Drainage ditches in central Washington that are fed by warm springs during the winter provided successful overwintering sites for many insects including both injurious and beneficial species. These insects and the host plants or habitat were identified. Six orders of insects were represented: Hemiptera (Heteroptera) (6 families), Hemiptera (Homoptera) (2 families), Diptera (15 families), Coleoptera (5 families), Hymenoptera (1 family), and Lepidoptera (2 families).