Trinidad State Beach is 20 miles (30 km) north of Eureka in Humboldt County, California. This scenic state beach is accessed from a signposted side road at Trinity Street and Stagecoach Road in the seaside town of Trinidad. The parking lot at Trinidad Bay below Trinidad Head is another popular access point. The offshore rocks are part of the California Coastal National Monument. Colorful tide pools provide specimens to Humboldt State University's Fred Telonicher Marine Laboratory located in Trinidad.
Nearby parks include Little River State Beach just south of Trinidad and to the north, Patrick's Point State Park. The Beach's latitude and longitude are 41.0594 / -124.1420.