UK Ultra Dark Downs 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 4 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 - UK Ultra Dark Downs 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 | CP1 - Falmerkm 11.0 | CP2 - Saddlescombekm 26.6 | CP3 - Saddlescombekm 36.2 | CP4 - Ditchling Beaconkm 45.4 |
|---|---|---|---|---|
| Water | available | available | available | available |
| Brand products | available | available | available | available |
La feuille de ton assistance pour UK Ultra Dark Downs 50k · 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
UK Ultra Dark Downs 50k: 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 6h29 to 4h04, and the aid-station stop budget from 0h14 to 0h05. 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 | 6h29 | 0h14 | 4 | 389 g | 4.5 L | 3,241 mg |
| 550 | 5h56 | 0h12 | 3.4 | 356 g | 4.2 L | 2,969 mg |
| 600 | 5h25 | 0h09 | 2.9 | 325 g | 3.8 L | 2,708 mg |
| 650 | 5h01 | 0h08 | 2.5 | 301 g | 3.5 L | 2,505 mg |
| 700 | 4h39 | 0h07 | 2.2 | 279 g | 3.3 L | 2,327 mg |
| 750 | 4h22 | 0h06 | 1.9 | 262 g | 3.1 L | 2,180 mg |
| 800 | 4h04 | 0h05 | 1.6 | 244 g | 2.8 L | 2,034 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
- Arc of Attrition - Arc 100K83 km · 2,588 m D+ · January 23, 2027
- Arc of Attrition - Arc 50K49 km · 1,329 m D+ · January 24, 2027
- South Downs Way 50M79 km · 1,754 m D+ · April 10, 2027
- Granite Peaks Ultra 50k52 km · 3,896 m D+ · April 17, 2027
- Ultra-Trail Snowdonia - Eryri 80K79 km · 2,547 m D+ · May 14, 2027
- Eryri by UTMB® - Eryri 80K®79 km · 2,547 m D+ · May 14, 2027
- Eryri by UTMB® - Eryri 50K®58 km · 3,407 m D+ · May 15, 2027
- Ultra-Trail Snowdonia - Eryri 50K58 km · 3,407 m D+ · May 15, 2027
- Skyline Scotland by UTMB® - Tour of the Ben 50K®63 km · 1,953 m D+ · September 18, 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 — UK Ultra Dark Downs 50k
Weather for UK Ultra Dark Downs 50k
The weather for UK Ultra Dark Downs 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 UK Ultra Dark Downs 50k, hour by hour on the courseFrequently asked questions
How many checkpoints?
UK Ultra Dark Downs 50k has 5 checkpoints: 4 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 CP2 - Saddlescombe: 15.6 km and 357 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?
UK Ultra Dark Downs 50k is 52 km long with 1211 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 5h25 for UK Ultra Dark Downs 50k.
What's the weather forecast?
The weather for UK Ultra Dark Downs 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 UK Ultra Dark Downs 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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