Seaquest State Park - United States
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About Seaquest State Park
RV quick facts for Seaquest State Park
| Detail | Information |
|---|---|
| Max RV length | Up to 50 ft at select utility sites; many standard sites fit rigs around 30 to 35 ft |
| Full hookups | No full hookups; partial-hookup utility sites offer water and electric |
| Dump station | On-site dump station available to registered campers |
| Generator hours | Generators allowed during posted quiet-hour exceptions; quiet hours typically 10 p.m. to 6:30 a.m. |
| Cell service | Limited to moderate coverage; varies by carrier and campsite location |
| Reservation window | Bookings accepted up to 9 months in advance through Washington State Parks |
| Day-use pass | Discover Pass required for day-use parking; included with overnight camping fee |
| Pets | Pets allowed on leash, maximum 8 feet, and not permitted in buildings |
Featured RV rentals for Seaquest State Park
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Superhost
Best time to visit Seaquest State Park
Late June through early September is the prime window, with warm, mostly dry weather, all campground loops open, and full access up Spirit Lake Highway to the Coldwater Lake and Hummocks areas. Shoulder months of May, early June, and late September bring fewer crowds and easier reservations, though rain is more frequent and some monument facilities may operate on reduced hours. Winter visits are possible because the park stays open year-round, but expect cold, wet conditions and possible snow at higher elevations along SR-504.
Cold and very wet; campground open with limited services.
Wet winter conditions; SR-504 may have snow at upper viewpoints.
Cool and rainy shoulder season.
Spring rains; wildflowers begin around the park.
Mild and increasingly dry; good shoulder-season window for RVers.
Pleasant; reservations fill quickly for weekends.
Peak season; book well in advance.
Warm and dry; high demand and possible fire restrictions.
Quieter shoulder-season visits with cool evenings.
Fall colors arrive; rain increases.
Wet and cool; fewer campers.
Cold and rainy; campground open year-round, day-use trails wet.
Things to do at Seaquest State Park
- Mount St. Helens Visitor Center at Silver Lake EasyRV parking available
The state-run Mount St. Helens Visitor Center sits directly across SR-504 from Seaquest and is reachable on foot via a pedestrian tunnel. Exhibits cover the 1980 eruption, regional geology, and ecosystem recovery, with a boardwalk extending into Silver Lake's wetlands.
- Seaquest Park trail system EasyRV parking available
Seaquest contains several miles of forested hiking trails through second-growth conifer woods. Loops are mostly flat to gently rolling, suitable for casual walks straight from the campground.
- Silver Lake fishing and paddling EasyRV parking available
Silver Lake is a shallow lake known for largemouth bass, crappie, and trout. Public access points along SR-504 accommodate canoes, kayaks, and small fishing boats.
- Coldwater Lake day-use area EasyRV parking available
Coldwater Lake, formed by the 1980 eruption, sits near the current end of the drivable section of SR-504. The picnic and boating area offers paved parking, a boat launch, and the short Birth of a Lake interpretive trail with views of the blast zone.
- Hummocks Trail EasyRV parking available
The Hummocks Trail is a 2.3-mile loop along SR-504 that winds through mounds of debris left by the 1980 landslide. It is mostly level with interpretive signs and trailhead parking that accommodates RVs.
- Mount St. Helens Forest Learning Center EasyRV parking available
The seasonal Forest Learning Center along SR-504, operated by Weyerhaeuser, highlights forest recovery and replanting after the eruption. The site features interpretive exhibits, a Roosevelt elk viewing area, and large vehicle parking.
- Wildlife and bird watching at Silver Lake wetlands EasyRV parking available
The wetlands fringing Silver Lake support herons, ospreys, bald eagles, and waterfowl. Boardwalks at the visitor center provide quiet vantage points only a short walk from the campground.
Top Hosts near WA, United States
We had the best experience in this very cozy and comfortable RV!! The hosts were extremely flexible in timing and so easy to communicate with! They were very quick to communicate also! We will definitely rent this RV again!!
Kelly L. - Sep 2026
What a great experience!!! They have everything you can want in the rental and are super friendly and accommodating. I've owned several RV's and rented dozens and this was an easy process from the start. We will be looking to rent from them again.
Armand M. - Aug 2026
Had a very good time on this RV! Recommend to anyone!
Kirill V. - Jan 2026
I am so happy that we chose to rent from Andrey. We went on a 13 day trip with our 3 small kids, when we picked the RV up it was IMMACULATE. So clean, smelled amazing, and fully stocked with everything we could have needed. Even down to camp chairs for our kids. We had zero issues with it on our long trip, communication with the host was amazing, and I could not recommend him enough. Best experience ever!
Kayla F. - Oct 2024
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RV Rentals Seaquest State Park
Seaquest State Park, WA, United States
How to get to Seaquest State Park
Seaquest sits about 5 miles east of Castle Rock and Interstate 5 (Exit 49) along State Route 504, roughly a 2 hour drive from Seattle (about 130 miles north) and 1 hour from Portland, Oregon (about 50 miles south). RV drivers should note that Johnston Ridge Observatory is currently unreachable due to a 2023 landslide that closed both lanes of State Route 504, so the drivable end-of-road destinations are now the Coldwater Lake area and Hummocks Trail near milepost 43-45. SR-504 east of the park climbs steadily with sustained grades, sweeping curves, and limited turnarounds, so trailers and larger motorhomes are best left at the campground when day-tripping deep into the monument. There are no tunnels or low clearances on the I-5 approach. The nearest major airport for fly-and-rent travelers is Portland International Airport (PDX), about 75 miles south.
RVezy vs. Traditional RV rental
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- Limited fleet from a rental company
- Exact RV not guaranteed
- Pickup only at retail locations
- Fewer RV types and less availability