The best walks and hikes in Mystery Bay State Park
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Hiking in Mystery Bay State Park primarily involves exploring the extensive trail network of the adjacent Fort Flagler State Park. Mystery Bay itself is a marine park characterized by saltwater shoreline, offering views of the Olympic Mountains. The main hiking routes in the area navigate coastal forests and historic military sites on Marrowstone Island. This region provides a blend of marine recreation and forest trails.
Best hiking trails in Mystery Bay State Park
- The most popular hiking route is Fort…
Last updated: May 1, 2026
3
hikers
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
12
hikers
6.96km
01:52
80m
90m
Hike the easy 4.3-mile Fort Flagler Trail through wooded paths and saltwater shoreline, exploring historic military installations and enjoyi
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4
hikers
7.81km
02:06
100m
100m
Hike the moderate 4.9-mile Anti-Aircraft Battery Trail, Bluff Trail, and Lagoon Loop in Fort Flagler State Park, featuring history, ocean vi
3
hikers
6.71km
01:48
80m
80m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
4
hikers
5.30km
01:24
50m
50m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
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Popular around Mystery Bay State Park
Tips from the Community
Fort Flagler State Park is a 1,451-acre park surrounded by saltwater shoreline. The park offers hiking and biking trails, campsites, boat launches, and historical buildings available for overnight stays. You can visit the park's museum, which features exhibits about the fort's history. The park provides unparalleled views of the Olympic and Cascade mountains and Puget Sound.
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Uncover military history at Fort Flagler Historical State Park on Marrowstone Island's northern tip. This coastal defense fort, more than a century old, is part of the Puget Sound's defensive network, along with Fort Worden and Fort Casey. It's a must-visit for those keen on military, armament, and maritime history. Built in the late 1890s, it served during several wars and now houses a military museum in the old Quarter Master's Store House.
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This historical park allows you to step back in time while enjoying a peaceful run through the grounds. Fort Flagler was built in the late 1890s and was fully operational during World War I, World War II and the Korean War. There are multiple trail options, all surrounded by 19,100 feet of salty shoreline to appreciate. There are stunning views of Mount Baker in the distance, Juan de Fuca to the north, Whidbey Island to the east and the Olympic Peninsula to the west. You will encounter historic structures along the route, a museum, a campground and restrooms.
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Uncover military history at Fort Flagler Historical State Park on Marrowstone Island's northern tip. This coastal defense fort, more than a century old, is part of the Puget Sound's defensive network, along with Fort Worden and Fort Casey. It's a must-visit for those keen on military, armament, and maritime history. Built in the late 1890s, it served during several wars and now houses a military museum in the old Quarter Master's Store House.
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Located on a peninsula ma ma huge fort; Beautiful trails (bluff trail) lead above the cliffs and along the beach - in good weather views of Mount Baker and Mount Rainier.
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Frequently Asked Questions
Are dogs allowed in Mystery Bay State Park?
Yes, dogs are generally welcome in Washington State Parks, including Mystery Bay and the adjacent Fort Flagler State Park, as long as they are kept on a leash. It's always a good practice to check the latest park regulations before your visit. You can find more details on the official Mystery Bay State Park website.
Are there any easy, family-friendly trails in the area?
The area is well-suited for families. While Mystery Bay itself offers a gentle shoreline walk, the nearby Fort Flagler State Park has several easy trails. A great option is the Fort Flagler State Park loop from Marrowstone Wildlife Area, which is a relatively flat 4.2-mile (6.7 km) walk through coastal forest.
How does hiking at Mystery Bay compare to Fort Flagler State Park?
Mystery Bay State Park is a small, 10-acre marine park focused on shoreline walks, picnicking, and water activities. For more extensive hiking, most visitors head to the adjacent Fort Flagler Historical State Park. It's a much larger park with a wide network of trails that explore historic military batteries, coastal bluffs, and forests.
What can I expect to see while hiking around Mystery Bay?
The main highlights are the natural and historical features. You'll experience beautiful saltwater shorelines with views of the Olympic Mountains, walk through lush coastal forests, and discover historic military structures like old batteries and bunkers, particularly within Fort Flagler State Park. The calm waters of the bay are also great for spotting marine life and birds.
How long are the hiking trails in the Mystery Bay area?
The trails, primarily located in the adjacent Fort Flagler State Park, vary in length. Most routes are between 3 and 5 miles (5 to 8 km) and can be completed in under two hours. For example, the Battery Downes – Battery Lee loop from Maplewood Meadows is a 3.8-mile (6.2 km) trail that typically takes about 1 hour and 40 minutes.
Is it possible to walk between Mystery Bay and Fort Flagler?
Yes, the two parks are adjacent to each other on Marrowstone Island. You can easily walk from the shoreline of Mystery Bay into the trail system of Fort Flagler State Park to extend your hike.
Are there any circular or loop trails available?
Yes, the area features several excellent loop trails. A moderate option that combines coastal views with historic sites is the Fort Flagler State Park loop — Port Townsend. This 4.9-mile (7.8 km) circuit is a favorite for exploring the diverse landscapes of the park.
What do other hikers think of the trails in this area?
The hiking routes around Mystery Bay State Park are well-regarded by the komoot community, holding an average rating of 4.5 stars. Hikers often praise the combination of coastal scenery, quiet forest paths, and the unique historical elements of Fort Flagler.
What are the parking facilities like at Mystery Bay State Park?
Mystery Bay State Park has a parking area available for visitors. Keep in mind that a Discover Pass is required for vehicle access to Washington State Parks. The park can be popular, especially on sunny weekends, so arriving earlier in the day is a good idea.
Can I go camping in Mystery Bay State Park?
Mystery Bay State Park itself is a day-use park and does not offer overnight camping. However, the neighboring Fort Flagler Historical State Park has extensive campgrounds, including sites with excellent water views, making it a great base for exploring the island's trails.
Are there any other activities besides hiking?
Absolutely. Mystery Bay is a hub for water-based recreation. The calm waters are ideal for kayaking, paddleboarding, and boating, with a boat launch and dock available. Fishing, crabbing, and exploring the tidal flats at low tide are also very popular activities.
How many hiking routes are there to choose from?
There are over 15 designated hiking routes in and around the Mystery Bay area, primarily within the expansive Fort Flagler State Park. These range from easy shoreline strolls to more moderate forest loops, offering plenty of options for a day of exploration.
Most popular routes in Mystery Bay State Park
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