Captive-bred frogs released at Bluff Lake as mountain yellow-legged frog recovery hits 10,000 mark

Bluff Lake in Big Bear Valley is one of a handful of southern California mountain habitats where conservationists are trying to pull a native frog back from the edge of extinction. The San Diego Zoo Wildlife Alliance and its partners released more than 3,000 mountain yellow-legged frogs and tadpoles during 2026, pushing the cumulative total of captive-bred specimens returned to the wild past 10,000^[1]. Before the recovery effort began, fewer than 200 of the frogs remained in the wild^[1].

The species receiving those releases at Bluff Lake is Rana muscosa, the southern mountain yellow-legged frog, which is native to the mountain ranges of southern California. A closely related species, Rana sierrae, occupies the central and northern Sierra Nevada^[1]. Both are federally listed as endangered.

The program is broader than simply releasing animals. The effort combines captive breeding, genetics work, disease control, habitat restoration, and long-term population monitoring^[1] — an approach designed to address the chytrid fungus outbreaks and habitat degradation that drove the frogs' numbers so low in the first place.

What the program's long-term footprint means for Bluff Lake — a popular recreation area for hikers and anglers — has not been detailed in materials released by the conservation partners. Local reaction from recreation groups and independent scientific assessment of reintroduction success rates in Big Bear Valley specifically were not available in current reporting.

Residents who visit Bluff Lake and observe frogs or unusual wildlife activity can report sightings to the San Diego Zoo Wildlife Alliance's conservation program.