Quercus rubra A moderate to fast growing tree found in the mountains and piedmont, rarely in the coastal plain. Red oak is a medium tree reaching 80-100 feet in height and 3-4 feet in diameter. Open grown trees tend to have short boles and massive crowns. In the forest environment, trees develop a tall, straight bole with a small, round, compact crown. Red oak makes its best development on deep, well-drained, loamy soils. It is classified as intermediate in shade tolerance. Northern red oak is one of the most important lumber producing species in the red oak group. The large acorns are an important food source for many wildlife species. Northern red oak has been extensively planted as an ornamental because of its spreading crown and deep red autumn color.