Seaquest State Park

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3030 Spirit Lake Hwy
Castle Rock, WA 98611

Seaquest State Park, located in Castle Rock, Washington, is a sprawling 475-acre year-round camping destination nestled among lush pines and the iconic Mount St. Helens volcano. The park offers a variety of amenities, including forested campgrounds, hiking trails, and a connection to the Mount St. Helens Interpretive Center via a pedestrian tunnel.

Visitors to Seaquest State Park can explore over 12 miles of hiking trails, partake in birdwatching at Silver Lake, and enjoy various camping options, including yurts and group sites. With a rich array of recreational activities and stunning natural vistas, it serves as a perfect retreat for outdoor enthusiasts and families alike.

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4.035 reviews
Photo of David L.
David L.
9/16/2022

Unfortunately, we arrived at this site after dark and left before dawn (therefore no photos), but the campsite was very easy to find and access even after hours. I would have liked to stay here...

Photo of Stefan T.
Stefan T.
8/6/2024

Beautiful park with views of Mt St. Helens. Old mossy trees and trails for days. Four legged friends and families here and people traveling through. A park with a forest of old trees and an...

Photo of Lynn R.
Lynn R.
2/3/2025

Love this location! So quiet and serene. Lots of trees and wildlife. Women's shower had no hot water, unfortunately I didn't figure this out until I was completely undressed. Had to wrap a...

Photo of Rose D.
Rose D.
10/21/2021

This review is strictly from a day-trip/hike aspect as we didn't camp there. You will need a Discover Pass to park or pay the day-use fee (currently $10 for the day or $30 for the annual Discover...

Photo of Cheryl W.
Cheryl W.
8/5/2023

Gorgeous camping spots, many are very tight to manage with a big rig. We didn't want to chance it, but it's spectacular if you have a smaller rig or are tent camping. Directly across the street...

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United StatesWashingtonCastle RockSeaquest State Park