Edgewood County Park and Natural Preserve in San Mateo County, California, is a 467-acre protected landscape known for spring wildflowers, serpentine soil, and exceptional biological diversity. Its grasslands, chaparral, coastal scrub, foothill woodlands, and wetlands support more than 500 species, including federally listed endangered and threatened plants and animals such as the Bay checkerspot butterfly. Ecologically, it contains all major zones of the San Francisco Peninsula except redwood forest. The park’s preservation followed decades of conflict over proposed development, including a golf course, until studies showed protected habitat would be harmed and county supervisors in 1993 designated the entire park a Natural Preserve.