9 a.m. – 7 p.m., Last entry 6 p.m.
The Houston Zoo is open seven days a week.
Friday, June 1, the Zoo will close early for a private event. Last entry at 3 p.m., and the Zoo closes at 4 p.m.
Thursday, June 21 and July 19, the Zoo will close early for After Dark: A Summer Series. Last entry at 4 p.m., gates close at 5 p.m.