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 Road closed 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.

When you sign up for the Hertfordshire Half Marathon as part of #TeamDementiaCarers you’ll receive:

• A dedicated member of the fundraising team to support you from the start until the finish line and beyond
• Training plans
• A fundraising guide, as well as fundraising advice, hints and tips in the build up to the event
• Your very own branded Dementia Carers T-shirt or vest
• A range of fundraising materials (collection buckets, posters, balloons etc.) to make any events you hold look amazing

Kick-start your fundraising by setting up a JustGiving page. You can easily share your page with your friends, family and colleagues on social media and email to spread the word. Plus everything happens automatically – the money you donate is sent to us, Gift Aid collected, and your sponsors thanked. Job done!

By registering for this event, you’re agreeing to our terms and conditions. You can view the terms and conditions here.