Black Hill, Volcanic summit in Morro Bay State Park, California, US.

Black Hill is a 203-metre volcanic plug, or neck, in Morro Bay State Park, part of the Nine Sisters chain between Morro Bay and San Luis Obispo. A path on its western slope leads to the summit, and the access road stays open during daylight hours. A Monterey pine grove called Fleming's Forest covers part of the hill.

Black Hill is a volcanic neck about 20 million years old, formed when the region was still volcanically active. It is one of the Nine Sisters, a chain of such necks running between Morro Bay and San Luis Obispo. Its name is thought to come from a tar seep filtering up through the ground on the hill's northern side.

The summit path passes through native plant communities including sticky monkeyflower scattered among California oak and eucalyptus trees. Visitors experience the variety of coastal California vegetation on a short walk.

The trail is short and straightforward, starting near the golf course with no entrance fee required. Good hiking boots help on the rocky terrain, and bring water since the exposed slope offers little shade.

From the rocky outcrops visitors can see the tidal channels of Morro Bay estuary and the Irish Hills creating a distinct southern horizon. This view reveals how volcanic activity shaped the surrounding landscape.