Survival and growth of trees in the high-mountain regions is strictly limited by environmental conditions and therefore very sensitive to climate change. The main working topic for research in the presented work is the fact that a significant change in temperatures and precipitation activities in recent decades is radically reflectes in the dead and heald of spruce stands in the area of their natural occurrence 7 forest vegetation stage specifically in the Poľana National Nature Reserve. The magnitude and nature of incremental changes in tree timber also depend on the extremes of global climate change and in terms of vegetation significantly on temperature and precipitation conditions. At the same time, the highlighted climate-growth relationships are changing – the strengthening of precipitation signal at lower elevations accompanied by weakening of temperature signal at high mountain signal was indicated. Also the shift of mixed signal mid-zone to higher elevations is highly probable due to further climate warning, thus enlargement precipitation-driven areas can be expected. Dendrochronological analysis of the growth of healthy and dying trees showed that the trees infested with bark beetle were not in optimal physiological condition, when they changed the growth trends since 1974 after the unknown (probably) climatic event. This confirms in the natural forest bark beetle acts as a selector and primarily infects trees with weakened resistance.