Biosphere 2 presents the EarthRun 5K

Sat April 18, 2020 Oracle, AZ 85623 US Directions

Biosphere2 EarthDay 5k

9:00AM MST - 8:00PM MST
Event Website

Additional event information can be found at

32540 S. Biosphere Road
Oracle, AZ US 85623

Well, we've held out as long as we could, but we're at the point where we have to formally postpone the Inaugural Biosphere 2 EarthRun 5k until sometime in the coming months. While we would love nothing more than to meet up at the world-famous Biosphere 2 and enjoy a run through the roads it is simply not possible. We have considered making this a Virtual Run, but we think it's best if we simply wait until there is a good time to meet together on the grounds of the Biosphere 2. As the University of Arizona's John Adams, the Deputy Director of the Biosphere 2, says, "Biosphere 2 remains very excited about our new partnership with Run Tucson and look forward to hosting the EarthRun at Biosphere 2 in the future. We appreciate your dedication, support and flexibility and wish everyone to stay healthy and safe at this challenging time."

On our end, we thank those of you have pitched in to raise funds for the Ocean Reef Lab -- we will make the donation to the UA Foundation and provide them with your contact information. You can still donate to the Ocean Reef Lab here and we will make sure the funds get sent to the Foundation. We are also grateful to our friends at Proper Villains who have been planning much of the EarthFest festivities. Danh and the team at Proper Villains had a great party planned -- we'll put it on hold and come back to it!  In almost 20 years of race directing, this is the first time we've ever had to postpone an event, so this is a new experience for us. We've been in touch with several of you already -- thank you for your kind words and your feedback. Finally, we've been working with our colleagues at the Road Runners Club of America on a overview document with general advice for the national running community. We've posted a version of the document here. OK -- if anyone has any questions about our plan for the postponement, please contact me directly and we'll get it squared away. 

Thank you. Randy Accetta


When was the last time you got to do something for the first time? Join us at the inaugural Biosphere 2 EarthRun 5k.  Walk or run the hidden backroads of 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.  All registrants receive these cool swag items:

  • souvenir race shirt
  • souvenir race pin
  • commemorative race medal
  • official finisher's time with IPICO timing
  • entry to beer garden highlighted by local breweries
  • free entry to the world-famous Biosphere 2
  • admission to Biosphere 2's EarthFest 2020 events

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, and our friends at Proper Villains.

Saturday, April 18th Planned Schedule:
7:00 - 7:45 Race day registration and packet pick up
8:00 Start time for EarthDay 5k Run/Walk
9:15 Free Kids Dash
9:30 Awards + beer garden opens
Ongoing Earth Day Festival, with farmer's market, exhibits. beer garden, and more. All registrants can visit Biosphere2 on their own -- no need for a formal tour!

Fees - includes race, souvenirs, and entry to Biosphere 2 & BioFest
$20 Through January 31
$25 Through February 20
$30 Through March 31
$40 April 1 onward

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  

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

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