Fall tours meet with more 12th graders, as well as some 11th and 10th graders. Recruitment in the fall is critical interaction with 12th grade students as they are making decisions about where they will apply for the following year. In spring, you are likely to meet more 11th graders and conduct yield (meetings with applicants and admitted students). Fall tour schedules tend to be a little more hectic, while we try to leave more free time in the evenings on spring tours for yield meetings.
Please note for Brazil: when visiting Brazil, spring is the best time to meet with 12th graders at the beginning of their senior year, due to the difference in academic calendar there.