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UK Triathlon Events Found

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Triathlons

Triathlons combine swimming, cycling and running into one of the most popular all-round physical challenges. There are a huge variety of types of triathlons to choose from in terms of distances, cycle and run terrain options, and whether the swim is in a pool, in open water (eg lake) or even the sea.

Triathlon distances:
Super Sprint Triathlons: 400m swim; 10km bike; 2.5km run.
Sprint Triathlons: 750m swim; 20km bike; 5km run.
Olympic Triathlons (aka Standard Triathlons): 1500m swim; 40km bike; 10km run.
Half Ironman Triathlons: 1.9km swim; 90km bike; 21.1km run. (This distance is also known as a “70.3” which refers to the total race distance in miles.)
Ironman™ Triathlons: 3.86km (2.4 mile) swim; 180.25km (112 mile) bike; 42.2km (26.2 mile) run. As Ironman™ is a trademark, these are also known as ‘Iron distance’ events.

Find a Race lists more than 450 triathlons every year. So whether you’re new to the sport and looking for your first Super Sprint triathlon or a hardened triathlete looking for a Double Ironman distance event, check out our comprehensive full 2025 - 2026 triathlon list below, or if you know which distance you want to search for use the links above.

Triathlons

🚀Boosted

Superfeet Sandman - Triathlon & Duathlon

Llanfairpwllgwyngyll, Gwynedd
21 Sep 25
£69.99 - £224.99
🚀Boosted

Dorney Lake Triathlon

Windsor, Berkshire
21 Sep 25
£62.00 - £97.00
4.4

THE ROC ENGLAND

Ulverston, Cumbria
06 Sep 25
£240.00

Triathlon Y Bala

Bala, Gwynedd
07 Sep 25
£80.99 - £105.99

ATW Grafham Triathlon

Grafham Water Visitor Centre, Marlow Park, Grafham, Huntingdon, Cambs, PE28 0BH
13 Sep 25
£82.68 - £127.20
4.7

Tri Reigate Sprint Triathlon

Betchworth, Surrey
13 Sep 25
£82.00 - £362.00

Woking Autumn Triathlon & Junior Aquathlon

Woking Leisure Centre, Woking Park, Kingfield Road, Woking, GU22 9BA
14 Sep 25
£20.00 - £74.50

Tri Reigate Standard Triathlon

Betchworth, Surrey
14 Sep 25
£92.00 - £407.00

The Brutal Triathlons & Seriously Brutal Duathlons

Llanberis
20 Sep 25 - 21 Sep 25
£70.00 - £355.00

ATW Big East & Maldon Triathlon

Promenade Park, Park Drive, Maldon, Essex, CM9 5JQ
21 Sep 25
£82.68 - £190.80
5.0

The One on the River - Henley

Henley-on-Thames, Oxfordshire
21 Sep 25
£25.00 - £110.00

Dorney Lake Triathlon

Windsor, Berkshire
21 Sep 25
£62.00 - £97.00
4.4

Dawlish Triathlon

Dawlish Warren
21 Sep 25
£47.70 - £59.36

Superfeet Sandman - Triathlon & Duathlon

Llanfairpwllgwyngyll, Gwynedd
21 Sep 25
£69.99 - £224.99

Dorney Triathlon

Windsor, Berkshire
27 Sep 25
£60.00 - £122.00
4.6

Hever Castle Triathlon & Multisport

Edenbridge, Kent
27 Sep 25 - 28 Sep 25
£35.00 - £245.00

East Leake 'End of Season' Sprint Triathlon

Loughborough, Leicestershire
28 Sep 25
£50.00 - £65.00

Warwickshire Triathlon 2025

Stratford-upon-Avon, Warwickshire
28 Sep 25
£89.00 - £99.00
5.0

SALCOMBE BREWERY CO SPRINT TRIATHLON

North Sands, Salcombe TQ8 8LD
28 Sep 25
£69.19
3.8

THE ROC SCOTLAND

Kinlochleven, Argyll
04 Oct 25
£240.00

Llandudno Triathlon & Duathlon

Llandudno, Gwynedd
04 Oct 25
£85.99 - £130.99

2025 Wilmslow Autumn Triathlon

Wilmslow, Cheshire East
05 Oct 25
£38.00 - £75.00

Torbay Triathlon Autumn

Torbay Velopark, Torbay Leisure Centre Penwill Way, Paignton TQ4 5JR
05 Oct 25
£26.50 - £54.06

Chirk Triathlon & Aquathlon

Wrexham, Chirk, Wrexham Principal Area
12 Apr 26
£30.00 - £57.00

Stratford Triathlon 2026

Stratford-upon-Avon, Warwickshire
19 Apr 26
£89.00 - £99.00
4.0

2026 Wilmslow Spring Triathlon

Wilmslow, Cheshire East
26 Apr 26
£37.99 - £75.00
5.0

Trident's Grantham Triathlon

Grantham Meres Leisure Centre, Trent Rd, Grantham NG31 7XQ
26 Apr 26
£58.97

Dorney Lake Triathlon - May

Windsor, Berkshire
02 May 26
£60.00 - £122.00
4.6

Cheshire Triathlon 2026

Nantwich, Cheshire East
10 May 26
£89.00 - £99.00
4.5

ATW Box End Triathlon

Box End Lakes,Box End Rd, Bedford MK43 8RN
24 May 26
£68.90 - £124.02

ATW Centurion 100KM Triathlon Box End

Box End Lakes,Box End Rd, Bedford MK43 8RN
24 May 26
£102.82 - £145.22

Marlow Triathlon

Marlow, Buckinghamshire
24 May 26
£72.00 - £152.00

Dorney Lake Evening Triathlon - May

Windsor, Berkshire
27 May 26
£60.00 - £80.00
5.0

Henley Triathlon 2026

Henley-on-Thames, Oxfordshire
31 May 26
£89.00 - £99.00
4.3

Dorney Lake Triathlon - June

Windsor, Berkshire
06 Jun 26
£60.00 - £122.00
4.6

ATW Grafman Middle Distance Triathlon

Grafham Water Visitor Centre, Marlow Park, Grafham, Huntingdon, Cambs, PE28 0BH
07 Jun 26
£148.40 - £190.80
5.0

Royal Windsor Triathlon

Windsor, Berkshire
14 Jun 26
£87.00 - £192.00

Staffordshire Endurance Festival

Walsall, West Midlands
14 Jun 26
£30.00 - £182.00

Bowood House Triathlon

Calne, Wiltshire
20 Jun 26
£37.00 - £77.00

Southend Triathlon

Car park area of Uncle Toms Cabin, Shoebury Common Road, Southend-on-Sea, SS3 9HG
21 Jun 26
£67.87 - £99.43

The Northumbrian Full & Half Iron-Distance Triathlon & Trails Runs

Hexham, Northumberland
28 Jun 26
£40.00 - £350.00
5.0

Dorney Lake Evening Triathlon - July

Windsor, Berkshire
01 Jul 26
£60.00 - £80.00
5.0
Showing 1-40 of 54 results
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