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Earth Day 5K at Biosphere 2

April 23, 2022 @ 8:30 am - 11:00 am


Run the Desert . . . then visit a rain forest, view an ocean reef, and wander through savanna grass lands . . . all in one day!

Join Run Tucson 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. Don't miss this chance to visit the earth's entire ecosystem under one roof while celebrating Earth Day.

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.

Terrain: mostly pavement, with a brief dirt section

Difficulty: hilly in sections

Weather: 50's - 70's

Differently Abled: Yes, be mindful of hills and dirt road

Pets Allowed: No

Want Training Advice? Contact RRCA-certified running coach Tia Accetta at [email protected]

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 8:30am) and all children under 12 are free.


April 23, 2022
8:30 am - 11:00 am
Event Category:


Biosphere 2
32540 S Biosphere Rd
Oracle, AZ 85623 United States
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