Diamond Bar

City of Diamond Bar has rich biodiversity.

Diamond Bar, Chino Hills, Tres Hermanos, and Diamond Bar's Sphere of Influence are all located in one of 20 worldwide ecologically sensitive, biodiverse hot spots. This means that we live in a biogeographic region with significant levels of biodiversity, second only to tropical rain forests, that is threatened with destruction. See Map.

It is therefore critically important that we save what little remaining natural open space that we have left.

Oak Tree

City of Diamond Bar Oak Trees are at risk.

Oak trees and Oak woodlands are so important to California's ecology that they are protected under state law.

All of Diamond Bar and its sphere of influence is located in LA County's Potential Oak Woodlands Conservation Areas map. Why are Oaks so important? Read More. (42.0MB

LA County created this Oak Woodland Conservation map (4.88MB) in order to help cities properly conserve their precious Oak Trees.

Existing City tree protection codes fail to protect these native trees.

General Plan update process deeply flawed.

Existing condition reports omit important species and habitat.

For example, throughout the city, Coast Live Oak savanna, woodland, and riparian habitat have been ignored.

Considering Diamond Bar's extraordinary biodiversity habitats, rare and endangered species, this is an egregious omission.

Please get involved, and help us fix this subtle but dangerous attempt to ruin Diamond Bar's quality of life.

Because if these important aspects of city heritage are not properly recorded, developers will be free to destroy them.

Please click to: Get Involved


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Many Species of Birds Live Around Us,

California Gnatchatcher

including the federally protected California Gnatcatcher.

Scientific studies show that Diamond Bar and neighboring areas are surrounded by many species of birds. Read More.