- Fort Casey State Park (including Keystone Spit) is comprised of 411 acres with 7,000 feet of freshwater frontage and 10,800 feet of saltwater shoreline on Admiralty Inlet. There are two boat launching ramps with grounding floats and an underwater park area.
Areas of interest are a lighthouse/interpretive center, historic bunker structures and 1.25 miles of trail.
Camping facilities include 63 picnic sites, 35 standard sites, three primitive tent sites, five comfort stations and 400 parking sites. Water is supplied by the town of Coupeville.
Recreation - Activities enjoyed in the park include camping, picnicking, boating, fishing, scuba diving, hiking, driftwood collecting, interpretation, and clamming.
Climate - Washington's climate varies with each region. Fort Casey State Park is located in an area "protected" by surrounding ocean waters and mountain ranges. Temperatures are consistently moderate, rarely topping 80 degrees in the summer and rarely falling below 30 degrees in the winter.
Annual rainfall averages 26 inches, approximately half that of Seattle. In the summer months, and especially during July and August, the park may go for weeks without a cloud in the sky. Snowfalls occur mainly in January and February and usually total only one or two inches. Northeast winds may cause temperature extremes.
Island tides range over 14 feet. The extreme low tide of 4.0 feet to the extreme high tide of over 10 feet.
The park is located on State Highway 20, three miles south of Coupeville on Whidbey Island in Island County.