Have you ever seen snow ghosts and wondered how they were made? Probably not. I bet you think they are made of snow, but they aren't! They are made of hoar frost and rime. Hoar frost is better known as freezing fog. Rime is the formation of ice crystals. The moisture in the fog freezes to whatever it hits, in this case trees. Ice crystals form and, voila! You have a snow ghost. Snow ghosts are fairly rare, but we see them all the time high in the mountains. They are beautiful white sights. Here are some pictures of snow ghosts taken on Big Mountain the day we went to Avalanche Safety Class. Read about it here, Hoar, Ghosts, and Pits!