Last Day Of Summer 2024 Calendar. Check the calendar icon next to each class on your schedule in my asu for the prorated deadline dates. Find out the date, how long in days until and count down to till summer 2024 with a countdown clock.

The last day of summer is determined by the september or autumn equinox, which marks the first day of fall. June 21 is usually the summer solstice, but it can vary slightly depending on the year and time zone.