The results of the study of the radial growth of beech (Fagus sylvatica L.), which grows in the medieval plantation of the Skolivski Beskydy National Nature Park using dendroindicative methods, are presented. The reaction of radial growth to climate changes was studied for two periods: 1982–2000 and 2001–2020. A decrease of radial growth in the second period by 14% was established. The impact of precipitation on growth almost did not change in the second period compared to the first, as well as their amount, which mainly fluctuated in the range 1–5%. The negative influence of relative humidity increased in the second period, especially in July–August. Despite the increase in temperature and decrease in radial growth in 2001–2019 compared to 1982–2000 by 14%, it can be stated that at this stage the beech plantation was able to adapt to climate change, although at the same time it has become more vulnerable to climate variations.