Hertfordshire Half Marathon & 10k November 2025

Join us for the return of the Hertfordshire Half Marathon & 10k on Sunday 2nd November 2025!

This popular ROAD CLOSED half marathon starts and finishes in front of the iconic Knebworth House with the course taking participants around the beautiful surrounding rural roads.

Start Times: 

Half Marathon – 9:00am

10k – 9:30am

Brand New Medal To Be Revealed! (Previous design pictured)

Knebworth House is a grade II listed house set in acres of beautiful gardens and parkland. Knebworth House has welcomed many music artists for major open air concerts, including Robbie Williams, Oasis, Led Zepellin and Red Hot Chilli Peppers. The grounds are home to popular tourist attractions including an adventure playground and dinosaur trail.

Included in the entry is:

a unique themed medal,

chip timed results,

free official race photos,

refreshments

and much more!

We have been extensively researching into what runners consider important, and sustainability is fast becoming the most important area. Click HERE to see what RunThrough is doing for sustainability.

T-Shirts at events have been a hot topic mainly around them not being a high enough quality to wear on a regular basis. So we have decided to tackle this by offering a RunThrough Kit Technical T-Shirt with a retail value of £22 for £12  with the addition of the event logo printed on the chest.

We can do this with our partner RT Kit as part of a strategic decision to not only raise awareness about the quality of the product but also to counteract the increasing costs incurred in event production in the current climate.

ONCE YOU ENTER YOU WILL RECEIVE A CONFIRMATION EMAIL. MORE INFORMATION ABOUT YOUR RACE NUMBER WILL BE SENT CLOSER TO THE EVENT – ENJOY!