Triathlons in UK in September 2025
Find triathlons near me in UK in September 2025 - search by date or place, display on a map or use the advanced search to find your perfect race.
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Click an event for full event details, location, route, sustainability, what's included and how to enter.
- Sat 6 Sep
- £240-£260
- Sat 6 Sep
- £240-£260
THE ROC ENGLAND
Face up to the mountain in one of Europe's most inspiring locations. From Windermere to Coniston to summit England's highest mountain, if you love a tough and rewarding challenge - you'll thrive.
- Recycling
- Plastic bottle free
- Music
- Chip timing
- Enter online
- Mountainous
- Event village
- Rural
- Mountains
- Sustainability policy
- Plastic-free event
- Age 18 & over
- 1.5 km lake swimming
- 92 km road cycling
- 18.5 km multi terrain running
- Sun 7 Sep
- £99-£120
- Sun 7 Sep
- £99-£120
Helvellyn Triathlon
A renowned, challenging and unique event where the toughness of the course is only matched by the stunning scenery of the Lake District National Park. Not just another race but highly demanding.
- Enter online
- Mountainous
- Age 17 & over
- 1.5 km lake swimming
- 59 km road cycling
- 15 km trail running
- Sat 13 Sep
- £78
- Sat 13 Sep
- £78
ATW Grafham Sprint Triathlon
Athletes of all levels are guaranteed to enjoy the Sprint Triathlon at this fantastic venue that has been used for award-winning triathlons, national championships and GB qualifier races!
- Chip timing
- Enter online
- Flat
- Age 15 & over
- 750 m lake swimming
- 17 km road cycling + 384 ft ascent
- 5 km road running + 33 ft ascent
- Sat 13 Sep
- £99-£120
- Sat 13 Sep
- £99-£120
ATW Grafham Standard Triathlon
Athletes of all levels are guaranteed to enjoy The Standard Triathlon at this fantastic venue that has been used for award-winning triathlons, national championships and GB qualifier races!
- Chip timing
- Enter online
- Age 17 & over
- 1500 m lake swimming
- 38 km road cycling + 748 ft ascent
- 10 km road running
- Sat 13 Sep
- £120-£130
- Sat 13 Sep
- £120-£130
Sundowner Triathlon | 70.3 Triathlon
Join us, UPrevail Events, in bringing back the Sundowner. An unforgettable triathlon event at Allerthorpe Lakeland Park in Yorkshire is back on the race calendar for 2025.
- Chip timing
- Enter online
- Flat
- Age 18 & over
- 1900 m lake swimming
- 90 km road cycling + 287 ft ascent
- 21 km trail running + 17 ft ascent
- Sat 13 Sep
- £45
- Sat 13 Sep
- £45
Sundowner Triathlon | Sprint Triathlon
Join us, UPrevail Events, in bringing back the Sundowner. An unforgettable triathlon event at Allerthorpe Lakeland Park in Yorkshire is back on the race calendar for 2025.
- Chip timing
- Enter online
- Flat
- Age 18 & over
- 750 m lake swimming
- 20 km road cycling + 88 ft ascent
- 5 km trail running + 0 ft ascent
- Sat 13 Sep
- £70-£88
- Sat 13 Sep
- £70-£88
Sundowner Triathlon | Olympic Triathlon
Join us, UPrevail Events, in bringing back the Sundowner. An unforgettable triathlon event at Allerthorpe Lakeland Park in Yorkshire is back on the race calendar for 2025.
- Chip timing
- Enter online
- Flat
- Age 18 & over
- 1500 km lake swimming
- 40 km road cycling + 146 ft ascent
- 10 km trail running
- Sun 14 Sep
- £49.50
- Sun 14 Sep
- £49.50
Woking Autumn Triathlon & Junior Aquathlon | Super Sprint Triathlon
Book Your Spot for the Woking Super Sprint Triathlon! Join one of the most popular triathlons in the area, where athletes return year after year!
