Hertfordshire Half Marathon 2026

The start line is positioned at historical Knebworth House for a dramatic effect, and the half marathon route explores the beautiful gardens of Knebworth Park before leading runners out to the surrounding countryside. 

The Hertfordshire Half Marathon is a closed road event which gives runners a rare opportunity to have the roads for themselves. This is unprecedented in this neighbourhood, so get out there and enjoy it.

Registration fee: £20
Fundraising pledge: £350

 

Supporting you as a Team Ambitious runner

As a part of Team Ambitious, you will receive: 

• an Ambitious about Autism technical running vest  
• supporter t-shirts for your squad  
• access to online training hub and dedicated Strava group  
• support from our dedicated Events team
• access to a range of digital resources to support your fundraising.
   

Contact the team

If you have any questions, please don't hesitate to contact the Events team by emailing events@ambitiousaboutautism.org.uk.