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Half marathons in West Sussex

Find half marathons in West Sussex in 2026/2027 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.

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Join over 1,200 runners and walkers to the Serpent Trail, a stunning route that weaves through the greensand hills, rivers, woodland, and lowland heath of the South Downs National Park.
  • Sat 18 Apr
  • FREE-£36
Midhurst, West Sussex, UK

Spring Trail Series | 12K

Join over 1,200 runners and walkers to the Serpent Trail, a stunning route that weaves through the greensand hills, rivers, woodland, and lowland heath of the South Downs National Park.

  • 12 km trail running + 130 m ascent
  • Enter online
  • Age 18 & over
Enjoy a fully closed road race, on flat coastal roads with a spectacular seafront finish. Chance to take home a PB along with the finishers' t-shirt and medal.
  • Sun 3 May
  • £36-£42
Worthing, West Sussex, UK

Worthing RUNFEST Half Marathon

Enjoy a fully closed road race, on flat coastal roads with a spectacular seafront finish. Chance to take home a PB along with the finishers' t-shirt and medal.

  • 13.1 miles road running + 37 m ascent
  • Chip timing
  • Enter online
  • Flat
  • PB
  • Traffic free
  • Age 17 & over
  • Sun 8 Mar
  • £43-£45
Steyning, West Sussex, UK

Steyning Stinger | Half Marathon

  • 21 km multi terrain running
  • Sun 29 Mar
  • £44-£46
Arundel, West Sussex, UK

Springtide Half Marathon

  • 13.5 miles trail running + 1175 ft ascent
  • Sun 3 May
  • £35
Lancing, West Sussex, UK

Three Forts Challenge | Half Marathon

  • 13.1 miles multi terrain running + 1455 ft ascent
  • Sun 10 May
  • £40-£42
Crawley, West Sussex, UK

Run Gatwick | Half Marathon

  • 13.1 miles road running
  • Sun 27 Sep
  • £8-£28.50
Horsham, West Sussex, UK

Run Barns Green

  • Fun run
  • 5K run
  • 10K run
  • Half marathon

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