Zoo Atlanta’s Boo at the Zoo is Atlanta’s favorite fun family Halloween festival! During the last two weekends of October from 9 a.m. – 3 p.m., enjoy trick or treating, plenty of photo opportunities, themed entertainment and activities, costumed characters, and so much more. Costumes are welcome. Boo at the Zoo is about creating special memories with the family, not necessarily to bring home the biggest haul of candy. Come for the candy but stay for the fun! This event is rain-or-shine; however, some activities may be delayed or canceled due to rain.