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Flat Half marathons in Hertfordshire

Find flat 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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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.
  • Sat 1 Nov
  • £33-£35
Ware, Hertfordshire, UK

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
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.
  • Sat 1 Nov
  • £33-£35
Ware, Hertfordshire, UK

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
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.
  • Sun 22 Mar 2026
  • £32-£34
Waltham Cross, Hertfordshire, UK

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

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