Earth Day 5k at Biosphere 2
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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.
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