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In 2015, fall begins on September 23rd (at 08:20 UTC) for countries in the Northern Hemisphere (United States, Canada). Fall-Autumn Activities and Games. In 2015, fall begins on March 20th (22:45 UTC) for countries in the Southern Hemisphere (parts of South America, parts of Africa, Australia, and Antarctica).
Rating Newest Oldest. Best Answer: Officially, the third week of September when Fall starts all over the U.S at the autumnal equinox - this year it is September 22nd. And you can find this answer easily through many other methods, like simply googling when does fall start.. You'd be surprised how google search can answer questions.