The young are naked and blind, and weigh around 25 grams. They begin leaving the dens to forage six weeks after birth and are weaned two weeks later. New burrows begin to appear in July. The young reach sexual maturity at 2 years of age. They are most active between 8 and 9 am and 4 and 5 PM, but can be seen throughout the day.
Woodchucks are terrestrial and fossorial, creating burrows with elaborate passageways.
They can also climb trees fairly will, and can swim across rivers and streams to reach prime feeding areas. Woodchucks use to separate burrows, a summer burrow and a winter burrow, and each woodchuck has its own burrow. While they are not territorial animals, woodchucks will defend their homes from intruders. The entrance to a woodchuck burrow is characterized by a mound of fresh dirt surrounding it. Burrows usually have a back entrance as well, but that opening is usually located under brush, making it more difficult to locate.