Skip to main content

TMC Earth Day 5K at Biosphere 2

TMC Earth Day 5K at Biosphere 2

Oracle, AZ 85623 US

TMC Earth Day 5k Run/Walk

Start Time:
8:30am MST
End Time:
11:00am MST
Price:
$35.00 Race Fee + $3.10 SignUp Fee
Registration:
Price increases to $40.00 after January 31, 2026 at 11:59pm MST
Sign Up

Children's 5k

$10 price for children 14-and-under: includes race number, timing, and entry to Biosphere 2, but no t-shirt.
Open to ages 1 - 14.
Start Time:
8:30am MST
End Time:
11:00am MST
Registration Limit:
55 spots left.
Price:
$10.00 Race Fee + $1.60 SignUp Fee
Registration:
Registration ends April 18, 2026 at 8:59am MST
Sign Up

Run in 3 Fun Places 10% Discount

10% Discount Per Event

Includes 2 to 3 of the following races.

TMC Old Tucson Trail Run 8-Mile, 4 Mile, 1 Mile
Tucson, AZ 85735 US 02/22/2026
Pick
1
of the following events:
  • 4-Mile Trail Run — Feb 22, 2026 at 9:15am MST to 11:00am MST
  • 1 Mile Walk/Fun Run — Feb 22, 2026 at 9:15am MST to 11:00am MST
  • Kids Mile 14-and-under — Feb 22, 2026 at 9:15am MST to 10:30am MST
  • 8-Mile Trail Run — Feb 22, 2026 at 7:30am MST to 9:30am MST
TMC Earth Day 5K at Biosphere 2
Oracle, AZ 85623 US 04/18/2026
Pick
1
of the following events:
  • TMC Earth Day 5k Run/Walk — Apr 18, 2026 at 8:30am MST to 11:00am MST
  • Children's 5k — Apr 18, 2026 at 8:30am MST to 11:00am MST
Empire Ranch Trail Run
Sonoita, AZ 85637 US 01/24/2026
Pick
1
of the following events:
  • 10k Run — Jan 24, 2026 at 9:30am MST to 12:00pm MST
  • 1 Mile Walk/Run — Jan 24, 2026 at 9:40am MST to 11:00am MST
  • Children's Mile: 14-and-under — Jan 24, 2026 at 9:40am MST to 11:00am MST
  • 5k Run/Walk — Jan 24, 2026 at 9:35am MST to 11:00am MST
Sign Up

If you continue to use this site, you consent to use all cookies. We use cookies to offer you a better browsing experience. Read how we use cookies and how you can control them by visiting our Privacy Policy.

If you continue to use this site, you consent to use all cookies.