NEW RACE! Earth Run 5k at the Biosphere 2

Yippee! We’re comin’ back to the Biosphere 2 for Earth Day!
We at Run Tucson had so much fun at the Biosphere that we’re heading back to celebrate Earth Day, 2022.

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 from Roadrunner Race 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 10th Planned Schedule:
7:30-8:15 Race day registration and packet pick up
8:30 Start time for EarthDay 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.