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Hertfordshire Half Marathon

Run 13.1mi
Event details
  • (This event has been postponed until TBC)
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Race around the luxurious Knebworth House in the Hertfordshire Half Marathon. Great for runners of all stripes, the route starts at the stately home before taking you onto the surrounding country roads. Come for the beautiful rural setting or for your first half marathon.

Review summary

7 Reviews
  • Course
  • Organisation
  • Atmosphere


Sarah R
"How hilly it was! Though I still would have done it but I think it should state..."


cathy s
"A bit more information about the gradient and at which miles this applies..."


Dom G
"Knebworth House is a stunning setting for the race. On arrival the race village..."
See all reviews

Hertfordshire Half Marathon route

The Half Marathon starts and finishes at the 500 year-old Knebworth House which has, in more recent times, hosted an array of open-air concerts featuring the likes of Robbie Williams and Oasis.

The route will take you through the wide paths of Knebworth Park and along the surrounding rural roads which will be closed to traffic. Please note, there are number of gradients throughout the course.

The course will have marshals stationed at all crucial points during the race as well as clear distance marking.

Event Details

What’s Included
  • Finisher's Medal
  • Refreshments along the Course
  • Finisher's T-Shirt
  • Chip Timed Race
  • Marshalled course
Raceday Logistics


0900 - Half Marathon begins

Please arrive at least 45 minutes before the race to ensure you have ample time to complete the registration process. Further race day information will be sent out to those registered nearer the time.


This is a fantastic race for spectators who can station themselves at Knebworth House for the start and finish line.

Supporters can cheer on the athletes while also appreciating the 15th Century stately home in all its grandeur.


Volunteers are a focal point of all RunThrough events. As such they are always on the look out for more helping hands.

Duties generally vary but often include course marshalling, bag storage, and handing out finisher's medals. Volunteers are rewarded with one free entry into a RunThrough event.

If you're interested in signing up then follow the link here:

Frequently Asked Questions

Where are the refreshment stations?
There are three refreshment stations throughout the course at miles 3.5, 7.5 and 10. There is also an additional station for athletes as they cross the finish line.
Will there be storage facilities?
RunThrough offers a secure baggage facility. However, in the interest of space it is recommended that you bring as little extra baggage as possible.
Where can I see my race time?
Race results will be published on following the race's conclusion.

Hertfordshire Half Marathon weather forecast

Overcast throughout the day.

Predicted highs
Predicted lows
IconLight breeze possible, up to 7mph

Meet the organiser

RunThrough are a running community-based in London, inspired & led by a small passionate group of running geeks. We organize events all over the UK’s capital and the North West of England.



Hertfordshire Half Marathon reviews (7)

4.6 out of 5 stars

  • Course
  • Organisation
  • Atmosphere
  • Did the Half Marathon in 2019

    Thank you for organising the great event today. I feel so accomplished. The Finisher's medal, t-shirt and the post race snacks are lovely 🥰🥰🥰
  • G

    Grace M

    Did the Half Marathon in 2019

    I have just ran this half marathon for the first time and I loved it. I would highly recommend this run. It was hilly but as much as you went up you went down. The hill at the end was a challenge but a PB is still possible as I got an 8 minute one :-). Very well organised, great atmosphere, good for spectators. The only downer I can put on this event is the parking, lots of cars getting stuck in the mud including mine and very slow getting out.
  • Did the Half Marathon in 2019

    Knebworth House is a stunning setting for the race. On arrival the race village was busy for the warm-up session. The course took us on a couple laps of the estate before heading out to surrounding country lanes. It was a challenging course with plenty of hills, so hard to run a PB, but don’t let that put you off, a good turn out and supportive marshals and crowds made for a great event.
  • Did the Half Marathon in 2018

    Arrival was plain sailing, although leaving was busy. Men's urinals would be useful too, to reduce general toilet queueing. Challenging & rewarding course. Brutal final 1km, even if I had checked the gradient profiling. Good atmosphere, very scenic countryside, nice medal, awesome goodies for finishing. The 'village' was great, huge bonus of a free massage & enjoyed the music. Definitely a HM worth doing again, pb included! See you next year.
  • Did the Half Marathon in 2018

    A bit more information about the gradient and at which miles this applies too.Any toilets on the course.Allowing time to get out of Nebworth as took a long time due to single exit.
  • Did the Half Marathon in 2018

    How hilly it was! Though I still would have done it but I think it should state its undulating in the race description. I did however enjoy the race and managed a Pb, despite the hills!! There were unfortunately more unenthusiastic marshals that let down the enthusiastic ones! When youre running and knackered a boost from a Marshall seriously helps your motivation! Marshall @ mike 11 was great
  • Did the Half Marathon in 2018

    Hilly at times but the descents made up for it.
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