McGrath State Beach, State beach and nature preserve in Oxnard, California, US

McGrath State Beach is a coastal area with sand dunes and wetlands along the Pacific Ocean in Oxnard. The shoreline extends roughly two miles and includes the Santa Clara River estuary where freshwater and salt water meet.

McGrath State Beach is a California state park on the south bank of the Santa Clara River mouth in Oxnard, established on land that later proved to sit atop the West Montalvo Oil Field. A rusting sewage pipe and repeated winter flooding of the estuary closed the campground in 2011 until repairs were made, and a 2015 study proposed moving the campground to higher ground within the park.

The park's name comes from the McGrath family, who donated the land for public use. Visitors today walk the nature trail to the Santa Clara Estuary Natural Preserve, and the beach lies on both the Pacific Coast Bicycle Route and the California Coastal Trail.

The beach offers camping areas and trails for walking or watching birds. Visitors have direct access to the water for swimming, surfing, and fishing but should pay attention to tides and weather conditions.

The wetland here shelters over 240 bird species that stop here during migrations between North and South America. The bird diversity makes the location one of the most valuable habitats along the California coast.