Earth Day 5k at Biosphere 2
Race Information
Join Run Tucson at the Earth Day 5k and walk or run the hidden backroads of the world-famous Biosphere 2.
This landmark is nestled at the base of the majestic Catalina Mountains and is located north of Tucson. The rolling 3.1-mile course offers gorgeous desert and mountain views, and the race starts and finishes at the Biosphere 2 Lawn.
The race is capped at 1,000 registrants to ensure a unique race experience. All registrants receive cool swag items: souvenir race shirt; commemorative race medal; official finisher's time with chip timing; free entry to the world-famous Biosphere 2; and post-race snacks and goodies.
Participate in Running Research
Receive 2 FREE months of run training from our friends at RunDot
Participants receive 2 FREE months of run training.
The RunDot Project is a research initiative that helps RunDot quantify and enhance the performance gains that RunDot's Optimized Training delivers over training alternatives.
Learn more and apply using the button below.
Find Accommodation Near Earth Day 5k at Biosphere 2
Use this map to find hotels and airbnb accommodation near this race location.
Pace Calculator
Find your running pace and splits, and learn if you can outrun dangerous animals with the RunGuides run pace calculator.
Tell us your race tips
