Every fall in one of the largest national parks in America, visitation slows to a near halt by the end of September. The ground is already covered with golden aspen leaves and the mountaintops are powdered with snow called “termination dust”. The skies lose up to 9 minutes of sunlight every day and the northern lights dance over the crisp landscape at night. While so much of the park and landscape slows into the winter, there is one group of individuals that eagerly await the snow: the sled dogs of Denali.