From community, for community - join the soiree!
join the waitlist! all waitlists were exhausted in 2024
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.
Lodging Discount
Save 20-30% on your stay when booking with our preferred lodging partners at Mammoth Mountain - visit our site > 2025 event > lodging discounts
Race briefing/athlete presentation/welcome party: 9.18.25, 5:00pm
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: 9.19.25, 9:00am, $80 until 3/31
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: 9.19.25, 6:45pm, $85 until 3/31
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: 9.20.25, 7:30am, $195 until 3/31
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 cuttoff
Kid's 1K: 9.20.25, 10:30am, FREE until 3/31/25
Free event for children that will start/end under the same arch all races use in the Village Plaza!
26K: 9.21.25, 9:00am, $145 until 3/31
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: 9.19-9.21.25, $360 until 3/31
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!
AWARDS
Top 3 female/male runners in each 10 year age group awarded unique gift. Age groups: 15-19, 20-29, 30-39, 40-49, 50-59, 60-69, 70+
Prize Money: $9,000 in the 26K, $9,000 in the 50K and $3,700 in Dragon's Back Ascent, breakdowns can be found on our website
Mammoth Triple: Unique custom awards for top 3 female/male overall
Cancellations/Refunds/Withdrawal:
trailfest. reserves the right to cancel or postpone mammoth trailfest. due to a force majeure event, including, but not limited to, acts of nature (e.g., storm, fire, smoke, earthquake, flood), acts of government, strike, lockout, civil disorder, war or commandeering by any agency of government, pandemics, epidemics, and quarantine restrictions, or other unsafe conditions, as solely determined by trailfest. Please be aware that wildfires are a serious risk in the area. Permits to hold the event are also subject to USFS and TOML approval and they have the right to revoke permits at any time. Secondary to fixed costs of organizing this event, refunds will not be given in the event of cancellation. Practical efforts to fairly resolve unforeseen cancellations will be made and the Fest portion will continue regardless of individual event cancellation. In the case of runner withdrawal prior to the event we will honor the following credit policy; 90 days prior to event: 75% credit towards following years event; 30 days prior to event: 50% credit towards following years event; 14 days prior to event: 25% credit towards following years event; <14 days prior to event: no credit given. credits are good for the following year event only and are non-transferrable
Participants must be 15 years of age or older for 50K, 26K, and Dragon's Back Ascent. Participants at least 15 years of age and less than 18 years of age must have parental consent to participate. Younger participants considered on individual basis and if accompanied by an adult.
For specifics on our pregnancy, non-binary, and transgender policies please refer to our website under FAQ
Event's current local time: 11:30 AM PT
