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Half Marathons Found In Watford
View all ↓Half Marathons in Watford 2026 - 2027
The most comprehensive list of Half Marathons in and near Watford in 2026 - 2027. Find your perfect race!
If you've been putting in miles along the Grand Union Canal towpath or through Cassiobury Park, you'll know that Watford is flatter than most of Hertfordshire, and that makes a difference at the half marathon distance. Thirteen miles on forgiving ground is a different proposition to thirteen miles with hills in the way, and Watford gives you a fair shot at a time you'll actually be pleased with. It's one of the better spots in the region if a PB is what you're after. If you'd rather build up first, 10k runs in Watford are a good place to start.
Have a look and pick one that works with your training. When the half marathon feels comfortable and you want to know what 26.2 feels like, marathons in Watford are the next step up.
Looking for more options?
Explore half marathons across the East of England with half marathons near Basildon, half marathons in Bedford or half marathons in Cambridge.
Race Calendar: Half Marathons Found In Watford
🚀Boosted
Ouse Valley Way Marathon and Half Marathon 2026
St Neots, Cambridgeshire
Sun 20 Sep 26
£29.00 - £43.00
4.3
🚀Boosted
Hever Castle Run Series
Edenbridge, Kent
Sun 27 Sep 26
£28.22 - £52.41
4.2
On Sale
🚀Boosted
The Hurt
Guildford, Surrey
Sat 10 Oct 26
£31.00 - £35.00
🚀Boosted
Running Tribe Races
Course 1,2,3 are at - Chalfont Park Sports Club Chalfont Park, SL9 0QA. Course 4,5,6,12 are at - Chalfont St. Peter Community Centre , SL9 9QX. Course - 7,8 are at - Amersham Cricket Club, Missenden Rd, Old Amersham, Bucks, HP7 0RN Course - 9 is at - Sarratt Village Hall, The Green, Sarratt,,Nr Rickmansworth, Herts WD3 6AS Course - 10,11 are at - Chesham & District Community Association, White Hill Centre, White Hill, Chesham, Bucks, HP5 1AG.
Sun 25 Oct 26
£40.00
Run the Thames Bridges - half marathon
London
Fri 16 Feb 24 - Thu 31 Dec 26
£17.00 - £24.00
5.0
Run the Ghost Tubes - Half Marathon & 10K
London
Tue 01 Oct 24 - Thu 31 Dec 26
£14.00 - £17.00
4.3
Henry VIII's Wives Half Marathon
London
Sun 01 Feb 26 - Thu 31 Dec 26
£17.00
Wendover Woods Trail
Aylesbury, Buckinghamshire
Sat 22 Aug 26
£12.00 - £36.00
Surrey - Duck n Run - Rubber Ducky - Day 1
Walton-on-Thames, Surrey
Sat 22 Aug 26
£22.00 - £39.95
Surrey - Duck n Run - Rubber Ducky - Day 2
Walton-on-Thames, Surrey
Sun 23 Aug 26
£22.00 - £39.95
Surrey - Duck n Run - Rubber Ducky - Day 3
Walton-on-Thames, Surrey
Mon 24 Aug 26
£22.00 - £39.95
Surrey - Duck n Run - Rubber Ducky - Day 4
Walton-on-Thames, Surrey
Tue 25 Aug 26
£22.00 - £39.95
Surrey - Duck n Run - Rubber Ducky - Day 5
Walton-on-Thames, Surrey
Wed 26 Aug 26
£22.00 - £39.95
Surrey - Duck n Run - Rubber Ducky - Day 6
Walton-on-Thames, Surrey
Thu 27 Aug 26
£22.00 - £39.95
Surrey - Duck n Run - Rubber Ducky - Day 7
