Half marathons in Hertfordshire
Find half marathons near me in Hertfordshire for 2025/2026 - search by date or place, display on a map or use the advanced search to find your perfect race.
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Click an event for full event details, location, route, sustainability, what's included and how to enter.
- Sun 28 Sep
- £35-£37
- Sun 28 Sep
- £35-£37
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
- Sat 1 Nov
- £33-£35
- Sat 1 Nov
- £33-£35
Catherine Wheel Canter | Half Marathon
Welcome to the Fireworks Festival of Running! Come and tackle the track to see whether you can complete a half marathon over multiple laps of the 400m circuit - and how fast you can do it.
- Chip timing
- Enter online
- Flat
- Traffic free
- Age 18 & over
- 13.1 miles track and field
- Sat 1 Nov
- £33-£35
- Sat 1 Nov
- £33-£35
Guy Fawkes Gallop | Half Marathon
Welcome to the Fireworks Festival of Running! Come and tackle the track to see whether you can complete a half marathon over multiple laps of the 400m circuit - and how fast you can do it.
- Chip timing
- Enter online
- Flat
- Traffic free
- Age 18 & over
- 13.1 miles track and field
- Sun 14 Dec
- £29-£31
- Sun 14 Dec
- £29-£31
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
- £31-£33
- Sun 1 Feb 2026
- £31-£33
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
- Sat 21 Mar 2026
- £27-£38
- Sat 21 Mar 2026
- £27-£38
Moo-rathon, Calf and Hen K | 6 Hour
Join like-minded runners doing different distances, starting from the base camp of Hyde Hall Farm and encompassing the beautiful grounds around it.
- Chip timing
- Enter online
- Undulating
- Traffic free
- Age 18 & over
- 6 hrs trail running + 164 ft ascent
- Sat 21 Mar 2026
- £27-£38
- Sat 21 Mar 2026
- £27-£38
Moo-rathon, Calf and Hen K | 4 Hour
Marathon, Half and 10K! Join like-minded runners doing different distances, starting from the base camp of Hyde Hall Farm and encompassing the beautiful grounds around it.
- Chip timing
- Enter online
- Undulating
- Traffic free
- Age 18 & over
- 4 hrs trail running + 164 ft ascent
- Sun 22 Mar 2026
- £32-£34
- Sun 22 Mar 2026
- £32-£34
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
- £30-£32
- Mon 6 Apr 2026
- £30-£32
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 + 285 ft ascent
- Sat 23 May 2026
- £33-£38
- Sat 23 May 2026
- £33-£38
Farmmageddon | Half Marathon
Can you survive Farmmageddon? A fantastic half marathon through the lovely grounds of Hyde Hall Farm as part of the Farmmageddon endurance weekend.
- Chip timing
- Enter online
- Traffic free
- Age 18 & over
- 13.1 miles trail running + 164 ft ascent
- Sun 14 Jun 2026
- £34-£36
- Sun 14 Jun 2026
- £34-£36
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
- Sat 27 Jun 2026
- £34-£36
- Sat 27 Jun 2026
- £34-£36
Cock-a-doodle Dawdle | Half Marathon
Join like-minded runners doing different distances, starting from the base camp of Hyde Hall Farm and encompassing the beautiful grounds around it over a lovely half marathon looped trail route.
- Enter online
- Age 18 & over
- 13.1 miles trail running + 164 ft ascent
- Sat 27 Jun 2026
- £36-£38
- Sat 27 Jun 2026
- £36-£38
Cock-a-doodle Dawdle | Heavy Half Marathon
Join like-minded runners doing different distances, starting from the base camp of Hyde Hall Farm and encompassing the beautiful grounds around it over a lovely half marathon-plus looped trail route.
- Enter online
- Undulating
- Age 18 & over
- 13.1 miles trail running + 164 ft ascent
- Sat 11 Oct
Run the Wild Half Marathon - Autumn Edition
- 21.1 km trail running + 300 m ascent