Field pansy (Viola rafinesquii) is a problem weed in northeast Kansas no-till fields. It is a winter annual native to North America, that can germinate either in fall or spring. Farmers report that some spring burndown treatments give poor or erratic control. Field studies were conducted over three years to evaluate various herbicide tank-mix combinations at two application timings (fall and spring), for field pansy control ahead of either corn or soybeans. Ahead of corn, the more consistent treatments included atrazine with paraquat, mesotrione, isoxaflutole, or simazine, applied in fall or spring. Ahead of soybean, fall applications with both burn down and soil residual activity were usually more effective than spring applications.