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Runners at the The One by the Canal — Half Marathon in Cowley to Watford, London
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Grand Union Canal Half Marathon

Date
Sunday 7 November 2027
Location
Cowley to Watford
Distances
Half Marathon
Entry From
£35

EVENT DETAILS

Run a scenic point-to-point Half Marathon from Cowley to Watford, following the Grand Union Canal through trails, woodland and waterside paths.

Take on a Half Marathon with a difference. The One by the Canal is a scenic point-to-point trail Half Marathon starting at Cowley Recreation Ground and finishing in Cassiobury Park, Watford. The route follows the Grand Union Canal north towards Watford, combining waterside running with country trails and woodland paths along the way. With a start in Cowley and a completely different finish line waiting for you in Watford, this isn't your typical city Half Marathon. It's a brilliant autumn challenge for runners looking to swap busy roads for trails, towpaths and the beautiful surroundings of the Grand Union Canal. A pre-race coach transfer is available from the finish in Watford to the start in Cowley, allowing you to park near the finish before being transported to the start line. Your entry includes chip timing, a finisher's medal, bag drop, race photography, water stations and medical support. One canal. One journey. One Half Marathon.

THE ROUTE

Get Directions Download GPX
21.1km
Course Distance
86 m
Elevation Gain
+−
Leaflet | © Esri, HERE, Garmin, FAO, NOAA, USGS

Elevation Profile

0k1k2.2k3k3.7k4.9k6.7k7.7k8.4k9.1k10.6k12.2k13.2k14k14.7k15.3k16.1k16.6k17k17.6k18k18.8k19.6k20.4k20.8k21.1k09182736

Cowley to Watford

WHAT'S INCLUDED

  • Chip timing
  • Finisher's medal
  • Race photography
  • Bag drop
  • Water stations
  • Medical support
  • Fully marked & marshalled route
  • Pre & post-race catering

GETTING THERE

This is a point-to-point Half Marathon with different start and finish locations. START Cowley Recreation Ground High Street Cowley UB8 2DZ What3Words: dock.method.chart FINISH Cassiobury Park Gade Avenue Watford WD18 7LG What3Words: palm.tribal.meals A pre-race coach transfer is available from the finish at Cassiobury Park to the start at Cowley Recreation Ground. If using the coach transfer, park near the finish in Watford before the event and take the pre-booked coach to the start. Your vehicle will then be waiting for you when you finish. Coach places must be booked in advance. There is no organiser-provided transport back to the start after the event.

PRE-RACE INFORMATION

Sunday 7 November 2027 · Cowley to Watford

Race number collection will take place at the Registration Tent in the start village at Cowley Recreation Ground. Participants should not expect to receive anything by post. The point-to-point course takes runners from Cowley to Watford, following the Grand Union Canal and incorporating country trails and woodland paths. The route will be clearly marked with signs and supported by event marshals. Water stations will be available along the route, with additional water available around the event village. A bag drop will be available for participants. Portable toilets will be available in the event village. There are no dedicated changing rooms or showers. Medical cover, catering and event photography will be provided. Confirmed start times, race number collection times, coach timings and detailed race-day information will be sent to registered participants ahead of the event.

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RegionLondon / Hertfordshire
StatusEntries Open
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