Posey Island Marine State Park

Posey Island, Washington · Campsite openings, cancellations & sold-out date alerts

IslandsWatched around the clock

Weekend availability

Live from Washington State Parks · checked Sep 16, 11:26 AM PT

Sold out 1 of the next 6 weekends — exactly when cancellation alerts earn their keep.

  • Fri, Sep 18
    Sold out
  • Fri, Sep 25
    Open
    1/1 campgrounds
  • Fri, Oct 2
    Open
    1/1 campgrounds
  • Fri, Oct 9
    Open
    1/1 campgrounds
  • Fri, Oct 16
    Open
    1/1 campgrounds
  • Fri, Oct 23
    Open
    1/1 campgrounds
Alert me when a sold-out weekend opens

Sold out for your dates? We'll tell you the second a site opens.

Cancellations at Posey Island Marine State Park get rebooked in minutes. We check Washington State Parks around the clock and alert you before the crowd refreshes the page.

Set an alert for Posey Island$9.99/mo — why we charge

Not ready to subscribe? Get a free weekend heads-up.

We'll email you if Posey Island Marine State Park opens up for a weekend you pick. No account needed.

Park type

Islands

Washington State Parks system

Online booking

Available on Washington State Parks

Official state reservation system

Alert coverage

Checked around the clock

Openings, cancellations & new dates

Where Posey Island Marine State Park is

Posey Island, WA 98028

48.6187, -123.1681

Get directions

Getting a campsite at Posey Island Marine State Park

How do I get a campsite at Posey Island Marine State Park when it's sold out?

Cancellations happen constantly — the trick is being first to know. Set an alert for your dates and we'll watch Posey Island Marine State Park on Washington State Parks around the clock, then notify you the moment a site opens. Alerts run on a Pro subscription ($9.99/mo, cancel anytime).

When do campsites usually open up at Posey Island Marine State Park?

Whenever someone cancels. Most reservation systems refund less the closer you get to arrival, so cancellations cluster in the days before a stay — but the openings themselves are unpredictable, which is exactly why watching for them beats refreshing the page.

Where do I book a campsite at Posey Island Marine State Park?

Reservations for Posey Island Marine State Park are made on Washington State Parks, the official booking system for Washington State Parks. GetParkAlerts is independent — we tell you when a site opens; you book it directly on the official site.

Parks near Posey Island Marine State Park

Flexible on where you camp? Watch a few of these too — more parks, better odds.

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