Technical Abstract: Yellow woodsorrel is a perennial weed invading no-till rotations in eastern South Dakota. This study quantified the seedling emergence pattern of yellow woodsorrel across a four-year period. Yellow woodsorrel began emerging in early May and continued for 14 weeks. Approximately 80% of seedlings emerged during the six-week interval between May 9 and June 15, but some seedlings continued to emerge during July. Comparing no-till and conventional tillage, the total number of seedlings that emerged yearly was 3 times higher in no-till. The emergence pattern, however, did not differ between tillage systems. The growth period of yellow woodsorrel was quite short. In established stands, seedlings began flowering 4 weeks after emergence and dispersing seeds after 8 weeks of growth. Based on observations of yellow woodsorrel in production fields, we suggest that adding crops such as canola or alfalfa to the rotation may help manage this weed.