A species of potentially huge size, many small trees grow throughout the Park at low elevations in seasonally wet habitat; in places Western Redcedar is an important component of lowland forests. Here it is muted in morning frost.

Some of the largest trees grow at the Grove of the Patriarchs on the southeast side of the Park. The reddish bark shreds easily and has been used for many items. The trees are often buttressed and may reach over 150 feet in height.

The scalelike leaves are paired on the branches and are pointed at the end. The cones are small and egg-shaped.