The effects of timber harvest on deer mice and red-backed voles include: (1) First and second year clearcuts in mixed-wood aspen forests in northern Alberta were not acting as dispersal sinks for deer mice and red-backed voles. Instead deer mice had equal or larger densities and productivity in clearcuts. Whereas red-backed voles either did not live in clearcuts or had smaller similarly productive populations as the forest populations. (2) In summer 1994, red-backed voles lived in the clearcut portions surrounding residual patches in cutblocks, and not clearcuts lacking residual patches. The mechanism causing this difference is still unknown. (3) Higher densities of deer mice in the forest edge may be a function of individuals being drawn to the edge or overflow of individuals from higher density clearcuts. Red-backed voles showed varied trends, while survival rates showed no relationship with distance from edge.