Zoo Atlanta is open all year long, closed only on Thanksgiving and Christmas. We have transitioned to a timed ticketing system to limit the number of guests inside the Zoo at any given time. Zoo Hours: Monday – Friday: 9 a.m. – 5 p.m. Last entry is 3:30 p.m. Weekends: 9 a.m. – 6 p.m. Last entry is 4:30 p.m.