I agree, I'm not sure how many good choices are out there for this one. I think it's easier to do Summer(we've done that topic before) and Winter. I love Fall and it's my second favorite time of the year after Summer but there's really not a ton of movies that epitomize the feeling of Fall.
Agree with the commentary on Rudy and other sports movies, they don't really feel like Fall. Similar with Halloween movies but I do think the original Halloween and Hocus Pocus evoke the Fall spirit for me at least