Runaway Adventures - North Chilterns 50K
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North Chilterns 50K
The North Chilterns 50K is a trail ultramarathon held from Putteridge Bury in Luton. The next edition takes place on 21 November 2026. The course covers 50.3 km with approximately 725 m+ of elevation, is fully marked, and has a 9 hour overall time limit. The event is licensed by the Trail Running Association and held under UKA rules. It also carries UTMB World Series Index status. Maximum field size is 250 and minimum entry age is 20; dogs and pacers are not permitted.
The route follows the Chiltern Way to Lilley and continues across Warden Hill, Barton and Pegsdon Hills, passing through Pirton and Offley. There are four official checkpoints at 14.5 km (St Nicolas Church, Barton), 23.6 km (Pirton Village Hall), 35 km and 43.4 km (Offley Village Hall). Checkpoints provide water, Coke, a pre-mixed electrolyte drink, gels and chews, crisps, sweets and fresh fruit; sandwiches are available from CP2 onwards. The race organisers describe the course as varied trail terrain with some steeper climbs.
Crewing is permitted in the villages near the checkpoints but is not allowed at the checkpoint locations themselves; crew must not run alongside competitors. Runners must carry mandatory kit at all times, including a mobile phone, route map on a watch or phone, waterproof jacket, headtorch, at least 0.5 L refillable hydration, cash or card, warm hat and gloves, and a foil blanket. Entry benefits include chip timing, a finisher medal, on-route aid stations, medical support, bag drop and free onsite parking. Visit the organization's website for the most recent information.
