The kids run. They start and finish under the same village arch as every other race here, with custom bibs and medals of their own.
Mammoth Trail Fest is a three day trail running festival in Mammoth Lakes, high in California's Eastern Sierra. The races that start and finish in the Village Plaza are a Friday night 10K run under headlamps, a 32 mile 50K on Saturday, a kids 1K, and a 16 mile 26K on Sunday. The 50K and the 26K are each a single loop with no reused trail, and both climb to the 11,053 foot summit of Mammoth Mountain before dropping back into town. The same weekend also holds the Dragon's Back Ascent, a 3 mile hill climb that starts at Twin Lakes and finishes on the summit. Around the racing there is free live entertainment, storytelling and local food in the Village, open to family, friends and fans.
The first Mammoth Trail Fest was run in September 2022. It was built by Tim and Linds Tollefson and the community they live in, and the 50K has grown every year since: 234 finishers in 2022, then 417, 540 and 637 through 2025. The race describes itself as a multi-day experience designed to increase access to trail running through opportunity, education, and trail stewardship.
14 people have been out there with a camera or a microphone.
+ 6 more.
These are other people's work and we link straight to them. Watching costs nothing and needs no account. More of them: every race we hold, on film.
Nobody sees it until we have read it. No account, no sign-in.
This changes nothing on the page on its own. Somebody checks it against the race first.
Somebody watches it before it goes anywhere near this page. What we are after is footage of this course, on the ground. If it would be just as true of any other race, it is not this.
We want the address of the file the race publishes, not the file. We download it from there so the page can say where the line came from.
We read every one of these and we write back. Every fact here carries the source it came from, and the way a wrong one gets fixed is a person checking it against what you tell us.
NavRun builds your pacing from your own training, then turns it into a plan your crew can follow: when to leave and where to park.
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