When glaciation from the most recent ice age retreated from the area that is now Cranberry Glades a number of plants that are adapted to cool climates remained. Since the area is at about 3500 feet above sea level, these tundra type plants could thrive in the bogs. The cool temperatures of Cranberry Glades made the conditions for the subalpine flora. The dominant sphagnum moss (Sphagnum sp.), reindeer lichen (Cladonia sp.) and small cranberry (Vaccinum oxycoccos) are example vestiges of the post glacial period over 10,000 years ago.