The flight activity of lesser grain borer, Rhyzopertha dominica (Fabricius), a major pest of stored wheat, was monitored in Dickinson County, Kansas, over a two-year period. Previous research has suggested that infestation of farm grain bins is the result of active entry into bins, but the source of these beetles and the temporal and spatial patterns of their flight activity are not well understood. A grid of 203 pheromone-baited traps was placed at approximately half-mile intervals along roads and near grain storage bins in a rural landscape 8 by 7 miles in area in Dickinson County, Kansas at 38.857O N, 97.094O W. Trap catches were monitored every two to three weeks. During both years early in the spring flight activity was concentrated near wooded riparian areas, not near farms. Within a month after initial capture in the spring, the area of high trap capture expanded to cover most of the study area before trap captures dropped to relatively low levels. Trap captures in 2003 showed that beetles were active from May until November with peak flight occurring in June, August, and October. Our findings suggest that wooded areas may be important over-wintering sites for this species, but further research is needed to determine if these locations actually support population development.