Siskiyou Out Back 100k 2027
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 10 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 - Siskiyou Out Back 100k · 2027
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 | Time Warpkm 9.4 | Potlicker 1km 18.5 | Ricketty 1km 28.2 | Ricketty 2km 40.7 | Potlicker 2km 48.7 | Willamette 1km 58.8 | Siskiyou Gap 1km 65.5 | Jackson Gapkm 74.7 | Siskiyou Gap 2km 84.8 | Willamette 2km 91.6 |
|---|---|---|---|---|---|---|---|---|---|---|
| Water | available | available | available | available | available | available | available | available | available | available |
| Brand products | available | available | available | available | available | available | available | available | available | available |
La feuille de ton assistance pour Siskiyou Out Back 100k · 2027
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
Siskiyou Out Back 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 16h36 to 9h48, and the aid-station stop budget from 0h56 to 0h19. 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 450, the overall cut-off of 18h00 is no longer reachable at the estimated pace.
| UTMB® Index | Estimated time | Of which stops | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|---|
| 500 | 16h36 | 0h56 | 2.6 | 996 g | 11.6 L | 8,296 mg | +1h24 |
| 550 | 15h08 | 0h45 | 2 | 908 g | 10.6 L | 7,567 mg | +2h52 |
| 600 | 13h24 | 0h36 | 2 | 804 g | 9.4 L | 6,704 mg | +4h36 |
| 650 | 12h19 | 0h30 | 2 | 739 g | 8.6 L | 6,155 mg | +5h41 |
| 700 | 11h22 | 0h25 | 2 | 682 g | 8 L | 5,685 mg | +6h38 |
| 750 | 10h31 | 0h22 | 2 | 631 g | 7.4 L | 5,255 mg | +7h29 |
| 800 | 9h48 | 0h19 | 2 | 588 g | 6.9 L | 4,896 mg | +8h12 |
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.
In the 2027 ranking
Siskiyou Out Back 100k is 100 km and 3,277 m of elevation gain, that's 132 km-effort: category L, among 87 races in 2027. Its time limit of 18 h requires a minimum speed of 5.6 km/h: rank 71 out of 83 of the widest cut-off times in L.
L ultra-trails 2027: 115 to 154 km-effort
Similar effort in 2027
- Miwok 100k · 132 km-effort
- Waldo 100k · 132 km-effort
- Fjällmaraton 100k · 132 km-effort
Other trails worth preparing for
- Javelina Jundred 100 miler158 km · 1,688 m D+ · October 31, 2026
- Javelina 100k97 km · 1,053 m D+ · October 31, 2026
- Tunnel Hill 5081 km · 182 m D+ · November 7, 2026
- Mountain Masochist 100k101 km · 3,268 m D+ · November 7, 2026
- Mountain Masochist 5081 km · 2,311 m D+ · November 7, 2026
- 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
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 — Siskiyou Out Back 100k
Weather for Siskiyou Out Back 100k
The weather for Siskiyou Out Back 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 Siskiyou Out Back 100k, hour by hour on the courseFrequently asked questions
How many checkpoints?
Siskiyou Out Back 100k has 12 checkpoints: 10 aid stations and 2 checkpoints with undocumented contents. Details are in the two tables above.
What's the longest segment without aid?
The one leading to Ricketty 2: 12.5 km and 435 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?
Siskiyou Out Back 100k is 100 km long with 3277 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 13h24 for Siskiyou Out Back 100k.
What's the weather forecast?
The weather for Siskiyou Out Back 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 Siskiyou Out Back 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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