Traveler.jpg â The stateâs biggest Bristlecone pine tree can be found in the Mount Charleston Wilderness Area, outside of Las Vegas. Photo courtesy of Famartin The Nevada Division of Forestryâs State Big Tree Program has been identifying the largest specimen of every native and introduced tree species growing in Nevada since 1992.The divisionâs first register listed some 70 trees, which, with submissions from the public throughout the years, has grown to 303 tree species. Keep in mind that most of the stateâs biggest trees are found on private property, so seeing them can be difficult. The Division of Forestry notes that trees selected for the Big Tree list are compared on a point basis that includes not only height but circumference and crown spread. The measuring guidelines are set by American Forests, which maintains a national registry of big trees.