Denver Zoo opened in 1896 in City Park with a single black bear cub, growing into one of the oldest zoological institutions in the western United States. Now operating as the Denver Zoo Conservation Alliance, it sits on an 80-acre campus and cares for more than 2,500 animals representing hundreds of species, from African lions to Humboldt penguins.
The zoo holds a distinctive place in American zoo history: its 1918 Bear Mountain exhibit is widely credited as the first naturalistic zoo enclosure in the United States, replacing barred cages with sculpted, moated habitats. That legacy of innovation continued through later additions like Predator Ridge, Tropical Discovery, and the Toyota Elephant Passage, making Denver Zoo a lasting fixture of Denver’s cultural landscape.
Stats at a Glance
- Location: City Park, Denver, Colorado
- Opened: 1896
- Size: 80 acres
- Animal count: 2,500+ animals
- Species: About 450 species
- Annual visitors: About 2 million
- Famous for: Bear Mountain, the first naturalistic zoo enclosure in the U.S. (built 1918)
A Legacy Built in City Park
Denver Zoo traces its roots to 1896, when a black bear cub was given to the city and housed in City Park, marking the start of what would become a major Rocky Mountain attraction. Over the following century, the zoo expanded steadily, adding exhibits that reflected changing ideas about animal welfare and habitat design, most notably the 1918 Bear Mountain, an early departure from cage-based zoo architecture.
Exhibits and Conservation Focus
Today’s Denver Zoo spans 80 acres and includes habitats such as Predator Ridge, Primate Panorama, Tropical Discovery, and the Toyota Elephant Passage, a $50 million exhibit that opened in 2012. In 2024, the organization rebranded as the Denver Zoo Conservation Alliance, underscoring its work on wildlife conservation projects across dozens of countries alongside its role as a family attraction in City Park.
Explore more: Explore more Zoos & Aquariums.
Denver Zoo FAQs
When did Denver Zoo open?
Denver Zoo opened in 1896 in City Park, Denver, starting with a single donated black bear.
How big is Denver Zoo?
Denver Zoo covers about 80 acres within City Park and is home to more than 2,500 animals.
Is Denver Zoo still called Denver Zoo?
The organization rebranded in 2024 as the Denver Zoo Conservation Alliance, though it is still commonly referred to as Denver Zoo.
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Photo: Donlammers / CC BY-SA 3.0, via Wikimedia Commons.