Historically a shifting riverine sand dune ecosystem, the Antioch Dunes National Wildlife Refuge supports the last known populations of the endangered Antioch Dunes evening primrose, the Contra Costa wallflower, and the Lange's metalmark butterfly.
December Docent Tour Cancellations

For the month of December, tours of Antioch Dunes are being cancelled. The tours will resume as soon as possible! 

Visit Us

Due to the sensitive nature of the habitat, the refuge is closed to the public. However, our docent-led tours are back. See below for details. 

Location and Contact Information

      About Us

      The refuge was established in 1980 to protect plants and insects federally listed as endangered: Lange's metalmark butterfly (Apodemia mormo langei), Contra Costa wallflower (Erysimum capitatum var. angustatum), and Antioch Dunes evening primrose (Oenothera deltoides var. howellii). The refuge is the only known location in the world where the Lange's metalmark butterfly is found. Once part of an extended riverine sand dune ecosystem, the dunes of the refuge hosted a variety of endemic plants and insects. During the last 150 years, the dune ecosystem was seriously degraded by sand mining (removal), invasive plants, and other threats. Today, the refuge represents one of the last remaining riverine sand dune environments in the Sacramento–San Joaquin Delta.


      Docent-led tours are BACK!
      Time to get outside again and enjoy a stroll through the dunes.
      Our knowledgeable and fun docents lead a free 1-1.5-hour tour through the dunes every second Saturday of the month throughout the year. 
      Many spring flowers are in full bloom, including the magnificent endangered species, Antioch Dunes Evening Primrose. No registration necessary.

      Every second Saturday of the month at 10:00 a.m. throughout the year.

      Meet at: 

      501 Fulton Shipyard Road
      Antioch, CA 94509

      Note: If it is raining, the tour will be canceled. 

      What We Do

      Antioch Dunes National Wildlife Refuge was established to protect endangered plants and insects. All activities allowed on the refuge must be evaluated to ensure each activity is compatible with the purpose of the refuge.

      Our Species

      Projects and Research