Posey Island Marine State Park
Washington State Parks · GoingToCamp
Posey Island Marine State Park in Washington has 7 open booking windows on GoingToCamp right now, the soonest Fri Sep 11–Mon Sep 14. Reserve directly through the booking link above — cancellations go fast. To catch future openings the instant they appear, set a free CampSage cancellation alert.
⚡ EV charging nearby
Nearest DC fast charging: 11.6 mi away (straight line).
Distances are straight-line, not driving — the road can be much longer where a river, a lake or a canyon sits in between. From OpenStreetMap — community-mapped, so plug types can lag reality. Verify on your charging network’s app before counting on a charger.
📊 How often sites open up here
CampSage's scans caught 16 openings at Posey Island Marine State Park over the last 30 days, on 14 separate days, most of them for stays anywhere from same-day to about 12 days out and the openings typically covered 2–3 nights.
These are the openings our own scans saw — not a figure the booking system publishes. We re-check availability several times a day, so the real number can be higher.
🏕️ About this campground
💡 Insider tips from campers
❓ Posey Island Marine State Park FAQ
How do I reserve a campsite at Posey Island Marine State Park?
Posey Island Marine State Park in Washington takes campsite reservations through GoingToCamp. On this page, use the “Book / check availability” button to open the live booking page, see which dates are free, and reserve your site.
How can I get a spot at Posey Island Marine State Park when it's fully booked?
Popular campgrounds like Posey Island Marine State Park often fill months ahead, but campers cancel every day and those sites reopen for booking. CampSage checks availability for you and sends a free email the instant a cancellation opens — set an alert on this page and you can grab the spot before anyone else.
How often do campsites open up at Posey Island Marine State Park?
CampSage's scans caught 16 openings at Posey Island Marine State Park over the last 30 days, on 14 separate days, most of them for stays anywhere from same-day to about 12 days out and the openings typically covered 2–3 nights. These are the openings our own scans saw — not a figure the booking system publishes. We re-check availability several times a day, so the real number can be higher.
Where is Posey Island Marine State Park located?
Posey Island Marine State Park is located in Washington · Puget Sound & North, Washington. Tap “Directions” above for driving directions, or see nearby campgrounds lower on this page.
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