Jeffrey City, Wyoming, is hosting its 5th annual Nephrite Jade Festival, Friday, August 14 through the 16th. The Wyoming Jade Festival in Jeffrey City, Wyoming, is an annual 4-day gathering celebrating the state's legendary status as home to some of the purest jade in the world. The Curious Vida Jeffery City YouTube The Curious Vida Jeffery City YouTubeImagine a Wyoming town that is so lost and forgotten the internet doesn't know its population or if anyone lives there at all. Jeffrey City, Wyoming, was transformed from a small homestead in the 1950s, when uranium was harvested near there. He does spend his winters in Arizona, but if you find yourself in Jeffrey City, Wyoming.