Conejo Mountain is a in

Ventura County, California Ventura County () is a county in the southern part of the U.S. state of California. As of the 2020 census, the population was 843,843. The largest city is Oxnard, and the county seat is the city of Ventura. Ventura County comprises the Oxn ...

near

Camarillo Camarillo ( ) is a city in Ventura County in the U.S. state of California. As of the 2020 United States Census, the population was 70,741, an increase of 5,540 from the 65,201 counted in the 2010 Census. Camarillo is named for brothers Juan an ...

on the eastern boundary of the

Oxnard Plain The Oxnard Plain is a large coastal plain in southwest Ventura County, California, United States surrounded by the mountains of the Transverse ranges. The cities of Oxnard, Camarillo, Port Hueneme and much of Ventura as well as the unincorpora ...

. At the western edge of the

Conejo Valley The Conejo Valley is a region spanning both southeastern Ventura County and northwestern Los Angeles County in Southern California, United States. It is located in the northwestern part of the Greater Los Angeles Area. Communities in the Conejo ...

, it is adjacent to the

Santa Monica Mountains The Santa Monica Mountains is a coastal mountain range in Southern California, next to the Pacific Ocean. It is part of the Transverse Ranges. Because of its proximity to densely populated regions, it is one of the most visited natural areas in ...

. Crossing what was once a formidable barrier for travelers,

U.S. Route 101 U.S. Route 101, or U.S. Highway 101 (US 101), is a north–south United States Numbered Highway that runs through the states of California, Oregon, and Washington, on the West Coast of the United States. It is also known as (The Royal Roa ...

passes through the area on the steep

Conejo Grade The Conejo Grade is a 7% grade incline on a section of US 101 (the Ventura Freeway). Also known as the Camarillo Grade, it links Thousand Oaks and cities of the Conejo Valley, with Camarillo and the cities on the Oxnard Plain. With a summit elev ...

. The mountain was once a large

volcano A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are ...

about 14 million years ago, but it has been extinct for millions of years. The mountain was under sea-level at one point. Mining operations have been ongoing here since 1959 and most of the mountain is owned by the Pacific Rock mining operation. The

Santa Monica Mountains Conservancy The Santa Monica Mountains Conservancy is an agency of the state of California in the United States founded in 1980 and dedicated to the acquisition of land for preservation as open space, for wildlife and California native plants habitat Natu ...

, Pleasant Valley Recreation and Park District and Conejo Open Space Conservation Agency have interest in administrating the area as protected open space. Trails reach into the area from Pepper Tree Playfield and

Dos Vientos Community Park Dos Vientos Community Park in southwestern Newbury Park, CA is the largest of Conejo Recreation & Park District’s public parks in the Conejo Valley. It is adjacent to the Dos Vientos Community Center, which offers a preschool, sports, and other ...

via

Dos Vientos Open Space Dos Vientos Open Space is a open space area in western Newbury Park, California. It contains more than of trails used for cycling, hiking and equestrians. Originally a part of the Rancho Guadalasca Spanish Land Grant of 1836, the area is now a ...

in southwestern Newbury Park.

Sources

{{reflist Camarillo, California Mountains of Ventura County, California Mountains of Southern California