When Is The First Day Of Fall 2024. The fall equinox officially begins at 8:44 a.m. In 2024, this happens on september 22, at 12:44 gmt (08:44 a.m.

In 2024, this happens on september 22, at 12:44 gmt (08:44 a.m. The fall equinox represents the official start of fall in.