Chino Hills State Park, State nature reserve in Los Angeles Basin, California.

Chino Hills State Park is a nature reserve covering over 14,000 acres across rolling hills and canyons near urban areas. The landscape includes coastal sage scrub, oak woodlands, and grasslands that form a variety of habitats.

California began acquiring land in the Chino Hills in 1977, leading to the park's official establishment in 1984. The protection of this area was part of a broader effort to preserve natural spaces in the expanding region.

The park's name comes from the Chino Hills, the foothills of the Santa Ana Mountains where it lies. The Tongva-Gabrieliño set up temporary camps here to gather acorns, elderberries, walnuts and other seeds, and the Rolling M Ranch, established in 1848, later leased the land for cattle grazing. A ranch house, barn, windmills and watering troughs remain as reminders of that ranching era.

The park has four main entrances: the north entrance off Sapphire Road in Chino Hills, the Rim Crest Drive entrance in Yorba Linda, an entrance reached via the Green River golf course in Corona, and the Discovery Center entrance off Carbon Canyon Road in Brea. Most trails are open to hikers, equestrians and mountain bikers, but a few are hiking-only for safety or habitat protection. The terrain is hilly and the paths are dirt, so wear sturdy shoes and carry water.

The park stretches from the Santa Ana Mountains to the Whittier Hills, creating an important wildlife corridor in a densely populated region. This connection allows animals to move between different habitats and keeps ecosystems linked together.