Harmony Headlands State Park preserves an undeveloped parcel of Pacific coast in California, United States. Located in San Luis Obispo County on Highway 1, the park is the only public access to the coast between the towns of Cayucos and Harmony. The 748-acre park was established in 2003. The Cayucos Land Conservancy helped facilitate and fund the park's development. Harmony Headlands State Park is open for day-use only. Dogs and bikes are not allowed on the trails.