Islay Hill

Islay Hill is a mountain summit in San Luis Obispo County, California, forming part of the Nine Sisters range. The hike climbs through open grassland dotted with oak trees to reach the peak.

The mountain formed about 20 million years ago through volcanic activity as part of the Nine Sisters chain. This geological feature has shaped the landscape of central California since its creation.

Local residents frequently organize guided nature walks to teach visitors about the native plant species and geological features of Islay Hill.

The trailhead at Sweet Bay Lane offers free parking and well-maintained dirt paths that need no permits. The climb is steady and manageable for visitors of varied hiking experience.

A wooden marker stands at the summit to help visitors identify the Santa Lucia Mountains and Edna Valley vineyards across the landscape. This reference point guides sightlines toward distant geographical features.

Location: California

Elevation above the sea: 236 m

GPS coordinates: 35.24498,-120.62230

Latest update: December 12, 2025 12:06