Chiltern 50 Ultra Challenge.
The Chiltern 50 Ultra Challenge is a 50 km loop from Henley Showground up into the Chilterns and back. No single hill settles the day: eight climbs do, all of them before the 40 km mark. Prepare above all for legs that can still run the nearly flat closing stretch once the last of them is done.
Chiltern 50 Ultra Challenge 2027: Course, Elevation & Route Profile
Start and finish are at Henley Showground, which puts them at the low end of the loop. Nothing is given away: the first climb begins within a few hundred metres, and by about 6 km three steps have lifted you to nearly 200 m. After a descent comes the steepest ramp of the day at 9 km, under 500 m long but averaging almost 15 percent.
The core of the course starts at 12 km. A climb of just over a kilometre leads into another drop, and from 16 km the longest climb takes you 2.6 km up to the high point near 250 m. The course then stays restless while slowly giving up height, until the second big climb from 27 km returns you to around 230 m.
The organiser lays the loop through the Chilterns countryside and divides it into four sections with rest stops every 12.5 km, the bigger one at halfway. That is more than a convenience here, because barely a quarter of the route is flat. After a long gradual descent one last steep ramp waits at 39 km, then the course drops back to start height and the final seven-plus kilometres to Henley run almost level.
| Start | Length | Ø | Max. | Gain | Cat. |
|---|---|---|---|---|---|
| km 0.1 | 1.4 km | 4.7 % | 8.6 % | +66 m | — |
| km 2.3 | 0.8 km | 7.5 % | 15.6 % | +58 m | — |
| km 3.8 | 1.2 km | 4 % | 11.4 % | +47 m | — |
| km 8.7 | 0.5 km | 14.7 % | 27.1 % | +70 m | — |
| km 12.4 | 1.2 km | 6.5 % | 14.1 % | +76 m | — |
| km 16 | 2.6 km | 4.3 % | 10.3 % | +111 m | Cat. 4 |
| km 27.4 | 2.3 km | 4.7 % | 14.1 % | +106 m | Cat. 4 |
| km 38.6 | 0.8 km | 9.5 % | 13.2 % | +74 m | — |
Climb categories follow the road-cycling convention and rate the terrain itself (length and gradient) regardless of sport: Cat. 4 marks the easiest rated climbs, Cat. 1 the hardest, and HC (hors catégorie, “beyond categorization”) is reserved for the most brutal ascents. Short climbs below the Cat. 4 threshold stay unrated.
How to pace Chiltern 50 Ultra Challenge.
Start under control
There is no steady kilometre pace on this loop: a third of the route goes up and a third goes down. Run to effort, walk the two steep ramps at 9 km and 39 km briskly rather than forcing a run, and treat the four sections between the rest stops as separate stages. The first should feel easy, even though four climbs make it the densest.
Hold your rhythm
The challenge is decided between the halfway stop and 40 km. The second long climb begins about two kilometres after the bigger break, and anyone who hurries up it on stiff legs has nothing left for the last ramp. So leave the halfway stop planning to stay deliberately calm until the top of that climb.
Spend what is left
The biggest trap sits between 31 km and 38 km. The long gradual descent feels like recovery, which is exactly why it gets run too fast. Every metre gained there is paid for in the quads you need on the ramp at 39 km and above all on the flat closing kilometres, where this loop still has the most time to give.
Training plan for Chiltern 50 Ultra Challenge: 12-week build
Build the base
Expect roughly five and a half to eight hours, depending on how much you run and how long you stay at the rest stops. That makes it a long aerobic effort with recurring short spikes: even the longest climb lasts only about 15 to 20 minutes, but the changes keep coming. Your endurance has to carry the duration while your legs absorb a great many small climbs and descents.
Train race pace
The decisive part of the day is the final third, and your long sessions should mirror it. Put the climbing into the second half of the long run, finish it with a steep hill and then run another 30 to 40 minutes on flat ground. That rehearses the sequence of late ramp, descent and level finish that this loop depends on.
Rehearse the course
In a normal week that means long runs on rolling ground with around 15 to 20 metres of climbing per kilometre, plus quick downhill stretches at the end of a session, since the descents here cover as much of the route as the climbs. Brisk walking on short, very steep slopes belongs in the plan too, because two ramps of that kind are waiting.
Arrive fresh
Practise the stops as well: eat and drink to the rhythm of the 12.5 km sections, and get running again after a break before your legs seize up. With a late September date your longest runs fall in late summer; place the last of them about three weeks before the race.
Courses
Download the Chiltern 50 Ultra Challenge course as a GPX file for your watch or bike computer.
Let YOUB adapt your plan for Chiltern 50 Ultra Challenge dynamically
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Everything about Chiltern 50 Ultra Challenge.
How long is Chiltern 50 Ultra Challenge?
Chiltern 50 Ultra Challenge is 50 km long. That distance shapes how much aerobic endurance, pace durability, and race-specific work belong in the training plan.
How much elevation gain does Chiltern 50 Ultra Challenge have?
Chiltern 50 Ultra Challenge has around 871 m of elevation gain over 50 km. That affects pacing, muscular load, and preparation for late-race sections.
What is the route profile of Chiltern 50 Ultra Challenge?
Chiltern 50 Ultra Challenge is classified as Rolling, averaging 17.3 vertical metres per kilometre. 23% of the route is flat, 34% climbs moderately (2 to 6%) and 5% is steeper than 6%.
What climbs does Chiltern 50 Ultra Challenge have?
The hardest climb of Chiltern 50 Ultra Challenge starts at kilometre 16, runs for 2.6 km at an average of 4.3% and gains 111 metres. Cycling-convention rating: Cat. 4. 8 climbs are mapped in total.
Is Chiltern 50 Ultra Challenge a loop course?
Yes, Chiltern 50 Ultra Challenge is laid out as a loop: start and finish are in the same place.
Is there a GPX file for the Chiltern 50 Ultra Challenge course?
Yes. The Chiltern 50 Ultra Challenge course is on this page as a free GPX download — ready to import into Garmin, Wahoo, Komoot, Strava or any other app that reads GPX.
How should I prepare for Chiltern 50 Ultra Challenge?
Preparation for Chiltern 50 Ultra Challenge should account for 50 km, 871 m of elevation gain, current training load, and available training time. An adaptive plan helps place key sessions without ignoring recovery and real life.
What pacing strategy works for Chiltern 50 Ultra Challenge?
The pacing strategy for Chiltern 50 Ultra Challenge should reflect 50 km, 871 m of elevation gain, and your current fitness. Start controlled and keep margin for sections where the profile or fatigue makes target pace harder.
When does Chiltern 50 Ultra Challenge 2027 take place?
Chiltern 50 Ultra Challenge 2027 takes place on September 25, 2027.
Where does Chiltern 50 Ultra Challenge 2027 take place?
Chiltern 50 Ultra Challenge 2027 takes place in Henley-on-Thames, United Kingdom.
Which distances does Chiltern 50 Ultra Challenge offer?
Chiltern 50 Ultra Challenge offers 3 distances — Chiltern 50 km: 50 km; Chiltern 25 km: 25 km; Henley 10 km: 10 km.
How do I register for Chiltern 50 Ultra Challenge?
Registration runs through the organiser: ultrachallenge.com. YOUB shows you the course, elevation profile and training plan for your preparation.
