The Brdský půlmaraton is a Trail Running Cup race held in Kytín, a village in the Prague-West District of the Central Bohemian Region of the Czech Republic. It takes place in August and features two distances: a 9 km race named Desítka and a 21.1 km race named Půlmaraton.
Both races begin in Kytín, providing the event with a small-village atmosphere instead of a large-city feel. August weather is generally suitable for trail running, with mostly sunny days, average temperatures between 14°C and 25°C, and about 60 mm of average rainfall; the month is typically warmer and drier than July.