A young mastodon wakes to a wintry day, "It's a SNOW DAY!" she shouts and leaps outside. Meeting her best friend, Jefferson the sloth, they challenge themselves to hike to the top of a tall mountain. The friends soon discover they have to overcome obstacles to reach the summit. With help from friends Beaver, Salamander and Bison, the team reaches the peak and realizes there more to the journey than they had thought. These adventurous friends then craft skis and snowboards from branches and zip down to be greeted by Miss Mammoth who lovingly carries them home. An empowering and beautifully illustrated story with an index of interesting Ice Age facts. Inspired by historic Ice Age discoveries in Snowmass Village near Aspen, Colorado, in 2010.