Road Half marathons in Hertfordshire
Find road half marathons in Hertfordshire in 2025/2026 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.
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- Sun 14 Dec
- £33-£35
ATW Stevenage Winter Half Marathon
Starting and finishing on the fantastic Ridlins Stadium athletics track, the route winds its way around the superb traffic-free tarmac routes that cover the town of Stevenage.
- Enter online
- Age 17 & over
- 13.1 miles road running + 285 ft ascent
- Sun 1 Feb 2026
- £34-£36
ATW Watford Half Marathon
This popular event has a strong history within the running community and has been taking place for over 40 years! Join a day of running, community spirit and exciting experiences.
- Chip timing
- Enter online
- Undulating
- Age 17 & over
- 13.1 miles road running + 751 ft ascent
- Sun 22 Mar 2026
- £34-£36
ATW Run Fest at Lee Valley | Half Marathon
Smash your personal best on a traffic-free, flat and fast course from the White Water Centre and into surrounding beautiful regional parkland with a custom-designed medal for finishers.
- Enter online
- Flat
- PB
- Traffic free
- Age 17 & over
- 13.1 miles road running + 79 ft ascent
- Mon 6 Apr 2026
- £32-£34
ATW Stevenage Spring Half Marathon
From the fantastic Ridlins Stadium athletics track, wind your way around superb traffic-free tarmac routes and enjoy the beautiful Fairlands Valley Park the return to a vibrant event village!
- Enter online
- Traffic free
- Age 17 & over
- 13.1 miles road running + 538 ft ascent
- Sun 14 Jun 2026
- £36-£38
ATW St Albans Half Marathon
A community focused event, ATW St Albans Half Marathon aims to raise money for local charities and organisations as well as put on a great day out for all the family, delivered by runners for runners.
- Chip timing
- Enter online
- Traffic free
- Age 17 & over
- 13.1 miles road running + 699 ft ascent
- Sun 4 Oct 2026
- £31-£33
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
- Sun 1 Mar 2026
Berkhamsted Half Marathon and 5 Mile Fun Run | Half Marathon
- 13.1 miles road running
- Sun 7 Jun 2026
Hitchin Hard Half Marathon, Tough Ten Miler and Fierce 5 Miler and Kids Fun Run | Hitchin Hard Half Marathon
- 13.1 miles road running