It has been more than a decade since the North American Guidelines for Children's Agricultural Tasks (NAGCAT) were released to assist parents in assigning developmentally appropriate and safe farm work to their children ages 7-16 years. Since NAGCAT were released, a growing body of scientific evidence has accumulated related to the content and application of these work guidelines. The purpose of this project was to update the NAGCAT tractor guidelines based on review of the scientific literature and the recommendations of a core group of scientists to the NAGCAT project. A synthesis of the peer-reviewed literature surrounding NAGCAT content and application was conducted. A panel of childhood agricultural safety and health researchers and practitioners was convened to review and discuss the literature synthesis, add programmatic evidence from their own work with youth and tractors, and develop consensus recommendations for updating the NAGCAT tractor guidelines. The consensus recommendations included: 1) dropping the youngest age group (12-13 years) from the NAGCAT tractor matrix, thus making 14-15 years the recommended ages to begin tractor operations; 2) updating the adult responsibilities, recommended supervision, and age recommendations for 22 NAGCAT guidelines that involve tractor operations; and 3) developing a companion piece for parents outlining child development domains and their relationship to safe tractor operations. The updated tractor guidelines and the child development companion piece for parents are now available at cultivatesafety.org. With this project, we used research results to update the content of these best practices guidelines that have demonstrated efficacy for injury prevention. Agricultural industry leaders can help facilitate a widespread dissemination of these updated voluntary youth tractor work guidelines.