Pseudacris (Hyla) regilla? (northern pacific treefrog)

This species is very variable and tend to be between 3/4 to 2 inch.
Would be my best guess, check a soundfile of one here:

http://www.amphibiaweb.org/sounds/Ps...s_regilla1.wav

or

http://www.californiaherps.com/frogs...la.sounds.html