Take the Virtual “San Diego-Mammoth” Challenge by completing both virtual half marathons in the same calendar year – and earn an extra large spinner medal!

The landscapes of both races are on one side...and max elevations are on the other!


  • Prior to March 15, 2020: you can Register for both the Mammoth Half Marathon (June 28) and the San Diego Half Marathon (March 15) by selecting the “Take the Challenge” upgrade during registration.  If you are already registered and did not purchase “Take the Challenge”, please email us.

Note: Whether you purchase the Challenge upgrade during registration or register for each race separately, you will automatically be entered into the Challenge.

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