Seaquest State Park — RV Camping in Castle Rock, WA

Seaquest State Park is a 475-acre camping destination nestled among lush Douglas fir trees in Castle Rock, Washington, just steps from the iconic Mount St. Helens. Positioned along Spirit Lake Highway, this Pacific Northwest gem offers easy access to the Mount St. Helens Interpretive Center via a pedestrian tunnel, making it a premier base camp for volcano enthusiasts and nature lovers alike. The park features over 12 miles of hiking and biking trails, including a scenic boardwalk over wetlands ideal for birdwatching and wildlife viewing. Campers can choose from standard, partial hookup, and full hookup sites accommodating big rigs up to 50 feet, with 30-amp and water and sewer hookup options available. Pull-through sites, a dump station, hot showers, flush toilets, and picnic tables with grills ensure a comfortable stay. Recreational amenities include a playground, fishing opportunities, and firewood for sale. The amphitheater and group facilities add to the park's appeal for families and organized groups. With Wi-Fi on-site and reservations managed through Washington's GoingToCamp system, Seaquest State Park delivers a well-equipped, scenic RV camping experience in the heart of southwestern Washington's volcanic landscape.