The Bluebird Ranch Mountain Preserve (BRMP) was established to protect the federally listed as threatened and state listed as endangered thread-leaved brodiaea (Brodiaea filifolia), to preserve the historic property, secure the natural boundary between the Los Angeles metropolitan area and protected lands in the San Gabriel Mountains, afford opportunities for nature appreciation and to serve as an outdoor classroom, study and research lab, mitigation bank, and conservation/restoration projects. It has functioned in this capacity since 2006 thanks to its founders Drs. Ann and Jerry Croissant.

The BRMP is considered a key piece in maintaining regional Wildlife Corridors along the San Gabriel Foothills, allowing north-south and east-west wildlife movement. It is an important watershed property with springs that feed springs that feed Big and Little Dalton Creeks of the Walnut Creek Sub-watershed of the San Gabriel River. It also contains coastal sage scrub, chaparral, oak woodlands, and high-quality native grasslands that provide habitat for a myriad of wildlife.

The name "Bluebird Ranch Mountain Preserve" evokes western images of ranching and other human endeavors. While the “Bluebird” and “Preserve" in the name draws attention to the protection of one of many species found here, the entire name is more descriptive of past human use. As such, it does not invoke the uniqueness of this Preserve, the history of its creation, and its legacy in protecting resources and educating countless children and adults. Renaming this area to honor those who passionately worked to create the Preserve not only pays just tribute to their efforts, it brings to this area a specialness, an acknowledgment that where original human endeavors created a ranch for private human use, more enlightened efforts by these two people created a habitat preserve for plants and wildlife.