Walton-on-Thames, Surrey
Fri 28 Aug 26
£22.00 - £39.95
Surrey - Duck n Run - Rubber Ducky - Day 8
Walton-on-Thames, Surrey
Sat 29 Aug 26
£22.00 - £39.95
Dulwich Park 1 Mile, 5k, 10k & Half Marathon
London, Greater London
Sun 30 Aug 26
£30.00 - £32.00
5.0
Windsor Trail Run
Windsor, Berkshire
Sun 30 Aug 26
£37.00 - £44.00
Surrey - Duck n Run - Rubber Ducky - Day 9
Walton-on-Thames, Surrey
Sun 30 Aug 26
£22.00 - £39.95
Surrey - Duck n Run - Rubber Ducky - Day 10
Walton-on-Thames, Surrey
Mon 31 Aug 26
£22.00 - £39.95
Mystery Marathon & Half Marathon
Milton Keynes, Buckinghamshire
Thu 03 Sep 26
£29.99 - £34.99
ATW Bedford Running Festival
Russell Park, The Embankment, Bedford MK40 3RH
Sat 05 Sep 26 - Sun 06 Sep 26
£13.78 - £51.94
Henley River 10k, Half Marathon & Junior Race September 2026
Henley-on-Thames, Oxfordshire
Sat 05 Sep 26
£12.00 - £37.00
4.6
PHOENIX - Summer Marathon & Half Marathon
Walton-on-Thames, Surrey
Sat 05 Sep 26
£33.50
5.0
Richmond Park September 5k, 10k and Half Marathon
London, Greater London
Sun 06 Sep 26
£25.00 - £30.00
4.5
WIMBLEDON 10K & HALF MARATHON
London
Sun 06 Sep 26
£34.00 - £38.00
4.8
The Shere 42k, 21k & 10k Multi Terrain Event
Shere Recreation Ground, Upper Street, Shere, Surrey, GU5 9JF
Sat 12 Sep 26
£27.50 - £70.00
4.5
Flying Scotsman Marathons & Half Marathons
Milton Keynes, Buckinghamshire
Sat 12 Sep 26 - Sun 13 Sep 26
£34.99 - £41.99
The Rubber Ducky Waddle
The Last Hop, Unit 2, Thames Edge, 15-18 Clarence St, Staines TW18 4SU
Sun 13 Sep 26
£18.00 - £35.00
PHOENIX - Fluffy Phoenix
Walton-on-Thames, Surrey
Sun 13 Sep 26
£22.00 - £39.95
Midweek Chasing Numbers Sept 2026
The Last Hop, Unit 2, Thames Edge Court, Clarence Street, Staines, TW18 4SU
Fri 18 Sep 26
£18.00 - £27.00
5.0
Chas Avis Harvest Trail
Royston, Hertfordshire
Sun 20 Sep 26
£21.00
PHOENIX - Hedgie Hog Jog
Walton-on-Thames, Surrey
Sun 20 Sep 26
£22.00 - £40.00
Phoenix Crystal Palace - Retro Run
London
Sun 20 Sep 26
£22.00 - £39.95
Richmond Park Half Marathon
Richmond, Surrey
Sun 20 Sep 26
£40.00
4.4
Run Reigate Half Marathon, 10k, 5k & Kids Race
Reigate, Surrey
Sun 20 Sep 26
£19.00 - £42.00
4.0
PHOENIX - Cakeathon
Walton-on-Thames, Surrey
Sat 26 Sep 26
£22.00 - £40.00
Run Dorney Lake Marathon, Half Marathon, 10k & 5k - September
Dorney Lake, Court Lane, off Lake End Road, Windsor SL4 6FJ
Sat 26 Sep 26
£29.68 - £42.40
4.4
Battersea Park 5k, 10k & Half Marathon
London
Sat 26 Sep 26
£36.00 - £42.00
4.8
Clapham Common 5k, 10k & Half Marathon
London
Sun 27 Sep 26
£32.00 - £34.00
PHOENIX - Chocothon
Walton-on-Thames, Surrey
Sun 27 Sep 26
£22.00 - £40.00
Windsor Half Marathon 2026
Windsor, Windsor and Maidenhead
Sun 27 Sep 26
£44.00 - £48.00
4.8
Wizz Air Ealing Half Marathon 2026
London
Sun 27 Sep 26
£55.89 - £57.89
Midweek Chasing Numbers Oct 2026
The Last Hop, Unit 2, Thames Edge Court, Clarence Street, Staines, TW18 4SU
Fri 02 Oct 26
£18.00 - £27.00
Showing 1-40 of 187 results