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Reopening for 2026. Hours, dates, and admission may vary — check official site for current details. Last verified: 8/31/2026 Grimm's Hollow is the Bay Area's premier family Halloween adventure! An experiential journey and a fully immersive attraction for all ages! This year's adventure will take visitors beneath the waves on a self-guided tour through The Pirate’s Abyss, where adults and children will interact with an amazing array of characters and take in the spooky sights both above and below the sea.
