Damage to shelterwood leave trees and to understory trees in shelterwood and clearcut logging units logged with skyline yarders was measured, and related to stand conditions, harvesting specifications, and yarding system-terrain interactions. About 23 percent of the marked leave trees in the shelterwood units were killed in logging, and about 10 percent had moderate to serious damage. About 40 percent of the understory trees ·were killed. Heaviest damage in shelterwood was associated with steeper slopes, more trees per acre, and cross-slope angle to the skyline. Understory damage was greater on larger saplings than on seedlings.