Mammoth Trailfest
Mammoth Lakes, CA
Sep 19–21, 2025
Overall Rating

- 50K, 26K, 2.75 Miler, Kids Run
- Trail (Unpaved)
- Official race website

From community, for community – join the soiree! We believe everyone should have room to experience the transformative power of trail running. Deep in California’s Eastern Sierra – home to Mammoth Lakes – you will find an inclusive large-scale event on breathtaking terrain. from world-class races and community focused events, … MORE
From community, for community – join the soiree!
We believe everyone should have room to experience the transformative power of trail running.
Deep in California’s Eastern Sierra – home to Mammoth Lakes – you will find an inclusive large-scale event on breathtaking terrain. from world-class races and community focused events, to free live entertainment, storytelling, and great local food, mammoth trailfest. is a multi-day experience designed to increase access to trail running through opportunity, education, and trail stewardship. it is an event built by our community, for our community, right in the heart of California.
On behalf of our small mountain collective in Mammoth, I welcome you and your family to mammoth trailfest. – whether racing, supporting, or spectating, enjoy this season’s end gathering of our community with inspiring stories, neighborhood grub, and miles along our favorite local trails before snow covers the Sierra. please join us. – tim + linds tollefson, head crafters at trailfest.
Entry includes: limited edition trailfest. swag; on course photo (tenkay individual photos not guaranteed); unique finishers medal; post race food and drink; professional live chip timing with on course splits (50K/26K); well stocked aid stations with generous cut-off times; goodies from partners; 3 day festival with activations, talks, and performances; community shakeout runs; fan zone with bells – while supplies last; post race party Sunday night; bus transport to start/from finish of Dragon’s Back Ascent; free town transit; additional perks/details will be announced.
Kick off the fest with a village welcome party! We will host a live race briefing, athlete presentation and social hour prior to the evening entertainment.
Dragon’s Back Ascent
Everyone is encouraged to kick off the weekend with a run, hike, or walk from Twin Lakes Bridge in Mammoth Lakes Basin at 8,500′ up the world famous and unbelievably beautiful Dragon’s Back Trail to the summit of Mammoth Mountain at over 11,000′. Party on the summit with doughnuts and music as the awards for Dragon’s Back Ascent are given during the Summit Ceremony. After a family photo enjoy a scenic gondola ride off the top of California. Spectators encouraged along the course and summit, BRING YOUR COWBELL! $3,700 Purse, 2.5hr cutoff
tenkay
GLOWSTICKS AND GOOD TIMES! DJ skizzlefresh will launch you from the village onto a lollipop trail of the cruisiest california carpet – shred beneath christmas lights, jefferey pines, and a fluorescent aid station before bombing back to the village party! custom medals, pizza, and best day brewing, 2hr 15min cutoff – HEADLAMPS REQUIRED
50K
Single loop course of Mammoth Lakes that starts/ends in the Village plaza designed for maximum beauty, experience, and challenge. With 7,000ft of vertical gain and an average elevation over 9,000ft, this is a true mountain running event that will leave you equally exhausted and inspired to return year after year. $9,000 Purse, 12hr cutoff
Kid’s 1K
Free event for children that will start/end under the same arch all races use in the Village Plaza!
26K
Single loop course perfect for testing your mountain legs or an elites’ finale after a long season of racing. Participants will start in the Village Plaza surrounded by fans and do a small but tough and technical loop of the region with a Mammoth Mountain summit before returning to the lively Village Plaza. $9,000 Purse! 7hr cutoff
Mammoth Triple
DBA, 50K, 26K. 3 days, 3 summits. No rest for the weary
Festival
See website for schedule of podcasts, talks, films, volunteering and partnering opportunities, travel, and more!
Mammoth Lakes
Home to just 8,000 permanent residents, Mammoth Lakes is a small ski town tucked high along the eastern flanks of California’s Sierra Nevada mountain range and surrounded by numerous Wilderness areas, National Forest land, and beneath 14,000ft peaks. This area is just north of Payahuunadü -Land of the Flowing Water- which has been cared for by Nüümü since time immemorial. It is a place you have to experience to still not fully believe exists. The jagged mountains breach straight up from the valley floor and tower over everything in sight including endless world-class singletrack trails. The enchantment and beauty of the Eastern Sierra often lure people in and they never leave. As visitors on this land we have a responsibility to be good stewards to the trails and Mammoth Trail Fest aims to educate our growing community on the importance of sustainable use and provide opportunities to give back to the area that grants us revelatory experiences.
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Recent reviews
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- Mammoth Trailfest
Trailfest triple
I ran the triple (DBA Friday, 50K Sat, 26K sun) What an epic event! It was amazing I highly recommend this event. Gorgeous views. It made me fall in love … MORE
I ran the triple (DBA Friday, 50K Sat, 26K sun)
What an epic event! It was amazing
I highly recommend this event. Gorgeous views. It made me fall in love with the eastern Sierras. I used this event as a last training block for my 100K and it was perfect for that! I will probably do this event again be wise it was so awesome.