Double Bluff Beach, County beach park in Whidbey Island, United States

Double Bluff Beach is a roughly two-mile public beach on southern Whidbey Island along Admiralty Inlet, with tidelands forming Double Bluff State Park and the uplands and access run by Island County. Its shore is shifting sand eroded from bluffs up to 300 feet high, mixed with fields of pebbles, driftwood, slabs of peat and glacial erratic boulders. The exposed bluff face shows distinct strata, from Double Bluff Glaciation deposits at the base to Possession Glaciation drift at the top.

The bluffs expose strata from the Double Bluff Glaciation (150,000–200,000 years ago) at the base, the Whidbey Formation in the middle, and Possession Glaciation drift (about 70,000 years ago) at the top. Erosion by wind, rain, tides and the South Whidbey Island Fault continues to cut the face, and mammoth teeth and tusks have been found eroding out of it.

Clamming is a licensed activity at Double Bluff, and visitors can dig for clams in the exposed tidelands of Useless Bay, where the shallow slope stretches over 2,500 feet between high and low tide. Beachgoers also build huts from the driftwood that litters the shore.

The parking lot is about two miles from Freeland's retail core. The beach is roughly two miles long, with a shallow slope in Useless Bay where the distance between high and low tidelines can exceed 2,500 feet. Dogs are allowed off leash. Clamming requires a license.

On clear days, this location reveals rare simultaneous views of multiple mountain ranges and Seattle's skyline all at once. This combination of ocean and mountain vistas makes the spot an unusual viewing point along the coast.