The New Yorker has had many lovely autumn covers; see them here.
The cynicism of advertisers! I grab autumn vintage posters whenever I see them on my internet travels, but it was only after noticing that I had identical images for Connecticut and Vermont that I did a bit of reverse image search googling and found the rest. I'm sure there's one for every state that markets itself on its autumnal vistas...
Rolling Out the Gold Carpet, by John Cuneo, for The New Yorker. See more covers!