Chiltern Hills 100K

Chesham, United Kingdom • 9-10 May 2026

Chiltern Hills 100K

The Chiltern Hills 100K is a trail ultra marathon held in the Chiltern Hills on 9th May 2026. The race distance is 100K with 1800m+ of elevation. The event base is Chesham Guides Headquarters in Lowndes Park, Chesham, Buckinghamshire (HP5 1HX). The race is TRA licensed, holds a UTMB World Series index, and is limited to 250 runners. GPS tracking and chip timing with live results are used. The race has a time allowance of 18 hours and a minimum age of 20.

Route, checkpoints and requirements

The route is an anticlockwise loop starting and finishing in Chesham and passing landmarks such as the Ashridge Estate, The Ridgeway, Coombe Hill, Whiteleaf Hill, Bledlow Ridge and Great Hampden before returning via Great Missenden. The course is fully marked and runners must also carry a GPX route and a printed map.

There are six checkpoints with water and food, and many have toilets. Key aid locations include Hastoe (14K and 41.4K), Little Gaddesden (28K), Whiteleaf Hill (57.8K), Bledlow Ridge Village Hall (75.3K) and Little Hampden (88K). Required kit carried for the whole race includes a mobile phone with emergency number, route GPX, a refillable hydration system (0.5L min), waterproof or windproof jacket, head torch with spare battery, warm hat and gloves, basic first aid items, a reusable cup and a payment method. Entry fee is listed at £152 (£150 for affiliated runners). Visit the organization's website for the most recent information.

Race information

UTMB 100K
100 km
1800 m+
100k Ultra
Visit the organization's website for the most recent information.
Trail runs nearby

Run the Wild Half Marathon - Chiltern Hills The Run the Wild Half Marathon is a guided trail event based in the Chiltern Hills, starting from The Home Office in Tring. The route covers around 13 miles (about 21 km) with approximately 300 m..

Buckingham 10k is a charity running event in Buckingham Town Centre. The 10km multi-terrain route, organized by Run for the Sky, starts in the town centre and winds through Stowe Avenue, Stowe National Trust Gardens and farmland, offering a..

The Ridgeway Run is a challenging 15-kilometre (9.3 miles) trail race organized by Tring Running Club, featuring scenic routes mainly on footpaths and bridleways with stunning views of the Chilterns. The course starts near Tring, ascends th..

North Chilterns 50K - Event overview The North Chilterns 50K is a trail ultra held from Putteridge Bury Country House. The 4th edition takes place on Sunday 12th October 2025. The course distance is 50 km with approximately 798 m of elevati..

UTMB Index

Event The Frieth Hilly 5km and 10km is scheduled for 12 October 2025 at Frieth Primary School, Frieth Hill, Henley-on-Thames RG9 6PR. The courses run in the Chiltern Hills between Marlow and Henley-on-Thames, about 35 miles from central Lon..

Event details The Marlow Donkey is a walking and running challenge held on 12 October 2025 in Marlow, Bucks. The event base is Liston Hall (Marlow Community Association), Chapel Street, Marlow, SL7 1DD. It is organised by LDWA - Thames Vall..