Mt. Tam 50k 2026
The forecast arrives five days before the start.
Here you'll find the elevation profile, an estimated finish time based on your UTMB Index and details of the 5 aid stations to plan your nutrition and hydration segment by segment.
What's your time based on your UTMB?
Times estimated by the RAVIT model, learned from real ultra-trail finish times. Enter your UTMB Index (utmb.world) to get a personalized estimate.
Cut-off times and crew - Mt. Tam 50k · 2026
Data from the official race rules, checked for every edition. The race rules prevail. Positions are interpolated along the GPX track and are a guide, not official course marking.
What you'll find at each aid station
| Product | Cardiac 1km 6.0 | Deer Parkkm 15.8 | Muir Beachkm 24.1 | Cardiac 2km 32.8 | Cardiac 3km 42.5 |
|---|---|---|---|---|---|
| Water | ✕ | ✕ | ✕ | ✕ | ✕ |
| Brand products | ✕ | ✕ | ✕ | ✕ | ✕ |
Elevation profile
The course and its aid stations
Other trails worth preparing for
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- Javelina Jackass 31k31 km · 322 m D+ · October 31, 2026
- Coldwater 50k52 km · 1,293 m D+ · November 1, 2026
- Lake Chabot 50K49 km · 1,896 m D+ · November 7, 2026
- Red Rock Canyon 50k49 km · 988 m D+ · November 14, 2026
- HOKA Pacific Trails California by UTMB - 50K®52 km · 1,548 m D+ · November 14, 2026
- VHTRC Redeye 50K50 km · 1,027 m D+ · December 30, 2026
Sources and method
- Time projection — times by index rest on a Riegel formula adjusted for elevation, calibrated on the previous edition's official results. Peter Riegel (Wikipedia)
- Trail nutrition — hourly targets for carbohydrate, fluid and sodium follow the commonly accepted ultra-endurance guidance. La Clinique du Coureur — Fuelling in trail running
- Course, aid stations and cut-offs — taken from the event's official rules, which prevail in case of any discrepancy. Official site — Mt. Tam 50k
Weather for Mt. Tam 50k
The weather for Mt. Tam 50k will appear here as soon as the forecast models reach that date, around five days before the start: feels-like temperature, rain, snow, wind and storms, section by section and at your passage time.
Detailed weather for Mt. Tam 50k, hour by hour on the courseFrequently asked questions
How many checkpoints?
Mt. Tam 50k has 6 checkpoints: 5 aid stations and 1 checkpoint with undocumented contents. Details are in the two tables above.
What's the longest segment without aid?
The one leading to Deer Park: 9.8 km and 328 m elevation gain. That's the one to load up for first.
How do I find the exact location of an aid station?
The Google Maps icon in the “Access” column opens the aid station's location: handy for planning your crew's routes.
What distance and elevation gain?
Mt. Tam 50k is 48 km long with 2005 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 6h37 for Mt. Tam 50k.
What's the weather forecast?
The weather for Mt. Tam 50k will be published on this page around five days before the start, once the forecast models reach the race date. It will be detailed section by section: feels-like temperature, rain, snow, wind and storms.
Want to stack the odds in your favor for Mt. Tam 50k?
In 2 minutes, RAVIT generates your complete plan: segment-by-segment time, carbs, water and sodium at every aid station, printable roadbook.
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