Posey Island Marine State Park
Posey Island Marine State Park is a small, remote marine park in the San Juan Islands known for its primitive island camping, shoreline views, and excellent kayaking and boating access. Visitors come for quiet beaches, wildlife watching, and a true low-impact island experience.
Free
Visiting with Dogs
Dogs allowed on leash; keep pets under control and clean up after them. Check seasonal or area-specific restrictions.
Visitor Tips & Reviews
What Visitors Say
Quiet island getaway with beautiful water views, excellent kayaking, camping, wildlife watching, and peaceful seclusion. Visitors love the remote feel, but note limited facilities and tide-dependent access.
Tips from Visitors
- Access by boat only; plan for tides and weather.
- Bring drinking water; no potable water on the island.
- Pack out all trash; facilities are very limited.
- Use designated campsites; reservations may be required in summer.
- Respect wildlife and keep noise low for a peaceful visit.
Best Time to Visit
The best time to visit Posey Island Marine State Park is late spring through early fall, when marine weather is milder and paddling conditions are more reliable. Summer offers the best chance for dry camping and long daylight hours.
Amenities
Nearby Attractions
Explore these attractions near Posey Island Marine State Park:
- Roche Harbor ResortHistoric marina village with dining, lodging, and boat services, commonly used as a launch point for island exploration.2 miles away
- San Juan Island National Historical ParkA nearby national park unit featuring historic sites, coastal scenery, and wildlife viewing opportunities on San Juan Island.8 miles away
- Lime Kiln Point State ParkA famous whale-watching destination on San Juan Island with lighthouse views and shoreline access.11 miles away
Things to Do at Posey Island Marine State Park
Camping at Posey Island Marine State Park
Primitive tent camping only on Posey Island; no RVs, cabins, or hookups. Seasonal, boat-access camping with limited facilities.
Hiking Trails
Posey Island Marine State Park offers a short, easy day hike with a true island feel. Visitors often enjoy the scenic shoreline, quiet forested paths, and excellent views of the water and nearby islands. The trail is simple and family-friendly, but access depends on a boat or kayak, making the outing feel more adventurous and secluded than a typical park hike.
Posey Island Loop Trail
EasyShort shoreline loop around the island with scenic views of the San Juan Islands, tide pools, and frequent wildlife sightings.
North Shore Beach Walk
EasyA gentle walk along the north side of the island with access to rocky shoreline and views toward Roche Harbor and nearby islands.
South Shore Exploration Path
EasyA simple path along the south shoreline offering quiet coves, driftwood, and excellent sunset viewpoints.
Island Perimeter Traverse
EasyA full island circuit combining beach walking and short interior connectors for a complete tour of Posey Island's natural features.
Directions
Reach the park by boat or kayak from Roche Harbor or nearby San Juan Islands waters. There is no road access; launch from a marina or shoreline access point and follow marine charts to the island.
Contact & Info
Frequently Asked Questions
How do I get to Posey Island Marine State Park?
The park is only accessible by boat, kayak, or other watercraft. Most visitors launch from nearby San Juan Island or Roche Harbor and paddle or boat over. There is no road access or ferry service directly to the island.
Can I camp on Posey Island?
Yes, but camping is primitive and limited. Visitors usually mention a small, rustic campsite with basic amenities only. Bring everything you need, including water, and expect a true backcountry-style experience.
Are there restrooms or drinking water on the island?
Amenities are very limited. Reviews commonly note that there are no drinking water sources, and restroom facilities may be minimal or absent depending on conditions. Plan to pack out waste and bring all necessary supplies.
What is the island like for kayaking or paddling?
Posey Island is popular with kayakers because it is a short, scenic paddle from nearby launch points. Visitors often describe calm, beautiful waters, but conditions can change quickly with tides and weather, so check forecasts before going.
Is Posey Island good for wildlife viewing?
Yes. Visitors often report seeing seabirds, marine life, and sometimes seals or otters nearby. The island’s quiet setting makes it a nice spot for nature watching, especially early in the day or during calmer weather.
What should I know before visiting Posey Island?
Bring all food, water, and camping gear, and be prepared for a remote, low-service visit. Reviews often mention that the island is small, peaceful, and best for people who enjoy simple, quiet outdoor trips.
Don’t Forget the Essentials
Essential camping & hiking gear we recommend to make your park trip easier and more comfortable.
View Gear Checklist →