Hertfordshire Half Marathon & 10k
From RunThrough Events
- Date Sun 1st November 2026
- Time 09:00
- Location Knebworth, Hertfordshire
- Price £32.00 - £182.00
- Races 3 races
- Distances 10km, Half Marathon
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Event summary
Get ready for an exhilarating race experience at the Hertfordshire Half Marathon & 10K, organized by RunThrough Events! Mark your calendars for Sunday, 1st November 2026, as this vibrant event returns to the scenic backdrop of Knebworth, Hertfordshire. Runners of all abilities are invited to join in on the excitement, with both the Half Marathon (21.1 km) starting at 9:00 am and the 10K kicking off at 9:30 am.
Set against the stunning Hertfordshire countryside, participants will enjoy undulating road routes that promise to challenge and inspire. Whether you're aiming for a personal best or are a first-timer stepping up to the distance, the welcoming atmosphere and enthusiastic support from marshals will make this event unforgettable. Don’t miss your chance to be part of this autumn challenge! Secure your spot now at our Early Bird Prices and prepare for a day filled with fun, fitness, and community spirit!
Set against the stunning Hertfordshire countryside, participants will enjoy undulating road routes that promise to challenge and inspire. Whether you're aiming for a personal best or are a first-timer stepping up to the distance, the welcoming atmosphere and enthusiastic support from marshals will make this event unforgettable. Don’t miss your chance to be part of this autumn challenge! Secure your spot now at our Early Bird Prices and prepare for a day filled with fun, fitness, and community spirit!
Hertfordshire Half Marathon & 10k
Sun 1st November 2026
Organiser's Description
Join us for the Hertfordshire Half Marathon & 10K on Sunday 1st November 2026
The Hertfordshire Half Marathon & 10K 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. Whether you're tackling the Half Marathon or the 10K, you'll enjoy a welcoming race-day atmosphere, excellent support from marshals, and clear route markings. It's the perfect autumn challenge for seasoned runners aiming for a new PB or first-timers stepping up their distance.
Book your spot now at our Early Bird Prices!
Race Distances & Start Times
09:00 am - Half Marathon start
Distances: 21.1m
Cut-off: 3 Hours (12:00)
09: 30 am - 10k start
Elevation: 92m, Road (undulating)
Cut-off: 1.5 Hours (11:00)
The Hertfordshire Half Marathon & 10K 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. Whether you're tackling the Half Marathon or the 10K, you'll enjoy a welcoming race-day atmosphere, excellent support from marshals, and clear route markings. It's the perfect autumn challenge for seasoned runners aiming for a new PB or first-timers stepping up their distance.
Book your spot now at our Early Bird Prices!
Race Distances & Start Times
09:00 am - Half Marathon start
Distances: 21.1m
Cut-off: 3 Hours (12:00)
09: 30 am - 10k start
Elevation: 92m, Road (undulating)
Cut-off: 1.5 Hours (11:00)
Races
-
10k
£32.00
Booking for more than 1? -
Half Marathon
£38.00
Booking for more than 1? -
Group Booking
£182.00
Route and elevation
There will be mile markers, arrows and marshals along the course to keep you on track. There will be three water stations at miles 3.5, 7.5 & 10 as well as at the finish.
Reviews
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4.5
11 reviews
The run itself was great. A lovely scenic and smooth course I ran my quickest 10k for a few years.
However I was a bit frustrated to arrive at 9am for the 9:30 am start to find I could drive into the estate because the half marathon route meant the roads were closed. It meant a long walk in to the event village. Hundreds of people had a similar problem. If the instructions said I needed to arrive by say 8:45 to be able drive in then I would have.
Hilly. This one is in the grounds of Knebworth, you will be finishing outside the castle.
The route is a little hilly, you will be running in and out of the grounds.
Aim to be there earlier than a normal race due to the single track car entrance.
There is car parking on site, which is a field of long grass.
The goodie bag had to be THE best of all my half marathons, it included a large bag of bath salts, excellent!
Crowd support is really only at the end.
Sam
·5 years ago
Very well organised event. Great race and very enjoyable atmosphere. Very hilly but would highly recommend.
Tom
·5 years ago
Very well organised - but a bit hilly. Ran this yesterday - would do it again and most of it was fantastic - but the hill finish really made the finish line seem far away!!
Great first half marathon event. Had a really great time running my first half marathon. It was well organised with e-mails and race pack ahead of the day, all the event staff were friendly and cheerful and there were lots of food stalls etc. at the finish. I hope to do it again next year!
Congrats on your first half!!
Hertfordshire Half Marathon & 10k
