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Earth Day 5K at Biosphere 2

Saturday April 23rd, 2022

Oracle, AZ

Official Website


When was the last time you got to do something for the first time, a second time?

Well, now's the time -- join us at the inaugural EarthRun 5k, where you can walk or run the hidden backroads of the world-famous Biosphere 2, nestled at the base of the majestic Catalina Mountains, north of Tucson. The rolling 3.1 mile course offers gorgeous desert and mountain views, with start and finish on the Biosphere 2 Lawn.  To ensure a unique experience, the race is capped at 1,000 registrants -- all registrants receive these cool swag items:

  • souvenir race shirt

  • commemorative race medal

  • official finisher's time with chip timing

  • free entry to the world-famous Biosphere 2

  • post-race snacks and goodies

Bring the Kids! Strollers are allowed at this child-friendly event, with a free Kid's Dash & Kid's Zone

Do Good! This inaugural event raises funds for the world-renowned Biosphere 2's Ocean Reef Lab. .

This event is a partnership between Run Tucson & the Biosphere 2, the University of Arizona

Saturday, April 23rd Planned Schedule:
7:30-8:15 Race day registration and packet pick up
8:30 Start time for Earth Day 5k Run/Walk
9:45 Free Kids Dash
10:15 Awards 
Ongoing Earth Day Festival. All registrants can visit Biosphere2 on their own -- no need for a formal tour!

All non-running guests can purchase Biosphere 2 admission for the discounted rate of $11 (before 8:30 am) and all children under 12 are free.

Questions? Contact Race Director Randy Accetta at [email protected].  

Wanna' get in shape for the event? Contact RRCA-certified running coach Tia Accetta at [email protected]

Race Distances

Price Register
Earth Day 5k Run/Walk $30.00 until Register »
Biosphere2 EarthDay 5k Click to Find Out Register »

Places to Stay

Get Directions

Start Location

32540 S. Biosphere Road, Oracle, AZ

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