Biosphere 2

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32540 S Biosphere Rd
Oracle, AZ 85623
Biosphere 2 is open for public tours every day of the year except Christmas Day and Thanksgiving Day. The tour is an interesting combination of history and current research. Comfortable walking shoes are recommended.

Reviews

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4.0309 reviews
Photo of Jamiee W.
Jamiee W.
11/22/2025

What a cool place! Learned loads about how scientists tried to replicate what the earth does so they could do different earth science tests in a controlled environment. Still so much testing and...

Photo of Emil C.
Emil C.
12/26/2025

I got to check this place out a little bit when I was out here for the Tucson Marathon. The race had used this venue and the surrounding roads as the starting area for the race. Its name is...

Photo of Chris H.
Chris H.
12/20/2025

I took a tour while I was vacationing in Tucson. The different greenhouse biomes were fascinating and really cool to see. The living quarters and expensive tour of the library, not so much. I...

Photo of Michael G.
Michael G.
3/27/2025

We have never met a museum that we didn't love and Biosphere 2 delivers. What a checkered history it has, and it is now owned and operated by U of Arizona. The tour is self guided with the app...

Photo of Brandon T.
Brandon T.
12/24/2025

Highly recommend visiting the Biosphere 2, this is such an incredible piece of science.

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