[1] The highest point of the hills is Comanche Mountain, at 364 feet (111 m) in elevation.

The Tejon Hills run below the western face of the Tehachapi Mountains, along the edge of the San Joaquin Valley.

They are approximately 20 miles (32 km) west of the town of Tehachapi, south of Arvin, and east of Wheeler Ridge, Interstate 5, and U.S. Route 99.

They are formed of uplifted marine sediment deposits, unlike the adjacent Tehachapi Mountains of igneous materials related to the Sierra Nevada on the north.

The soil has a predominant alkaline ph, and supports several locally endemic plant species.