Contra Costa Rock Park

Contra Costa Rock Park is a small public park located in the Northbrae area of Berkeley, California. This compact 0.17-acre (7,410 sq. ft.) green space is one of Berkeley's several rock parks, offering visitors a unique geological experience within an urban setting.

The park features prominent rhyolite outcrops, which are remnants of ancient lava flows that occurred millions of years ago. These volcanic rocks have been exposed over time as softer surrounding materials eroded away, leaving behind the harder rhyolite formations that characterize the park today.

Contra Costa Rock Park provides opportunities for beginner-level rock climbing, making it a popular spot for those looking to practice their skills or introduce children to the activity in a controlled environment. The park also holds historical significance, as it contains evidence of early Native American Indian life in the form of grinding holes or mortar rocks used by indigenous peoples.

Originally part of a larger area owned by the Berkeley Development Company, Contra Costa Rock Park was set aside as a public space during the subdivision of the Northbrae neighborhood in the early 20th century. It was officially dedicated as a park in 1917, preserving this unique geological feature for public enjoyment.

The park is open daily from 6:00 am to 10:00 pm, allowing visitors to explore its natural features and enjoy the scenery throughout the day.