Dunstable Downs Half Marathon

Dunstable Downs Half Marathon is a scenic trail race set in the National Trust’s Dunstable Downs estate. In its sixth edition (2026), the 21.2km course with about 450m of ascent mixes ridge views, fast descents and climbs. The route begins at the National Trust Countryside Centre, visits Tree Cathedral and Bison Hill, loops Kensworth Quarry, then out-and-back to Five Knoles before returning along the downs.

It’s fully marked with orange arrows, marshals at turns, and two aid stations. The event is a UTMB World Series Index Race, capped at 300 runners with a 4-hour time limit. Entry £35 (£33 UKA). Visit the organization's website for the most recent information.