Question

Why is lumbering a winter activity? ​

Answer 1

frozen ground is easier to move logs over than muddy soil. In older times, logging in the winter also allowed you to stack the cut logs on river ice, so that when the ice broke up in the spring the logs would be 'driven' downstream to the mill. Also, with the cold most of the under brush would be dead and trailblazing would be easier.

Answer 2

because lumbering is a process done to save paper books etc