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TMC Earth Day 5K at Biosphere 2 Logo

TMC Earth Day 5K at Biosphere 2

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32540 S. Biosphere Road, Oracle AZ

Saturday, April 18th, 2026

TMC Earth Day 5K at Biosphere 2

Date: April 18, 2026

Location: 32540 S. Biosphere Road, Oracle, AZ

More information: Race Website

Event Overview

  • Celebrate Earth Day: Join us at Biosphere 2 for a 5k run and walk on the beautiful grounds.
  • Course Details: A scenic 3.1-mile course nestled at the base of the Catalina Mountains.
  • Post-Race Fun: Relax with music and food after the run.
  • Perfect for Everyone: Suitable for both seasoned athletes and those looking for a fun exercise experience.

Pricing

  • Entry Fee: $40 for the 5k includes race entry, souvenir shirt, and free entry to Biosphere 2.
  • Children's Pricing: $10 for children 14-and-under includes the 5k race and entry, but no souvenir shirt.

Biosphere 2 Tours

  • Living Laboratory: Explore diverse ecosystems and cutting-edge research facilities.
  • Free Entry: All registrants receive free entry to the informative tour.
  • Self-Guided Visits: Non-runners can purchase admission at a discounted rate of $10 before 8:30 am: kids under 12 are free.

Event Highlights

  • Souvenir Shirt: The first 750 registrants will receive a souvenir shirt.
  • Timed Race: Participants will receive a finisher's video.
  • Awards: Age group and overall awards distribution, courtesy of The Running Shop.
  • Post-Race Activities: Food trucks with delicious options and fun for kids.

Schedule

  • Thursday, April 16: Packet pickup and registration at The Running Shop from 4:00-6:00 pm.
  • Saturday, April 18: Race day registration from 7:15-8:15 am at Biosphere 2.
  • 8:30 AM: Start time for the TMC Earth Day 5k Run/Walk.
  • 10:00 AM: Awards ceremony and event wrap-up.

Additional Information

  • Kids Activities: Bring the kids! Special pricing for children and activities available.
  • Terrain: Mostly pavement with some hilly sections and a brief dirt path.
  • Weather: Expect temperatures in the 50's to 70's.
  • Assistance: Differently abled individuals are welcome, but be mindful of terrain challenges.

Contact & Support

  • Training Advice: Contact RRCA-certified running coach Tia Accetta at tia@runtucson.net.
  • Event Queries: Reach out to Race Director Randy Accetta at randy@runtucson.net.
  • Do Good: The event supports the Ocean Reef research project at Biosphere 2.
  • Pets: Sorry, pets are not allowed at the event.

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