1
Half marathons in Hertfordshire in September 2025
Find half marathons near me in Hertfordshire in September 2025 - filter by date or location, display on a map or use the advanced search to find your perfect race.
Filter by month
Filter by place
MapEvent listings
Select an event for photos, video, route, location, reviews, entry fees and how to enter.

- Sun 28 Sep
- £35-£37
- Sun 28 Sep
- £35-£37
Welwyn Garden City, Hertfordshire, UK
ATW Welwyn Half Marathon
The popular Welwyn Half Marathon starts and finishes on the impressive 400m athletics track at Gosling Sports Park with an ideal, traffic-free, disused railway line in between.
- Chip timing
- Enter online
- Traffic free
- Age 17 & over
- 13.1 miles road running + 400 ft ascent