EN
The aim of the study was to state differentiation of unit cost chosen forest works (artificial regeneration, reforestation, overplanting, replanting, wood harvesting, wood extraction, forest protection against wildlife) in different forest districts as well as define factors influencing on unit costs variableness. Another purpose was to state dynamic of the change investigated unit cost in period 2006-2009 and indicate the reasons influencing on their instability. Important factors conditioning unit costs of analyzed forest works are: altitude above sea level, orographical conditions influencing on the work difficulty and the site type of the forest. Regional Directorate of States Forests in Krosno is very good object to examined variableness and conditioning factors of unit costs, because it consists of low, highland and mountain units.