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Purchase a Mammoth Half Marathon entry on June 28, 2020 to take the San Diego-Mammoth Challenge. Enter your San Diego Half Marathon Bib # before ordering. “Take the Challenge”  is also available as an option within the San Diego Half Marathon registration process.

Post race shipping of your bib, shirt, medal, and qualifying legacy items to your address on file, US addresses only. Please allow 2 weeks for delivery.  Shirt sizes available:  Women’s: XS, SM, MED, L, XL; Unisex: SM, MED, L, XL, XXL.  Enter participant’s name or Bib # before ordering.

Please allow 2 weeks for delivery.  Shirt sizes available:  Women’s: XS, SM, MED, L, XL; Unisex: SM, MED, XL, XXL.  Enter quantity and size before ordering.

This option is available to those who have already registered for the 5K and wish to transfer to the Half Marathon race. Enter participant’s name or Bib #  and estimated finish time before ordering.

Upgrade to VIP. This option is available to those who have already purchased a 5K, Relay or Half Marathon registration. Enter participant’s name or Bib # before ordering.