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Mammoth Trailfest
Friday, September 25, 2026 · Mammoth Lakes, CA
Register for Mammoth Trailfest →on UltraSignup
The race in 60 seconds
It is one of 296 races on the California calendar that September. Unusually for a race, it falls on a Friday.
What race day usually feels like
Based on the last three years, race week in September typically sees lows near 40°F and highs around 68°F: classic PR weather if the wind behaves. Weather normals computed from Mammoth Lakes-area conditions for race week, not the nearest big city.
Common questions
When is Mammoth Trailfest?
Mammoth Trailfest is scheduled for Friday, September 25, 2026.
Where is Mammoth Trailfest held?
Mammoth Trailfest is held in Mammoth Lakes, California. It is about 76 miles from Fresno.
How do I register for Mammoth Trailfest?
Registration is handled on the official race page, linked at the top of this listing. Entry can close early if the race sells out.
More races nearby
- Oct 2, 2026THE MAMMOTHMammoth Lakes
- Sep 18, 2026Mammoth BUFF - Beer Mile RunMammoth Lakes · 1 Mile
- Jun 5, 2027Shadow of the Giants 50k & 20k RunFish Camp · 50K, 20K
- Sep 13, 2026Shaver Lake Mile High TriathlonShaver Lake · 14.7 Miles, 30.1 Miles, 11.6 Miles
See every race on the California calendar, California Ultras, or use the Race Finder for maps and filters.
Register for Mammoth Trailfest →on UltraSignup
Listing data refreshed nightly from the registration platform. Photos via Wikimedia Commons (CC BY 3.0). Last template review July 2026. Spot an error? Tell us and we'll fix it fast.