Pets on a leash no longer than 6 feet are allowed in some areas of Olympic National Park, located on Washington’s Olympic Peninsula. Pets are allowed in developed areas, drive in campgrounds and picnic areas, and on the following trails: Peabody Creek Trail (Olympic National Park Visitor Center in Port Angeles); Rialto Beach parking lot to Ellen Creek (1/2 mile); The beaches between the Hoh and Quinault Reservations (Kalaloch area); Madison Falls Trail (Elwha); Spruce Railroad Trail (North shore of Lake Crescent); and July Creek Loop Trail (North shore of Lake Quinault). Pets are not permitted on any other beaches, trails, meadows, or in any undeveloped area of the park.
More information on the Olympic National Park pet policy