Free Admission First Tuesday from 9am to 5pm at Houston Zoo - see INFO below. The Houston Zoo is committed to being a leader in the global effort to save animals in the wild. We are home to over 6,000 permanent residents (our animals) for whom we provide the highest standard in animal care. Every time you visit the Zoo, you're helping us save animals in the wild. We support 49 wildlife conservation projects in 27 countries around the world. This free offer includes Zoo admission. Admission to Zoo Lights is not included. Carousel, giraffe feeding, and other attractions are available at regular price; they are not free. The Houston Zoo is located in Hermann Park, near the Texas Medical Center and the Museum District. Our Main Entrance is at 6200 Hermann Park Drive. More Info below.