This event has taken place

Congratulations to everyone who took part. We're waiting on information about the next edition of this event.

Did you race? Let the community know how you got on and leave a review.

Add a review

TMC Earth Day 5K at Biosphere 2

Oracle, Arizona

Oracle, Arizona

Sat 20th April 2024

2 races

Organiser's Description

Post-Race Update: Click here for the 2023 Race Report, with info on awards, results, and more.  Remaining 2023 shirts and medals have been brought to the Running Shop and are available for remainder pickup until May 15th.
Early Registration Open for 2024!  Early-bird registration is a mere $20 through June 2023!
Run the Desert . . . then visit a rain forest, view an ocean reef, and wander through savanna grass lands . . . all in one day!
Join us at the 2024 TMC Earth Day 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.  
The TMC Earth Day 5k is raising funds for the Ocean Reef research project, learning how to grow ocean reefs in a changing climate.  See details and donate here. 
Limited to 500 Registrants -- what you get:
Timed 5k with finishers videoAge group and overall awards courtesy of The Running ShopSouvenir race shirtFree entry to the world-famous Biosphere 2Snacks and drinksFood trucks with yummy post-race food for purchaseChildrens activitiesCOX Conserves special festivities plannedPlus: you can choose to purchase a souvenir Earth Day race medallion!
Click here for the Damion Alexander photos.  Click here for the video Damion put together. Click here for the KGUN Morning Blend pre-race interview about the TMC Earth Day 5k at the Biosphere 2.
Dont miss this chance to visit the earths entire ecosystem under one roof while celebrating Earth Day.
Bring the Kids! Strollers are allowed at this child-friendly event, with a free Kids Dash Kids Zone
Do Good! This inaugural event raises funds for the world-renowned Biosphere 2s Ocean Reef Lab. 
Terrain: mostly pavement, with a brief dirt section
Difficulty: hilly in sections
Weather: 50s - 70s
Differently Abled: Yes, be mindful of hills and dirt road
Pets Allowed: No
Want Training Advice? Contact RRCA-certified running coach Tia Accetta at 
Planned 2024 Schedule:
7:15-8:15 am Race day registration and packet pick up8:30 Start time for TMC Earth Day 5k Run/Walk9:30 Free Kids Dash9:45 or so: AwardsOngoing: All registrants can visit Biosphere 2 on their own -- no need for a formal tour!
All non-running guests can purchase Biosphere 2 admission for the discounted rate of $10 (before 8:30 am) and all children under 12 are free.
This event is a partnership between Run Tucson the Biosphere 2, the University of Arizona
Questions? Contact Race Director Randy Accetta at  


  • TMC Earth Day 5k Run/Walk

    Sat 20th April 2024

  • Children's 5k

    Sat 20th April 2024



Done this event?

First-hand event reviews from people who have been there, done that and got the breathable T-shirt, really help everyone choose their next event.

Add a review

Who's In

See who else did this event

Anabel Nevarez


Oracle, Arizona

More from

You might like