Firewater 100K 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 15 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 - Firewater 100K · 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 | Peterson Roadkm 7.8 | Lotterdalekm 15.8 | Sinking Creekkm 21.8 | Coytee (Bridge)km 29.0 | Glendalekm 36.6 | Antioch Churchkm 42.0 | Mizell Bluffkm 48.3 | Mizell Bluffkm 53.1 | Antioch Churchkm 58.0 | Glendalekm 63.4 | Coytee (Bridge)km 71.0 | Sinking Creekkm 78.1 | Lotterdalekm 84.2 | Peterson Roadkm 92.2 | Finishkm 96.9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water | available | available | available | available | available | available | available | available | available | available | available | available | available | available | available |
| Brand products | available | available | available | available | available | available | available | available | available | available | available | available | available | available | available |
La feuille de ton assistance pour Firewater 100K · 2026
Les règles d'assistance de cette course ne sont pas encore connues : tu marqueras tes rendez-vous toi-même.
Recto, verso et planche d'étiquettes, en PDF : l'exemple d'une coureuse de l'UTMB.
Elevation profile
The course and its aid stations
Firewater 100K: 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 13h10 to 7h46, and the aid-station stop budget from 0h45 to 0h15. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.
Source
Below a UTMB® Index of roughly 310, the overall cut-off of 18h45 is no longer reachable at the estimated pace.
| UTMB® Index | Estimated time | Of which stops | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|---|
| 500 | 13h10 | 0h45 | 0.2 | 790 g | 9.2 L | 6,582 mg | +5h35 |
| 550 | 11h59 | 0h36 | — | 719 g | 8.4 L | 5,992 mg | +6h46 |
| 600 | 10h51 | 0h29 | — | 651 g | 7.6 L | 5,423 mg | +7h54 |
| 650 | 9h46 | 0h24 | — | 586 g | 6.8 L | 4,883 mg | +8h59 |
| 700 | 9h01 | 0h20 | — | 541 g | 6.3 L | 4,506 mg | +9h44 |
| 750 | 8h18 | 0h17 | — | 498 g | 5.8 L | 4,154 mg | +10h27 |
| 800 | 7h46 | 0h15 | — | 466 g | 5.4 L | 3,882 mg | +10h59 |
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
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- Mountain Masochist 100k101 km · 3,268 m D+ · November 7, 2026
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- Looking Glass 100K98 km · 3,190 m D+ · November 14, 2026
- Pass Mountain 50 Mile81 km · 1,602 m D+ · November 14, 2026
- Jackson County Ultras100 km · 2,491 m D+ · December 5, 2026
- Devil Dog Ultra 100k100 km · 1,820 m D+ · December 5, 2026
- Spirit of Syllamo 100152 km · 5,023 m D+ · December 12, 2026
Firewater 100K over the years
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 — Firewater 100K
Weather for Firewater 100K
The weather for Firewater 100K 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 Firewater 100K, hour by hour on the courseFrequently asked questions
How many checkpoints?
Firewater 100K has 16 checkpoints: 15 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 Peterson Road: 8.0 km and 171 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?
Firewater 100K is 97 km long with 1314 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 10h51 for Firewater 100K.
What's the weather forecast?
The weather for Firewater 100K 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 Firewater 100K?
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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