Chiltern Challenge

Princes Risborough, United Kingdom • 19 Jul 2025

The Humanity Direct Chiltern Challenge is a one-day ultra running event held in the scenic Chiltern Hills, starting and finishing at Princes Risborough School in the South East of England. Participants can choose from three distances: 10km, 25km, or 50km, with ascent gains ranging from 258 to 871 meters. The course follows well-marked circular routes using National Trails and footpaths, featuring multiple checkpoints with food and water for longer distances. The event offers a supportive atmosphere with fully stocked aid stations, medical cover, free parking, transport from the train station, and refreshments at the finish. Entry fees support Humanity Direct, funding vital surgeries for children in developing countries. Visit the organization's website for the most recent information.

Race information

UTMB 50K
50 km
25 km
10 km
Visit the organization's website for the most recent information.
Trail runs nearby

Take on the Wendover Woods 50 on 15 Nov 2025, a 50 mile trail challenge near Aylesbury with about 10,000 ft of climb through beautiful forest terrain. Five 10 mile loops, supported aid stations and a 15 hour limit make for a tough but rewar..

UTMB Index

Join 5th Sundon Saunter on Sunday 16 November 2025, a friendly LDWA countryside challenge offering 13, 18 and 27 mile routes for walkers and runners. Enjoy undulating paths and checkpoint navigation; bring your printed route and basic kit.

The Rugged Radnage 10K Run, held in the Chiltern Hills near Radnage village, offers a challenging mixed-terrain course featuring roads, trails, footpaths, woods, and fields with notable ascents and descents. The event includes both 5K and 1..

Join the Smurf Run, a friendly 7 hour challenge along the Thames at Wraysbury. Finish 3 km to earn a Smurf themed medal and keep going to collect distance pins for half marathon, marathon and ultra achievements.