February 28, 2000 – The Center and the Pacific Rivers Council submitted a formal petition to list the Yosemite toad under the Endangered Species Act. The U.S. Fish and Wildlife Service issued a finding that the petition presented substantial information indicating listing might be warranted.
May 31, 2001 – The Center filed suit against the Service for stalling Endangered Species Act protection for the Yosemite toad. The Service was ordered by the Northern District Court to make a final listing determination for the species.
December 10, 2002 – The Service declared that although the toad warranted listing as an endangered species, it would not issue a listing proposal because of "higher priority" listings. Instead, the species was placed on the "warranted-but-precluded" list to remain a candidate for listing.
July 15, 2009 – The Center and other conservation groups offered a $1,500 reward for information leading to the identification and conviction of dirt bikers who damaged Groundhog Meadow in the Sierra Nevadas — vital habitat for the Yosemite toad.
July 12, 2011 – The Center struck a historic legal settlement with the U.S. Fish and Wildlife Service, requiring the agency to make initial or final Endangered Species Act decisions on 757 imperiled plants and animals — including the Yosemite toad — by 2018.
April 24, 2013 – In accordance with our 2011 agreement, the Service proposed federal Endangered Species Act protection for Yosemite toads and Sierra Nevada yellow-legged frogs, along with more than 2 million acres of proposed critical habitat across the Sierra Nevada mountains. The critical habitat proposed specifically for the Yosemite toad included 750,926 acres in Alpine, Tuolumne, Mono, Mariposa, Madera, Fresno and Inyo counties, California.