Hertfordshire Half Marathon & 10k

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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!

Hertfordshire Half Marathon & 10k

Sun 1st November 2026

Three women are running in a race on a road. The woman in the center, wearing a pink shirt and bib number 328, smiles with arms raised. Other runners can be seen in the background.

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)

Races

  • 10k

    £32.00

    Booking for more than 1?
  • Half Marathon

    £38.00

    Booking for more than 1?
  • Group Booking

    £182.00

Event Video

Reviews

  • 5
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  • 2
  • 1

4.5

11 reviews

MS
Matt

·a year ago

Very well organised. Clear signage. Great atmosphere. My first race and definitely not my last 🏃🥇
PB
Pedro

·a year ago

Existing the venue was a nightmare. Took me over one hour to leave the grounds. Very unorganised.
SC
Steven

·3 years ago

Nice place. Good organization and logistics. I enjoy the run.
MB
Mike

·3 years ago

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.
EB
Esther

·5 years ago

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 avatar
Sam

·5 years ago

Very well organised event. Great race and very enjoyable atmosphere. Very hilly but would highly recommend.
Tom avatar
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!!
SR
Siobhan

·5 years ago

Amazing event. This was my first half and although it was challenging I loved it. Very hilly but absolutely beautiful scenery. Well organised just wish it had been more supported.
DH
DAVID

·5 years ago

Up hill to the finish. Lot's of helpful volunteers on hand to help. A hard run with hills,and a nice one to the finish line. Water and snacks and t shirt,medal at the end. Bag drop/pick up very quick. Will be back next year.
MJ
M

·5 years ago

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!!
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Chris

·5 years ago

First go. This was my first half marathon, I think I could have picked a kinder course to start with, the final hill before the finish line was brutal! Saying that I enjoyed the run, I just wouldn’t recommend it as a first half marathon!! 😁
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Location

Knebworth House, Old Knebworth Lane, Knebworth, UK

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1 Nov 2026

£32.00 - £182.00