The bark on younger trees is thin, smooth, gray with numerous resin-bearing pockets. Older bark is thicker, reddish-brown to light gray and broken into irregular, flattened scales. Pollination occurs in the spring and cones mature in one season. Cones are barrel-shaped, about 3 to 6 inches long, and mature in early fall. Cones are upright and generally disintegrate after seeds are shed.
White fir is tolerant of a considerable amount of shade.
Its best growth is on moist loamy soils, but may often be found on dry, thin soils. The species seldom occurs in pure stands but grows in association with numerous other species depending on location and elevation. White fir is commonly found with Douglas-fir, sugar pine, ponderosa pine, and red fir. White fir is severely damaged by mistletoe. Leaves of white fir are often attacked by spruce budworm and Douglas-fir tussock moth.