Ancient Bristlecone Pine Forest, Protected pine forest in White Mountains, California.

The Ancient Bristlecone Pine Forest lies on the eastern face of the White Mountains above the northern Mojave, in Inyo National Forest. Great Basin bristlecone pines (Pinus longaeva) grow between 9,800 and 11,000 feet, alongside limber pine. The Patriarch Grove holds the Patriarch Tree, the largest bristlecone, and is the source of Cottonwood Creek.

The forest's oldest known tree, Methuselah, is 4,858 years old and is considered the world's oldest confirmed living non-clonal organism. A 5,062-year-old bristlecone discovered in 2010 was removed from the database in May 2017 by Dr. Peter Brown when the tree and its core sample could not be found. On September 4, 2008, an arsonist set fire to the Schulman Grove Visitor Center and several pines; the building and exhibits were destroyed, and rebuilding began the next day.

The place holds deep meaning for scientists who study how climate affects trees across thousands of years. Visitors often encounter research teams conducting fieldwork during their time here.

Access to the forest comes via a mountain road that may be closed depending on the season, so checking conditions before visiting is wise. Wear warm clothing and bring plenty of water, since the elevation and rough terrain can be demanding.

Some trees here are older than the oldest known writing systems of humanity, making them a living window into ancient times. This extreme longevity comes from a genetic trait that helps them survive in the harsh environment.