Sonoma 100 Mile Sufferfest 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 20 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 - Sonoma 100 Mile Sufferfest · 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 | Pritchett Peak Turnaroundkm 9.4 | Lake Sonoma Visitor Center Aidkm 18.8 | Island View Aidkm 28.7 | Warm Springs Aidkm 40.7 | Wulflow Waterkm 49.5 | Liberty Glen Aidkm 54.3 | Lone Rock Aidkm 61.5 | Falcon's Nest Waterkm 68.1 | Lone Rock Aidkm 74.7 | Lake Sonoma Visitor Center Aidkm 81.3 | Pritchett Peak Turnaroundkm 90.8 | Lake Sonoma Visitor Center Aidkm 100.1 | Island View Aidkm 110.1 | Warm Springs Aidkm 122.0 | Wulflow Waterkm 130.8 | Liberty Glen Aidkm 135.6 | Lone Rock Aidkm 142.8 | Falcon's Nest Waterkm 149.4 | Lone Rock Aidkm 156.0 | Lake Sonoma Visitor Center Aidkm 162.7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water | ✕ | ✕ | ✕ | ✕ | ✕ | ✕ | ✕ | ✕ | ✕ | ✕ | ✕ | ✕ | ✕ | ✕ | ✕ | ✕ | ✕ | ✕ | ✕ | ✕ |
| Brand products | unavailable | ✕ | ✕ | ✕ | unavailable | ✕ | ✕ | unavailable | ✕ | ✕ | unavailable | ✕ | ✕ | ✕ | unavailable | ✕ | ✕ | unavailable | ✕ | ✕ |
Elevation profile
The course and its aid stations
Sonoma 100 Mile Sufferfest: 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 34h07 to 21h23, and the aid-station stop budget from 2h49 to 0h52. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.
| UTMB® Index | Estimated time | Of which stops | Night hours | Carbs | Fluid | Sodium |
|---|---|---|---|---|---|---|
| 500 | 34h07 | 2h49 | 12 | 2,047 g | 23.9 L | 17,060 mg |
| 550 | 32h02 | 2h14 | 12 | 1,922 g | 22.4 L | 16,014 mg |
| 600 | 29h15 | 1h45 | 12 | 1,755 g | 20.5 L | 14,629 mg |
| 650 | 26h29 | 1h25 | 12 | 1,589 g | 18.5 L | 13,244 mg |
| 700 | 24h48 | 1h12 | 10.8 | 1,488 g | 17.4 L | 12,403 mg |
| 750 | 23h16 | 1h02 | 9.3 | 1,396 g | 16.3 L | 11,631 mg |
| 800 | 21h23 | 0h52 | 7.4 | 1,283 g | 15 L | 10,695 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
- mines of Spain 100 miler, October162 km · 3,983 m D+ · October 16, 2026
- Ghost Train119 km · 626 m D+ · October 17, 2026
- Uwharrie 100161 km · 4,758 m D+ · October 17, 2026
- Pocatello Round114 km · 5,412 m D+ · October 17, 2026
- Ghost Train 30hr - 100mi160 km · 996 m D+ · October 17, 2026
- No Business 100 Official Course (Counterclockwise)161 km · 4,830 m D+ · October 23, 2026
- Marysville to Elmwood162 km · 285 m D+ · October 23, 2026
- Rim to River 100163 km · 3,083 m D+ · October 24, 2026
- Island View 100154 km · 6,966 m D+ · October 24, 2026
Sources and method
- Time projection — les temps par cote sont repris des passages réels des coureurs de chaque tranche sur les éditions précédentes de cette course, arrêts aux ravitaillements compris. Aucune formule n'intervient tant que ces résultats existent.
- 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 — Sonoma 100 Mile Sufferfest
Weather for Sonoma 100 Mile Sufferfest
Section-by-section forecasts for Sonoma 100 Mile Sufferfest, calculated at the estimated passing time: feels-like temperature, rain or snow, wind and thunderstorms. Three models — AROME (Météo-France), ICON (DWD) and ECMWF IFS — served from the finest to the farthest-reaching.
Forecast, not guaranteed: in the mountains a model describes a grid of several hundred meters, not the slope you're on.
Données météo : Météo-France (AROME), DWD (ICON), ECMWF (IFS) — CC BY 4.0, via Open-Meteo
Frequently asked questions
How many checkpoints?
Sonoma 100 Mile Sufferfest has 20 checkpoints: 14 aid stations and 6 water points. Details are in the two tables above.
What's the longest segment without aid?
The one leading to Warm Springs Aid: 11.9 km and 455 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?
Sonoma 100 Mile Sufferfest is 163 km long with 7140 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 29h15 for Sonoma 100 Mile Sufferfest.
What's the weather forecast?
RAVIT publishes the weather for Sonoma 100 Mile Sufferfest section by section: feels-like temperature, rain or snow, wind and storms, at the estimated passage time. Forecasts come from AROME (Météo-France), ICON (DWD) and ECMWF IFS, refreshed several times a day.
Want to stack the odds in your favor for Sonoma 100 Mile Sufferfest?
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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