Fee: Discover Pass required: $10 day / $45 annual. Other fees: trailer dump $5/use; other entrance fees vary. Reservations: Washington State Parks reservation system
About this park
Seaquest is a 475-acre year-round camping park among fir trees in the shadow of Mount St. Helens. It has forested campgrounds, hiking trails and mountain views. The park is open 8 a.m. to dusk year round.
Seaquest State Park FAQ
Where is Seaquest State Park located?
Seaquest State Park is in Castle Rock, Washington, at 3030 Spirit Lake Highway. GPS coordinates: 46.29595, -122.81765. Get directions.
Is there an entrance fee at Seaquest State Park?
Discover Pass required: $10 day / $45 annual. Other fees: trailer dump $5/use; other entrance fees vary. Reservations: Washington State Parks reservation system. Fees can change by season, so confirm with the park before you go.
How do I contact Seaquest State Park?
You can call (360) 644-5235. The park office can confirm RV site availability, hookups, length limits and current conditions.
Are there RV campgrounds near Seaquest State Park?
Yes. The closest RV-friendly campgrounds listed on ParkedRV are:
- Iron Creek Campground (40.7 mi, reservable)
- Tower Rock Campground (46.4 mi, reservable)
- Paradise Creek campground (48.5 mi, reservable)
How current is this information about Seaquest State Park?
This listing was last updated on October 8, 2026. If something is out of date, let us know and we'll fix it.