When Does Autumn End 2025. The first day of autumn is in 2025 on september 22 (according to the astronomical definition). What is the exact time of the start of fall in 2025?

Find out the date, how long in days until and count down to till autumn (or fall) with a countdown clock. March 20 (9:02 am) > june 21 (2:41 am) summer 2025: