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Cascadia Marine Trail - Posey Island
Public Campground

Cascadia Marine Trail - Posey Island

Photos shown are stock images and may not represent the actual campground.

About Cascadia Marine Trail - Posey Island

No water. Whole island is CMT campsite (human / wind powered only), but also a popular stop for lunch with tour groups. The two designated Cascadia Marine Trail campsites are close together, near toilet.

Tucked away in the pristine waters of the Pacific Northwest, Posey Island offers RV campers a rare opportunity to experience one of Washington's most remote and pristine marine environments. This intimate public campground with just two sites represents the kind of exclusive, off-the-beaten-path experience that many RV travelers dream about but rarely find. The island sits within the San Juan Islands, a archipelago renowned for its dramatic natural beauty, abundant wildlife, and peaceful isolation from the hustle and bustle of mainland life.

The Cascadia Marine Trail network connects a series of primitive campsites accessible primarily by water, making Posey Island a destination for those seeking genuine solitude and connection with nature. The journey to reach these two precious campsites is part of the adventure itself, rewarding intrepid travelers with an experience far removed from typical RV park amenities. This is camping in its purest form, where the focus shifts entirely to the natural world surrounding you.

What makes this area truly special is the incredible wildlife viewing opportunities and the sense of being genuinely remote. The San Juan Islands are famous for marine life encounters, including orcas, sea lions, eagles, and countless seabirds. Kayaking around the island and exploring the surrounding waters provides endless entertainment and photo opportunities. The waters here are relatively calm and protected, offering safe passage for small boats and excellent conditions for observing marine life in their natural habitat.

The landscape features rocky shorelines, evergreen forests, and unobstructed views of the surrounding water and distant peaks. Stargazing from Posey Island is extraordinary, with minimal light pollution revealing the full splendor of the night sky. Sunrises and sunsets paint the water in brilliant colors, creating the kind of moments that make camping memorable.

This destination appeals most to experienced RV travelers and boaters who are comfortable with primitive conditions and water-based access. Those seeking tranquility, natural beauty, wildlife viewing, and authentic wilderness camping will find Posey Island deeply rewarding. It's an ideal stop for adventurers exploring the San Juan Islands and those looking to truly disconnect and recharge.
2

Total Sites

Park Details

Total Sites 2

Tips & Tricks

Book Early

Friday Harbor is popular during peak season. Reserve 2-4 weeks in advance for weekends and holidays.

Check-in Time

Most parks have check-in after 1:00 PM and check-out by 11:00 AM. Call ahead if you'll arrive late.

Local Weather

Washington weather can change quickly. Pack layers and check the forecast for Friday Harbor.

Explore the Area

Don't miss local attractions near Friday Harbor. Ask the camp host for hidden gems and trails.

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