Jarrell Cove State Park, Marine recreational park on Harstine Island, United States.

Jarrell Cove State Park covers 67 acres of forest on Harstine Island, with 3,500 feet of saltwater shoreline on south Puget Sound. The park has campsites, trails, and boat access, and it administers five satellite state parks: Eagle Island, Harstine Island, Hope Island, McMicken Island, and Stretch Point.

The park was established in 1953 as a recreational area and received a name revision in 1966 at the request of local residents. This change marked its evolution as a destination for boaters and waterfront visitors.

The park's name was corrected from Gerald Cove to Jarrell Cove in 1966 at the request of the Hartstene Island Grange. It also administers five satellite parks: Eagle Island, Harstine Island, Hope Island, McMicken Island, and Stretch Point. Harstine Island park is a day-use area 2 miles away, reached by a 0.5-mile trail to the beach.

The park sits on the east side of Harstine Island, reached by road from the island's main route; the satellite Harstine Island day-use area lies 2 miles (3.2 km) away, with beach access by a 0.5-mile (0.80 m) trail. Boaters find mooring buoys and docks along 3,500 feet (1,100 m) of saltwater shoreline. Campsites are set among the forest.

The park manages several outpost islands that provide additional anchorages throughout the southern Puget Sound region. These satellite locations allow boaters to explore the waterway across multiple landing points.