How far is the Chiltern Hills 100K?

The Chiltern Hills 100K is one distance: 100K (62.1 miles).

How much climbing is in the Chiltern Hills 100K?

The 100K has 1,691 m of ascent.

How hard is the Chiltern Hills 100K?

100K: Expert. TRP grades come from distance and climb measured off the course file, not from the organiser.

Is the Chiltern Hills 100K course marked?

Yes, the course is marked. Navigation skills are not required.

When is the next Chiltern Hills 100K?

Sat, 2 Oct 2027, 07:00. Entries open.

Runaway Racing Chiltern Hills 100K

Chesham, BuckinghamshireSat, 2 Oct 2027

A hundred kilometres around the Chiltern Hills from Chesham, on a single loop.

100K

62 miles

1,691 m ascent

17 m per km

chalkwoodlandMarked course

Nobody has reviewed this one yet

No reviews of the Chiltern Hills 100K, and nothing on what people wore. Both are things no organiser publishes and every runner wants before they enter — how it actually went, and what was on your feet.

Ran it? Write the first review

Running it soon? Connect Strava and we will ask you about it the day you finish, so you do not have to remember to come back.

The course

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EXPERT

TRP grade · E5·T2

What you’re in for

A single anticlockwise loop of the Chilterns from Chesham, 99.7km with 1,691m of climb on the GPX (the organiser says 1,800m and more): out through Hastoe to the Ashridge estate, Ivinghoe Beacon and Aldbury, Tring Park, Wendover, Coombe Hill, Whiteleaf, Bledlow Ridge, Hampden and Great Missenden, and back. Seven in the morning in early October with nineteen hours, so most of the field finishes in the dark. Six checkpoints at 14, 28, 41, 58, 75 and 88km. Marked with orange arrows and ribbon, but you carry the GPX and a printed map as well, plus a full kit list with head torch and leg cover.

Terrain and trail

Chiltern chalk and beech woods for a hundred kilometres: firm flinty bridleway on the ridges, rooty single-track through the woods, steep short climbs onto each scarp and greasy descents off them, and clay field path in the valleys that holds October mud. Marked. A trail shoe.

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How to enter

Sat, 2 Oct 2027 · Entries open

Enter on their website ↗

Entries are handled by Runaway Racing, not by us. We take nothing for sending you there.

Add to your calendar · with the start time

Common questions

: The Chiltern Hills 100K is one distance: 100K (62.1 miles).
: The 100K has 1,691 m of ascent.
: 100K: Expert. TRP grades come from distance and climb measured off the course file, not from the organiser.
: Yes, the course is marked. Navigation skills are not required.
: We don't hold a compulsory kit list for the Chiltern Hills 100K. Runaway Racing confirm mandatory kit in their race information, usually in the final instructions.
: We don't hold published time limits for the Chiltern Hills 100K. If Runaway Racing set cut-offs, they'll be in the race information.
: We don't hold a checkpoint list for the Chiltern Hills 100K. What's on the table varies a lot between races, so check the Runaway Racing race information rather than turning up expecting food.
: Not yet — we don't hold a course file for the Chiltern Hills 100K. Some organisers only send the GPX to entrants. If we get one, it goes up free, with no sign-up.
: Sat, 2 Oct 2027, 07:00. Entries open.