the proximity to a sacral object (17.9%). In the registry, 36.3 % of the trees are healthy, 4.1 % have no data and the other 59.6 % are injured. The results are intended to provide a general overview of information and the condition of tree natural values in Slovenia.