Two woodland types occur in Carlsbad: oak woodland and eucalyptus woodland.
Oak woodland is dominated by coast live oak, with scattered individuals of other tree species.
Eucalyptus woodland is a non-native community. It is dominated by various species of planted eucalyptus that survived around old dwellings, or in entire groves (e.g. the Hosp Grove). the understory is usually poorly developed or absent owing to the toxic effect of the eucalyptus leaves that acts to inhibit the growth of other plants. Although this habitat supports no sensitive plant or animal species, it is often used for nesting by raptors and other birds, or for nesting by bats.