Experience Biosphere 2


Biosphere 2 is located north of Tucson, Arizona at the base of the stunning Santa Catalina Mountains. This one-of-a-kind facility sits on a ridge at a cool elevation of nearly 4,000 feet and is surrounded by a magnificent natural desert preserve. Come experience the remarkable Biosphere 2 which Time Life Books named one of the 50 Must-See Wonders of the World. See why visitors from around the globe journey here for this unique adventure not found anywhere else. Discover real-time research on the future of our planet as it unfolds in the world's largest earth science laboratory.

Biosphere 2 is open every day of the year except Thanksgiving and Christmas. We offer tours daily from 9:00 a.m. to 4:00 p.m. We ask that you arrive no later than 3:45 p.m. for the last tour of the day. It is not necessary to book a reservation for groups with 20 people or less. Upon arrival you will be assigned to the next available general tour. Pets are not allowed inside Biosphere 2 or on the grounds, service pets that are trained to do specific tasks are welcome.

The Biosphere 2 visitor center houses exhibits and multimedia displays along with a bookstore and cafe. Should you choose, your entry into Biosphere 2 is led by an interpretive specialist who takes you inside and under the glass. The beautiful trail system takes you on a once-in-a-lifetime tour that lets you smell our ocean and see a tropical rainforest up close. In addition to escorting you through the upper biomes, your interpretive specialist takes you through the basement technosphere and into one of the amazing lungs that helped moderate air pressure in Biosphere 2's once-sealed environment. Your tour will conclude in the underwater Ocean Viewing Gallery where you can explore the million-gallon ocean and its coral reef. Before or after your tour, take time to enjoy the many different programs or events that are offered throughout the season. The tour provides an opportunity to appreciate and discuss science in a friendly, informal setting. Your experience will be like no other!

The under-the-glass walking tour of Biosphere 2 consists of approximately 150 stairs (up and down) and the route is just under one mile to walk round-trip. The tour duration is one hour and 15 minutes with a considerable amount of standing. This includes ten minutes of travel to and from the Visitor Center. The tour includes time outdoors as well as inside the Biosphere 2 research facility. The weather can range from quite cold in the winter months to extremely warm during the summer months. Winter and spring weather can be unpredictable in Southern Arizona so wearing layers of clothing is recommended. Comfortable, closed-toed shoes are also highly recommended as the tour route includes standing, climbing and walking.

Unfortunately, due to low ceilings (in some areas) and doorways, babies and children can NOT be carried on an adult's back.  Front carrying and front slings are acceptable. Tours are conducted on days with inclement weather unless the weather conditions pose a hazard to the safety of the visitors and staff. The interior of the Biosphere 2 research facility is heated and cooled based on current research protocols and as a result visitors may experience a variety of heat and humidity conditions on the under-the-glass guided tour. Bottled water is allowed on the tour and encouraged. Visitors who have medical considerations, special needs, are non-ambulatory or have other conditions may want to arrange for a less rigorous tour, please see the Accessibility page.