In all harvesting operations, minimized risks for soil damage combined with short forwarding mileage are desirable in order to achive cost efficient work. This study examined how forwarding mileage are influenced by the time of the year a harvesting operation is conducted. Two scenarios that corresponded to the terrain water conditions during wet and drier periods of the year were created. Twenty harvesting sites were simulated with these scenarios. The results showed that the forwarder’s mileage was reduced in the dry conditions, and that even the forwarder’s mileage over wet areas was reduced under these conditions. This means that there is a potential for productivity increase as well as to reduce the risk of soil damage in wet areas.