Course
Rolling 3.1-mile course starting on the Great Lawn at Biosphere 2, about 3,820 feet elevation. It begins on grass with a gravel stretch and a steep initial descent, passes the Biosphere 2 complex, then follows a historic dirt road section with mountain views before climbing back uphill to finish on the Great Lawn. Mostly pavement with a brief dirt section.
Key dates
- ·RegistrationNot open yet
- ★Race daySat 17 Apr 2027
About
Run Tucson hosts the TMC Earth Day 5k Run/Walk on the grounds of Biosphere 2, one of Arizona's most popular tourist destinations. The event combines Earth Day celebration with a scenic run through the historic research facility's campus.
Save TMC Earth Day 5k at Biosphere 2 to your season and RunCalendar reminds you the morning entries open and before they close. Free on iPhone, no account needed.
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Cottonwood Vintage Run
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Whiskey Basin Trail Runs
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A confirmed date shows its day; a provisional one shows only its month, because we won't claim a day we don't have. This page is rebuilt every night from the RunCalendar catalogue.