For many, the arrival of the Pumpkin Spice Latte at Starbucks marks the unofficial start of the fall season. Despite the beverage making its return earlier every year (and while summer is still going strong), it remains as popular as ever. With National Pumpkin Spice Day taking place on October 1, take a look at how the Pumpkin Spice Latte came to dominate this time of year in our slideshow.