Mammoth Trail Fest 26k 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 - Mammoth Trail Fest 26k · 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 | A1: Twin Lakeskm 6.0 | A2: Summitkm 12.3 | A3: McCoykm 17.9 | A4: Garagekm 22.6 | Finishkm 26.4 |
|---|---|---|---|---|---|
| Water | available | available | available | available | available |
| Brand products | available | available | available | available | available |
Elevation profile
The course and its aid stations
Mammoth Trail Fest 26k: times, aid-station stops and fuelling needs by UTMB® Index
Between a UTMB® Index of 500 and 800, the estimated finish time on this race runs from 3h32 to 2h23, and the aid-station stop budget from 0h05 to 0h02. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.
Source
| UTMB® Index | Estimated time | Of which stops | Night hours | Carbs | Fluid | Sodium |
|---|---|---|---|---|---|---|
| 500 | 3h32 | 0h05 | — | 212 g | 2.5 L | 1,766 mg |
| 550 | 3h17 | 0h04 | — | 197 g | 2.3 L | 1,638 mg |
| 600 | 2h59 | 0h03 | — | 179 g | 2.1 L | 1,491 mg |
| 650 | 2h48 | 0h03 | — | 168 g | 2 L | 1,401 mg |
| 700 | 2h40 | 0h02 | — | 160 g | 1.9 L | 1,329 mg |
| 750 | 2h32 | 0h02 | — | 152 g | 1.8 L | 1,267 mg |
| 800 | 2h23 | 0h02 | — | 143 g | 1.7 L | 1,188 mg |
Figures based on 60 g of carbohydrate, 700 mL of fluid and 500 mg of sodium per hour, "average" preparation and mild conditions (15–25 °C). Above 25 °C, count on roughly 900 mL/h and 700 mg/h. Carbohydrate intake is trained: 60 g/h is a floor, 90 g/h assumes a glucose-fructose blend and a gut used to it.
Other trails worth preparing for
- Fort Collins - Half Marathon22 km · 460 m D+ · October 18, 2026
- Javelina Jackass 31k31 km · 322 m D+ · October 31, 2026
- Coldwater Trail 25k25 km · 619 m D+ · November 1, 2026
- Rim Rock Half21 km · 21 m D+ · November 1, 2026
- HOKA Pacific Trails California by UTMB - 25K®25 km · 667 m D+ · November 15, 2026
- FOURmidable 35k35 km · 1,122 m D+ · February 13, 2027
- Lost Lake 25K25 km · 954 m D+ · March 6, 2027
- Desert RATS Trail Running Festival - 21K21 km · 642 m D+ · April 11, 2027
- The Canyons Endurance Runs - 25K25 km · 810 m D+ · April 23, 2027
Sources and method
- Time projection — times by UTMB Index are taken from the actual splits of runners in each level band on previous editions of this race, aid station stops included. No formula is used as long as these results exist.
- 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 — Mammoth Trail Fest 26k
Weather for Mammoth Trail Fest 26k
The weather for Mammoth Trail Fest 26k 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 Mammoth Trail Fest 26k, hour by hour on the courseFrequently asked questions
How many checkpoints?
Mammoth Trail Fest 26k has 5 checkpoints: 5 aid stations. Details are in the two tables above.
What's the longest segment without aid?
The one leading to A2: Summit: 6.4 km and 808 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?
Mammoth Trail Fest 26k is 26 km long with 1200 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 2h59 for Mammoth Trail Fest 26k.
What's the weather forecast?
The weather for Mammoth Trail Fest 26k 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 Mammoth Trail Fest 26k?
In 2 minutes, RAVIT generates your complete plan: segment-by-segment time, carbs, water and sodium at every aid station, printable roadbook.
No card required · Instant results