Matanuska Glacier is a valley glacier in the US state of Alaska. At 27 miles long by 4 miles wide, it is the largest glacier accessible by car in the United States. The drive to is approximately 2 hours each direction with 4 hours total along the scenic Glenn Hwy. During the winter season the start time of the tour may vary in order to accommodate the safest driving conditions for our drivers and guests. Your guide will communicate with you prior to the day of departure for the tour.