About
Mystery Bay State Park is a shore access point in Jefferson County, Washington. Leashed dogs are welcome here. Note that dogs are not allowed on designated swimming beaches year-round (WAC 352-32-060) — check posted signs. The setting features a rocky shore. Visitors will find drinking water, parking, a picnic area, and restrooms on site. It's a good spot for boating. An entry fee applies.
Features & activities
Access
Natural features
Amenities
Activities
Accessibility
Rules & Restrictions
Photos from visitors
Confidence
Confirmed by multiple sources
How trustworthy this beach's dog-friendly status is
Popularity — how loved
83Excellent
How loved this beach is — saves, visits, star reviews & Google popularity
Star ratings and Google reviews (our stand-in for web popularity) set the base score; saves and visits from Sandy Pup users then add a boost on top — up to 30 points, growing as more people engage — so community love can lift a beach, never sink it. Every count uses a diminishing-returns curve (the first few matter most), and signals with no data yet are skipped — never counted against the beach.
Frequently asked questions
Are dogs allowed at Mystery Bay State Park?
Yes — dogs are welcome at Mystery Bay State Park on a leash.
Do dogs need to be leashed at Mystery Bay State Park?
Yes — dogs must be kept on a leash at Mystery Bay State Park.
Are there seasonal dog rules at Mystery Bay State Park?
Yes. Dogs are not allowed on designated swimming beaches year-round (WAC 352-32-060) — check posted signs.
Is there parking at Mystery Bay State Park?
Yes, there is parking on site.
Are there restrooms at Mystery Bay State Park?
Yes, restrooms are available on site.
Is there a fee to visit Mystery Bay State Park?
Yes — an entry fee applies at Mystery Bay State Park.
Is Mystery Bay State Park wheelchair accessible?
No — this site isn't listed as wheelchair accessible.
What can you do at Mystery Bay State Park?
Popular activities at Mystery Bay State Park include boating.
What is the setting like at Mystery Bay State Park?
Expect a rocky shore.
Reviews
Data sources
Nearby beaches