The Boreal 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 into dashes or dots. Maximum adult size is just under 4 cm. The breeding call is very similar to the Western Chorus Frog , but is longer and slower in pulse rate.