Although the Western Wood-Pewee (Contopus sordidulus) has a large western North American breeding distribution, little is known about its reproductive biology (Bent 1942; Murphy 1983; Curson 1996). Here, we provide information on the nest-site characteristics and nesting success of the Western Wood-Pewee in Ponderosa Pine (Pinus ponderosa) forests in the foothills of Colorado.