Ceanothus parryi is an erectshrub approaching 5 meters in maximum height. The woody parts are reddish brown and woolly when new, darkening with age and shedding most of the hairs. The evergreen leaves are alternately arranged, oval in shape and edged with glandular teeth. They are dark green and hairless on the uppersurfaces, paler and woolly on the undersides. The inflorescence is a long cluster of deep blue flowers, up to about 15 centimeters long. The fruit is a smooth, 3-lobed capsule a few millimeters long.