Adult treefrogs have a dark mask that extends from the tip of the nose across the eyes to the shoulders. Coloration varies between individuals, ranging from green or reddish to brown or gray. Most have dark blotches along their sides with light colored bumpy undersides.

They have special skin glands that produce a waxy coating to keep their skin moist. Male treefrogs have a dark gray, inflatable throat pouch during the breeding season. As the smallest frog species in Oregon, adult Northern Pacific treefrogs only grow to two inches in length.

During the non-breeding season, this treefrog is found in various habitats that can be quite distant from water, including wet meadows, riparian areas, woodlands and brush habitats and pastures and disturbed areas. They may even find shelter in tree cavities. Individuals living east of the Cascades move into underground burrows dug by other animals or stay in streams or springs during times of dry weather. They are inactive during freezing weather.

Photo by Susan Barnes, ODFW

More detailed information on Northern Pacific treefrog can be found here.