Hertfordshire Half Marathon & 10K

The Hertfordshire Half Marathon & 10K starts and finishes at Knebworth House, a Grade II listed country house in Old Knebworth. It is an autumn road-running event featuring a half marathon and a 10K, utilizing chip timing and closed roads for the main race. The routes proceed through rolling rural roads surrounding Hertfordshire and Knebworth Park before returning to the house. The event supports Garden House Hospice Care, attracting runners aiming for a personal best as well as first-timers increasing their distance. Knebworth House contributes local character: its grounds feature gardens and parkland, and the estate has hosted major open-air concerts by acts including Oasis, Led Zeppelin, Robbie Williams, and Red Hot Chili Peppers.