This was once known as a Pacific Tree Frog, Pseudacris regilla, but due to a (controversial) change in taxonomy in 2006, it's now a Sierran Chorus Frog, Pseudacris Sierra.
http://nas.er.usgs.gov/queries/factsheet.aspx?SpeciesID=2780
At 11,500' on the south-east slope of Finger Peak. July 12, 2015.