This masters thesis examines the change of leaf colors in fall from different perspectives. The phenological observations, in seven selected tree species, between 2014 and 2015 are an attempt to study this annually recurring event. A literature review shows that a number of endogenic and exogenic factors influence the change of leaf colors. The focus was therefore laid on the climate factor of temperature. The selected tree species confirm the decline in temperatures, with the threshold of 4-7C triggering the change of leaf in the years 2014 and 2015. Most of the deciduous woods under review responded to the drop of temperature by leave color changes, which was observed one to two weeks afterwards. Other photosynthetic pigments appear due to the chlorophyll degradation in fall, which leads to a range of leaf color shades. The leaf colors, which are mostly yellow, orange or red during this season, are created by carotenoids. Observations over these two years have shown that in fall the wide range of colors of leaves includes above all warm colors. Yellow leaves have a brightening effect creating a sunny atmosphere. Orange color symbolizes liveliness, and red indicates energy and warmth. These are the main colors in fall as a result of the change of leaf colors, providing an impressive transition from summer to winter from the point of view of design. This enormous color spectrum, which is caused solely by the chlorophyll degradation in the leaves, begins at the end of September and continues until end of November, depending on the type of tree. During these two months an attractive green space can occur through the combination of different foliages, hours and admission, and different peak fall foliage periods.