In honor of what once was Oktoberfest’s Bier Run, we now host our own beer run to keep the party going. Participate in the run AND the ride to be entered into the BUFF Category for Mammoth TUFF. Scored as an Omnium on time.
Date
Friday, September 18, 2026
Time
3pm-4:15pm: Pick up bib and swag in The Village at Mammoth
4:30PM: Race begins
Race Entry Fee
$30
All participants will receive three beers/water for the run.
Distance
3 laps of Lincoln House building in the Village
Distance: 3 x 0.3 mile
Layout
Race brief @ 4:30pm
All runners start together @ 4:35
Format
Back by popular demand are 12-oz beers and traditional format of:
Drink 12oz beer, Run 0.3mi, Drink 12oz beer, Run 0.3mi, Drink 12oz beer, Run 0.3mi, Finish!
You must run all three laps and drink 3x12oz beers to get a finishing time within 25minutes of the timing start.
Sober? No problem! We will have 12-oz sparkling water cans available for you.
Awards
1st place, BUFFEST WOMAN & MAN, will each receive a special gift.
Finishing times will be calculated into the BUFF Category omnium for awards on Sunday, Sept 20th.
SHORTEST WAITLIST IN THE GAME
75% sold out in 15 minutes?! you guys :) join us! we hope to start 250 people and the waitlist is moving quick as spots open up. *you have the option to accept or decline your spot should you be offered one
The MAMMOTH operates on permitted area and uses authorized facilities located on the National Forest and under special use permission from the Forest Service
VOLUNTEER SIGNUP
If you'd like to volunteer with us this year please sign up via the green link above. We will send out instructions to select your specific spot later in the yearWe've got sweet perks like exclusive swag and race credits. Email us for inquiries about aid station captains or other in-depth roles / [email protected]
WELCOME HOME
The MAMMOTH was born out of a desire to showcase the remarkable beauty of the Eastern Sierra, increase local economic impact during shoulder season, and provide a peak life experience with the community and quality that you know and love from trailfest.in 2025 we had an incredible 74% finish rate despite multiple storms and over a foot of snow on the second summit. we are here for the cutoff chasers and course record breakers. when the time is right we would love the opportunity to host you - tim and team
Runners Manual
visit our website for full event details, required gear, policies, etc.Pricing: $1595 early bird through Feb 28th
Course Description
The Mammoth is an unreal footrace through the Eastern Sierra, starting and finishing in Mammoth Lakes, California. This breathtaking loop connects small mountain communities while circumnavigating a 760,000 year old caldera. Your route will take you along pristine alpine lakes, abandoned mines, golden fall foliage, and dense pine forests before heading into the remote beauty of the Glass Mountains. Fragrant sage fills the air as you climb through high desert terrain and rolling hills. You’ll traverse vast expanses of volcanic rock, our world’s largest continuous Jefferey pine forest, and the great Tufa towers of Mono Lake. The race is bookended with summits of Mammoth Mountain, offering unreal 360° views from 11,053 feet of your entire journey
Prize Money
as always, we offer prize money to our f/m podiums. $5,000: first place female and male$3,000: second place female and male$2,000: third place female and male
Schedule of Events
October 1st — Mandatory Race Check-in* 12-6pm check in, in the Village Plaza at Mammoth Lakes* Headshots for Spot Tracker, mandatory medical check in* Runner briefing at 5:30pmOctober 2nd — Race Start* 7:00-8:30am Mandatory Spot Tracker pickup and gear check. YOU CANNOT START THE RACE WITHOUT YOUR SPOT TRACKER.* 7-9am Coffee will be provided at the start line for all runners and crew* 9am race startOctober 4th – First Finishers ExpectedFollow along with the live tracker and race updates during the race to know what’s going on, and come out to the Village Plaza to cheer them in!October 5th - OA Podium Awards Ceremony11:00am start/finish line - celebrate the queens and kings of Mammoth!October 6th - Village CutoffJOIN US AS WE CHEER IN OUR FINAL FINISHERS! Cutoff is 9:00pm, 108 hours* Drop bags will be available for pickup in the Plaza on a rolling basis, as aid stations close. Any drop bags sent to the final few aid stations will not be returned until after those AS have closed, so please plan accordingly if you have to leave early.October 7 – 6pm* drop bags must be picked up by 6pm in the Village Plaza. All remaining drop bags will be donated.
Event Cancellation, Deferrals, Refunds
Mammoth Trailfest reserves the right to cancel or postpone THE MAMMOTH 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, LADWP, BLM, Mono County, Cal-trans, TOML and law enforcement agency 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. In the case of runner withdrawal prior to the event we will honor the following refund/credit policy, refunds will be less the ultrasignup feePrior to June 1: 75% refund or 100% deferral towards next year’s event and a guaranteed entry; June 1 to June 30: 50% refund or 75% deferral towards next year’s event and a guaranteed entry; July 1 to July 31: 25% refund or 50% deferral towards next year’s event and a guaranteed entry; After August 1 no refund or deferrals accepted*Withdrawal from ultrasignup will automatically apply deferral credit towards following year per policy stated above. *If requesting refund, please email [email protected] *deferrals are good for following year only and nontransferable
Project Mammoth
Event's current local time: 1:38 AM PT
Trailfest presented by CRAFT WAITLIST join the waitlist! if someone withdraws the next in line will be offered a spot - you will have the option to accept or decline.RESERVED SPOTS still available for para and elite athletes - please visit our website and submit the form, we will get back to you shortly. our 70+ category filled fast and have over 45 athletes ready o shred! From community, for community - join the soiree! we believe everyone should have room to experience the transformative power of trail runningdeep 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, we 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 Trailfestentry includes: limited edition Trailfest swag; 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 zones; 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 + Entry Discounts Save 20-30% on your stay when booking with our preferred lodging partners at Mammoth Mountain - visit our site
2026 trailfest. > lodging discountwe offer seeded entries for elites, adaptive athletes, and 70+AG - visit our site > the races > elite athlete, adaptive athletes, 70+ athletes respectively and fill out the form Race briefing/athlete presentation/welcome party: 9.24.26, 6:00pmKick off the fest with a village welcome party! We will host a live race briefing, athlete presentation and social hour prior to the evening entertainmentDragon's Back Ascent: 9.25.26, 9:00am, $95 until 3/1Everyone 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 cutoffTenkay: 9.25.26, 6:45pm, $90 until 3/1GLOWSTICKS AND GOOD TIMES! DJ 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 REQUIRED50K: 9.26.26, 7:30am, $199 until 3/1Single 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 cuttoffKid's 1K: 9.26.26, 9:30am, $10our kids K is the BEST EVENT. they start and finish under the same village arch as all other races - custom bibs and medals for each26K: 9.27.26, 8:00am, $150 until 3/1Single 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. $15,000 Purse! WORLD FIRST PARA PURSE. 7hr cutoffMammoth Triple: 9.25-9.27.26, $400 until 3/1DBA, 50K, 26K. 3 days, 3 summits. No rest for the wearyFestivalSee website for schedule of podcasts, talks, films, volunteering and partnering opportunities, travel, and more! AWARDS Top 3 female/male/non-binary/para 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: $15,000 in the 26K, $9,000 in the 50K and $3,700 in Dragon's Back Ascent, breakdowns can be found on our websiteMammoth Triple: Unique custom awards for top 3 female/male/non-binary overall Cancellations/Refunds/Withdrawal: Mammoth 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-transferrableParticipants 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: 1:33 AM PT