April 21: Thanks for visiting!  Online registration has closed, but you can still register in person on Friday, April 22 or Saturday, April 23, paying by check or cash.  The fee is $40 and while all race weekend registrants will receive free entry to the Biosphere 2, all in-person registrants will only be able to receive a

You can read all the race-day details here.  Click here to view the KGUN Tucson Morning Blend interview about the April 23rd TMC Earth Day 5k at the Biosphere 2.  You can read all the race-day details here.

Click here for the April 12th email to all race participants with details on the TMC Earth Day 5k.

Click here for the recent Run Tucson newsletter, with training advice and more.

Check out this week’s email with information on our upcoming coaster medals.  Register here for the April 23 TMC Earth Day 5k at the Biosphere 2.  Register here for the 2022 Gabe Zimmerman Triple Crown three-race series, sponsored by Tucson Medical Center.  

Click here for the Run Tucson newsletter with TMC Earth Day 5k at the Biosphere 2 race schedule and runner profile of TMC’s Mary Mellady Upcoming Race Schedule, including April 23 TMC Earth Day 5k at the Biosphere 2. Runner Profile of Mary Mellady from TMC, a nutritionist, RRCA certified run coach, and all-round fitness