Use the code “RACESHED10” for $10 OFF registration!

The Mammoth Half Marathon is a premier race that celebrates the beauty and uniqueness of the Mammoth Lakes area, while raising money to help its communities.

The course carries runners over a breathtaking, scenic course through California’s picturesque High Sierra mountains and operates under permit on the Inyo National Forest. The route starts nearly 9,000 ft above sea level at Horseshoe Lake and finishes in downtown Mammoth Lakes (~7,800 ft). Since our inaugural race in 2013, we have added a scenic loop around Lake Mary and brand-new Waterford bridge, making our world-class course even better!

The Mammoth Half Marathon is a premier race event and the 2nd leg of the San Diego – Mammoth Challenge. The race is organized by the San Diego Half Marathon team. The San Diego Half Marathon is a nonprofit 501(c)(3). 100% of the net proceeds from the Mammoth Half Marathon & 5K event will go towards community service projects and select charitable causes in Mammoth Lakes. In addition to the funding, we hope to catalyze volunteerism as a way to help the communities throughout Mammoth Lakes. The Mammoth Half Marathon will also benefit additional
 charities by enabling runners to raise money for any or all of the select causes that are important to them.