The Dirt Half Challenge is a Saturday trail half marathon held in Leighton Buzzard, Bedfordshire, using Cedars Upper School as the event venue. The race begins in the historic market town, offering participants a varied off-road course that includes park paths, canal towpath, countryside climbs, woodland, and the Greensand Ridge.
The route starts with an anti-clockwise circuit of Tiddenfoot Waterside Park. It then proceeds along the Grand Union Canal towpath north towards Stoke Hammond. From there, the course ascends towards Great Brickhill, passes through the woodland of Rushmere Country Park, and returns via the Greensand Ridge and canal towpath, concluding with a clockwise circuit of Tiddenfoot Waterside Park.