Original Irvine Ranch National Natural Landmark Adventures

Designated in 2006, the Original Irvine Ranch National Natural Landmark protects approximately 88,000 acres of land located primarily within the Irvine Ranch area of Orange County, California. This site is recognized for its exemplary natural communities of coastal sage scrub and chaparral, which support a diverse array of plant and wildlife species, some of which are rare and threatened. The ridge lines, hills, and valleys of the landmark provide scenic views and serve as important biological corridors amid a heavily urbanized region. Historically, the Irvine Ranch was a large cattle ranch operation dating back to the late 19th century, and its preservation today safeguards remnants of Southern California’s original landscapes prior to widespread development. Outdoor enthusiasts can explore various trails for hiking, mountain biking, and wildlife viewing, with notable sites including Limestone Canyon, Quail Hill, and Bommer Canyon. The area holds cultural and ecological significance, featuring native oaks, coastal sagebrush, and wildlife such as California gnatcatchers and mule deer. Access points are convenient from Irvine and neighboring cities, making it a valued natural retreat within Orange County's urban setting. The preserve's stewardship involves local agencies and nonprofit organizations working to maintain habitat quality and provide visitor education. The diverse topography and seasonal wildflowers make this Landmark a rewarding destination for nature lovers year-round.