Tulsa Zoo has held accreditation from the Association of Zoos and Aquariums without a single break since 1976, a run that reached 50 years this month. The zoo announced the milestone on October 21.
The starting date is the part worth pausing on. AZA accredited its first institution in 1974. Tulsa Zoo came through two years later, and the zoo says it was one of the first 11 institutions in the world to pass the process. Half a century on, it has never let the credential lapse.
“Achieving AZA accreditation for 50 continuous years is a testament to the Tulsa Zoo’s unwavering commitment to excellence,” said Joe Barkowski, Vice President of Animal Conservation and Science. “We are honored to be recognized among the nation’s leading zoos and aquariums and remain committed to our mission of Connecting, Caring, Advocating for Wildlife, People, and Wild Places.”
What does accreditation actually involve?
More than a certificate, and it is worth spelling out, because the word gets used loosely. An institution seeking AZA accreditation submits a lengthy written application, then opens every part of its operation to review: animal care and welfare, veterinary programs, conservation and education work, safety, staffing, finances and physical facilities. Inspectors then spend multiple days on site. After that, the institution appears at a hearing in front of AZA’s independent Accreditation Commission, a panel AZA describes as sixteen trained experts, which votes on the outcome.
What makes a 50-year run meaningful is that it does not end there. AZA requires the entire process to be repeated every five years, so continuous accreditation since 1976 means Tulsa has gone through the whole sequence roughly ten times, in front of a commission whose membership and standards have both changed considerably across that span. Accreditation can also be rescinded between cycles if standards slip.
By AZA’s own accounting, about 10 percent of the roughly 2,150 animal exhibitors licensed by the U.S. Department of Agriculture hold the designation. Tulsa Zoo notes that federal agencies including the USDA and the Occupational Safety and Health Administration treat AZA standards as a national benchmark for zoological institutions.
What has Tulsa been building in the meantime?
Quite a lot, lately. The first section of the zoo’s William S. Smith African Wilds opened in September 2026, giving guests a new route to the rhinos and giraffes, and the Mary K. and John T. Oxley Family Elephant Experience and Elephant Preserve has reshaped how the zoo houses elephants. An accreditation cycle lands in the middle of construction like that rather than after it, which is part of why the inspection runs for days.
Tulsa is not the only institution we have followed through this recently. Mystic Aquarium came through its own renewal earlier this month.
Details of the milestone come from Tulsa Zoo’s October 21 announcement. The description of the accreditation process and the five-year cycle comes from AZA.
Quick answers
- How long has Tulsa Zoo been AZA accredited?
Continuously since 1976, reaching 50 years in October 2026. The zoo says it was one of the first 11 institutions in the world to pass the process.
- How often does a zoo have to be re-accredited?
Every five years. AZA requires the entire accreditation process to be repeated, and accreditation can be rescinded between cycles if standards are not maintained.
- What does AZA accreditation involve?
A lengthy written application, a review covering animal care and welfare, veterinary programs, conservation and education work, safety, staffing, finances and facilities, a multi-day on-site inspection, and a hearing before AZA’s independent Accreditation Commission.
- How many animal exhibitors are AZA accredited?
By AZA’s accounting, about 10 percent of the roughly 2,150 animal exhibitors licensed by the U.S. Department of Agriculture hold the designation.
- When did AZA start accrediting zoos and aquariums?
AZA accredited its first institution in 1974. Tulsa Zoo was accredited two years later, in 1976.
