Experience Biosphere 2

When You Visit

What to Expect

The Biosphere 2 under-the-glass walking tour consists of:

  • 1 hour and 15-minute tour
  • Approximately 150 stairs, both up and down
  • Approximately 1-mile route to walk
  • 10-minute walk to and from the Visitor Center
  • On-your-feet, informational stops along the route
  • Opportunities to ask questions of expert staff
  • Indoor and outdoor

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 1 hour and 15 minutes, most of the time on your feet. The tour spends time outside as well as inside the Biosphere 2 research facility itself. Comfortable, closed-toed shoes are highly recommended as the tour route includes standing, climbing, and walking. 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.

Visits, including guided tours, are available on days with inclement weather unless conditions pose a hazard to the safety of visitors and staff. 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 ACCESSIBILITY. Self-guided exhibits and informational videos can occupy interested visitors for many hours. Visitors should plan to spend a minimum of 2 to 2.5 hours at Biosphere 2.

Tour Rules

To ensure the enjoyment and safety of visitors and to provide for the preservation of current research taking place at Biosphere 2 the following rules apply:


Tour sizes are limited and are filled on a first-come, first-serve basis. We accept reservations for behind-the-scenes, private, and school group tours. For the general tour, groups of 20 or fewer do not need to make reservations. For those who need to arrange for a less rigorous tour experience, please see our Accessibility page for more information on scheduling a modified tour.

​Walkers, Wheelchairs, Mobility Scooters, Strollers, and Child Carriers

Because of the number of stairs and steep terrain, wheelchairs, walkers, mobility scooters, and strollers are not permitted on the general tour route. 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.

Food & Beverage

Due to current, on-going research taking place inside Biosphere 2, food and beverages are prohibited on the under-the-glass tour. However, bottled water is encouraged. The Biosphere 2 Café offers a selection of lunch and snack items.

Cell Phones

In order to prevent disruption to other visitors, the use of cell phones is prohibited during tours. Cell phones may be used to take photographs on tour. The use of selfie sticks is prohibited.

Pets and Service Animals

Pets are not allowed inside Biosphere 2 or on the grounds, service animals that are trained to do a specific task are welcome. Do not leave pets unattended in vehicles.

Transportation Using Ride Sharing Services

Due to Biosphere 2's remote location it may be difficult to schedule a departing ride when using a ride sharing service.  We recommend that you make return transporation arragements prior to arriving at Biosphere 2.

Following these rules will ensure the maximum enjoyment and safety for all visitors. Prepare for your visit by reserving your tickets today.