Join us for the Hertfordshire Half Marathon & 10K on Sunday 1st November 2026 In Support of Garden House Hospice Care The Hertfordshire Half Marathon & 10K in support of Garden House Hospice returns for 2026, and registration is now OPEN! Taking place on Sunday 1st November, this exciting event is set in beautiful Old Knebworth, offering runners of all abilities a memorable race experience. Both races feature undulating, scenic road routes through the picturesque Hertfordshire countryside.
See it on the map, check who's going and RSVP — free on iPhone.
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