Quercus pacifica is a shrub or a small tree growing up to 5 meters (16 feet) in height, or occasionally taller.

[3] The leaves are roughly oval in shape and edged with pointed teeth.

[4] Though limited to three islands, it is not uncommon there, occurring in grassland, chaparral, oak woodlands, forest, and other habitat.

[8] This oak species is threatened by a pathogenic honey fungus (Armillaria sp.

), which has been noted to infect trees already stressed by the activity of feral herbivores, including goats and pigs.