Ready to race? Register directly on the official race website — opens in a new tab.
Register →Save this race to your wishlist, set a registration reminder, and build a full training plan on Trehko.
TMC Earth Day 5K at Biosphere 2 is a 5k running event held in Oracle, AZ on Apr 17, 2027. The course has a trail profile.
Trehko tracks registration status, entry fees, and deadlines for TMC Earth Day 5K at Biosphere 2 and thousands of other endurance races. Use the app to set a registration reminder and build a training plan tailored to race day.
Browse by discipline: