The Western Chorus Frog is a small, smooth skinned treefrog.
Colour varies from green-gray to brown.
There is a dark stripe through the eye and a white stripe along the upper lip. It is distinguished from most other treefrogs by the three dark stripes down the back. In some individuals the stripes are broken. Maximum adult size about 4 cm. The breeding call is very similar to the Boreal Chorus Frog but is shorter and faster in pulse rate.