Half marathons in Hertfordshire
Find 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.
Filter by date
Filter by place
Filter by category
MapEvent listings
Select an event for photos, video, route, location, reviews, entry fees and how to enter.
- 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
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
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
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
Moo-rathon, Calf and Hen K
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.
- Newcomers
- Dogs allowed at venue
- Event village
- Age 18 & over
- Multi-terrain run 2
- 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
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
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
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
- £27-£38
Cock-a-doodle Dawdle
Join like-minded runners doing different distances, starting from the base camp of Hyde Hall Farm and encompassing the beautiful grounds around it.
- Newcomers
- Dogs allowed at venue
- Event village
- Rural
- Age 14 & over
- 5K run
- 10K run
- Trail run
- Half marathon 2
- Marathon
- + 1 more race
- Sun 2 Nov
Hertfordshire Half Marathon and 10K | Half Marathon
- 13.1 miles road running + 218 m ascent
- Sun 1 Mar 2026
Berkhamsted Half Marathon and 5 Mile Fun Run | Half Marathon
- 13.1 miles road running
- Sat 28 Mar 2026
Run the Wild Half Marathon - Spring Edition
- 21.1 km trail running + 300 m ascent
- 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