This study sets out to see if the slope can affect mechanized cut-to-length harvester operations’ productivity and harvesting cost. To test this assumption, two different harvesters were applied to the study: an excavator-based machine (EBM) (Volvo EC210BF) and a purpose-built machine (PBM) (TimberPro TL725B). Both harvesters were equipped with a Maskiner SP 591 LX harvester head.