The territory of the marten can cover up to 20 km² (12,5 sq mi) for males (although it is usually four times smaller). Females require a smaller territory, from 1.5 to 6.5 km² (0,9 to 4,3 sq mi).

The territory is marked by the scent produced by special glands on the abdomen and the anus. In winter, the territory of the marten decreases.