- Enter online
- Flat
- Age 15 & over
- 200 m pool swimming
- 13.6 km road cycling + 128 ft ascent
- 3.3 km trail running + 49 ft ascent
- Sun 14 Sep
- £59.50-£74.50
- Sun 14 Sep
- £59.50-£74.50
Woking Autumn Triathlon & Junior Aquathlon | Sprint Triathlon
Book Your Spot for the Woking Sprint Triathlon! Join one of the most popular triathlons in the area, where athletes return year after year!
- Enter online
- Flat
- Age 15 & over
- 400 m pool swimming
- 20.6 km road cycling + 249 ft ascent
- 5 km trail running + 75 ft ascent
- Sun 14 Sep
- £83-£98
- Sun 14 Sep
- £83-£98
Aviemore Triathlon | Long Hard Durty
Join the Aviemore Triathlon in the beautiful Cairgorms and enjoy an open water swim in the cool, calm waters of Loch Morlich and enjoy mountain biking and running on the trails of Glenmore Forest.
- Chip timing
- Enter online
- Hilly
- Age 15 & over
- 1000 m lake swimming
- 18 km mountain biking
- 9 km trail running
- Sun 14 Sep
- £73-£88
- Sun 14 Sep
- £73-£88
Aviemore Triathlon | Short Fast Durty
Join the Aviemore Triathlon in the beautiful Cairgorms and enjoy an open water swim in the cool, calm waters of Loch Morlich and enjoy mountain biking and running on the trails of Glenmore Forest.
- Chip timing
- Enter online
- Age 15 & over
- 500 m lake swimming
- 12 km mountain biking
- 5 km trail running
- Sun 21 Sep
- £56
- Sun 21 Sep
- £56
Dawlish Triathlon | Sprint
Start with a sea swim then it’s onto the bikes for two laps of a relatively sheltered and flat bike circuit. Then take in the coast path for some stunning views as you approach the finish line.
- Chip timing
- Enter online
- Flat
- Age 15 & over
- 750 m sea swimming
- 24 km road cycling + 708 ft ascent
- 5 km road running + 116 ft ascent
- Sun 21 Sep
- £82-£97
- Sun 21 Sep
- £82-£97
Eton Dorney Standard Triathlon
The Olympic venue, Eton Dorney, offers pan-flat, traffic-free roads and a beautiful clear lake for Standard-distance triathletes to enjoy in an exclusive setting.
- Chip timing
- Enter online
- Flat
- Traffic free
- Age 17 & over
- 1.5 km lake swimming
- 40 km road cycling
- 10 km trail running
- Sun 21 Sep
- £45
- Sun 21 Sep
- £45
Dawlish Triathlon | Super Sprint
Start with a sea swim then it’s onto the bikes for two laps of a relatively sheltered and flat bike circuit. Then take in the coast path for some stunning views as you approach the finish line.
- Chip timing
- Enter online
- Flat
- Age 15 & over
- 300 m sea swimming
- 16 km road cycling + 472 ft ascent
- 5 km road running + 116 ft ascent
- Sun 21 Sep
- £72-£87
- Sun 21 Sep
- £72-£87
Eton Dorney Sprint Triathlon
The Olympic venue, Eton Dorney, offers pan-flat, traffic-free roads and a beautiful clear lake for Sprint triathletes to enjoy in an exclusive setting.
- Chip timing
- Enter online
- Flat
- Traffic free
- Age 15 & over
- 750 m lake swimming
- 20 km road cycling
- 5 km trail running
- Sun 21 Sep
- £62-£77
- Sun 21 Sep
- £62-£77
Eton Dorney Super Sprint Triathlon
The Olympic venue, Eton Dorney, offers pan-flat, traffic-free roads and a beautiful clear lake for Super Sprint triathletes to enjoy in an exclusive setting.
