The San Antonio Zoological Gardens and Aquarium is an Association of Zoos and Aquariums-accredited zoo in Midtown San Antonio, Texas, United States. The 35-acre zoo has a collection of over 3,500 animals representing 750 species. The zoo is open year round*. Visit our calendar for daily hours and events. *Operating hours are subject to change due to inclement weather or private events. Extended hours for special events.