The wind is able to cause major damage to the forest in a very short time. The damage caused by the wind manifests itself in different ways. We distinguish windbreaks, windthrows, and bendings. This paper presents the research results on the productivity of the Komatsu 951G harvester in poplar stands (Populus x euramericana clone M-1), affected by windbreaks and windthrows. The share of the effective working time was represented by 79% of total time, while delays share was 21% of the total time of cutting and processing of assortments. The productivity of the harvester was expressed in m³ per working hour of the machine, it was 24.48 m³/h. The research showed that the price of a harvester per one working hour is € 82.88, but the unit cost of the Komatsu 951G harvester is € 3.39/m³.