During the winter months, cold temperatures and deep snow in the inland sanctuaries invite many outdoors activities from snowshoeing and cross-country skiing to ice fishing on the ponds. Lean-tos along the International Appalachian Trail (IAT/SIA) in the East Branch Sanctuary can be used for winter camping. Snowmobiling is permitted on designated trails.

Winter is also a perfect time for tracking such animals as Canada lynx, bobcat, moose, white-tailed deer, pine marten, snowshoe hare, and red squirrel.