Mammoth Trail Fest

Event overview

Mammoth Trailfest takes place September 25-27, 2026 in Mammoth Lakes, California, at 10001 Minaret Rd. The event is a multi-day festival with races, live entertainment, talks, films, storytelling, community runs, and local food. Lodging discounts of about 20-30% are offered with preferred partners. Registration opens January 20, 2026.

Races and entry

• Mammoth Triple - Dragon's Back Ascent, 50K, 26K (Sept 25-27)
• Dragon's Back Ascent - mountain ascent to Mammoth Mountain summit (Sept 25)
• tenkay - evening trail run with glow elements (Sept 25)
• 50K - single loop around Mammoth Lakes, high elevation and vertical gain (Sept 26)
• Kid's 1K - children’s event starting and ending in Village Plaza (Sept 26)
• 26K - single loop with Mammoth Mountain summit (Sept 27)

Entry fees listed for early registration (prices valid until March 1): Mammoth Triple $400, Dragon's Back Ascent $95, tenkay $90, 50K $199, Kid's 1K $10, 26K $150. Entry includes event swag, unique finisher medal, post-race food and drink, chip timing with splits for 50K/26K, aid stations, bus transport for Dragon's Back Ascent, free town transit, and a three-day festival program.

Rules, awards, and policies

Participants must be at least 15 years old for the 50K, 26K, and Dragon's Back Ascent; those 15 to 17 require parental consent. Awards go to the top three female, male, and non-binary runners in each 10-year age group (15-19 through 70+). Prize pools: $9,000 for the 50K, $9,000 for the 26K, and $3,700 for Dragon's Back Ascent. The organizer may cancel or postpone for force majeure or permit revocation; refunds are not given for event cancellation. Withdrawal credit policy: 90 days prior - 75% credit, 30 days - 50% credit, 14 days - 25% credit, within 14 days - no credit. Visit the organization's website for the most recent information.