Best Environmental Organization Antioch Near Me

4worldlovers: 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.

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.

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. capitatum), 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.

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.