Beaver Moon Full Moon Ritual The last full moon before the Winter Solstice is called the Beaver Moon, Snow Moon, Frost Moon, Moon of Feasting, and the Mourning Moon. This is a time to prepare for the dark nights of Winter, to rid ourselves of habits and relationships that do not serve us and to mourn those we have lost. On this show, our ritual will focus on washing away those habits that do not serve us.  We will also take some time to mourn those we have lost this year.