- Chip timing
- Enter online
- Flat
- PB
- Traffic free
- Age 15 & over
- 450 m lake swimming
- 10 km road cycling
- 2.5 km trail running
- Sun 21 Sep
- £99-£120
- Sun 21 Sep
- £99-£120
ATW Big East & Maldon Standard Triathlon
The Big East and Maldon Triathlon is brought to you by the largest triathlon organiser in the UK! A great experience featuring a tidal river swim.
- Enter online
- Undulating
- Age 17 & over
- 1500 m river swimming
- 40 km road cycling + 479 ft ascent
- 10 km trail running + 86 ft ascent
- Sun 21 Sep
- £160-£180
- Sun 21 Sep
- £160-£180
Big East Middle Distance Triathlon
The Big East and Maldon Triathlon is brought to you by the largest triathlon organiser in the UK! A great experience featuring a tidal river swim.
- Enter online
- Undulating
- Age 18 & over
- 1500 m river swimming
- 86 km road cycling + 1112 ft ascent
- 20 km trail running + 172 ft ascent
- Sun 21 Sep
- £78-£99
- Sun 21 Sep
- £78-£99
ATW Big East & Maldon Sprint Triathlon
The Big East and Maldon Triathlon is brought to you by the largest triathlon organiser in the UK! A great experience featuring a tidal river swim.
- Enter online
- Undulating
- Age 15 & over
- 750 m river swimming
- 25 km road cycling + 230 ft ascent
- 5 km trail running + 43 ft ascent
- Sat 27 Sep
- £35-£60
- Sat 27 Sep
- £35-£60
Hever Castle Triathlon and Multisport Festival | Triathlon 9-10 years
Get the family active in the award-winning castle grounds in a triathlon for all abilities - even beginners then celebrate with friends and family in the festival village.
- Chip timing
- Enter online
- Age 9-10
- 200 m lake swimming
- 4.2 km road cycling
- 1.3 km road running
- Sat 27 Sep
- £115-£155
- Sat 27 Sep
- £115-£155
Hever Castle | Sprint Plus Triathlon
Get active in the award-winning grounds and surrounding Kent countryside in the a Sprint Plus Triathlon! Recruit your friends and celebrate completing your challenge in the festival village.
- Chip timing
- Enter online
- Age 17 & over
- 800 m lake swimming
- 40 km road cycling
- 8 km road running
- Sat 27 Sep
- £100-£150
- Sat 27 Sep
- £100-£150
Hever Castle | Sprint Triathlon
Get active in the award-winning grounds and surrounding Kent countryside in a Sprint Triathlon! Recruit your friends and celebrate completing your challenge in the festival village.
- Chip timing
- Enter online
- Age 15 & over
- 750 m lake swimming
- 20 km road cycling + 819 ft ascent
- 5 km road running
- Sat 27 Sep
- £95-£145
- Sat 27 Sep
- £95-£145
Hever Castle | Super Sprint Triathlon
Get active in the award-winning grounds and surrounding Kent countryside in a Super Sprint Triathlon! Recruit your friends and celebrate completing your challenge in the festival village.
- Chip timing
- Enter online
- Age 15 & over
- 400 m lake swimming
- 20 km road cycling + 819 ft ascent
- 4 km road running + 114 ft ascent
- Sat 27 Sep
- £80-£120
- Sat 27 Sep
- £80-£120
Hever Castle | Starter Triathlon
Get active in the award-winning grounds and surrounding Kent countryside in a Starter Triathlon! Recruit your friends and celebrate completing your challenge in the festival village.
- Chip timing
- Enter online
- Age 15 & over
- 200 m lake swimming
- 14 km road cycling + 591 ft ascent
- 2.5 km road running + 69 ft ascent
- Sat 27 Sep
- £78-£99
- Sat 27 Sep
- £78-£99
Dorney Triathlon | September | Sprint Triathlon
Take on a multi-activity or distance event and take the opportunity to race around this unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
- Chip timing
- Enter online
- Flat
- PB
- Age 15 & over
- 750 m lake swimming
- 20 km road cycling
- 5 km road running