Though Starbucks has been selling its famous pumpkin spice lattes for weeks, fall wasn’t here — until now. The fall equinox, sometimes called the September equinox, is on Saturday, Sept. 22 this year and will mark the first day of fall for the Northern Hemisphere. Just in time for the foliage to appear, here’s everything you need to know about the first day of fall, what happens when the season changes and what kind of weather we can expect this year. When is the first day of fall? The first day of fall is on Saturday, Sept.