United Kingdom
12 races in the United Kingdom, held from June to September. 5 are on the IRONMAN circuit, including the full distances IRONMAN Leeds, IRONMAN Wales. 7 races swim in the sea, and average water temperatures go from 15 °C at CELTMAN! XTRI Solo Point Five to 21 °C.
- races
- 12
- circuits
- 4
- months with a race
- 4
- water, coldest to warmest
- 15–21 °C
United Kingdom
- IRONMAN 70.3 Bolton
Bolton, United Kingdom
- Date
- 6 Jun 2027
- Distance
- Middle
- Circuit
- IRONMAN
- Water
- 19 °C
- Bike
- Rolling
- Run
- Rolling
- Entries
- Sold out
- CELTMAN! Extreme Scottish Triathlon
Shieldaig, United Kingdom
- Date
- 12 Jun 2027
- Distance
- Full, extreme
- Circuit
- XTRI
- Water
- n/a
- Bike
- Hilly
- Run
- Hilly
- Entries
- Open
- Royal Windsor Triathlon – Olympic
Windsor, United Kingdom
- Date
- 13 Jun 2027
- Distance
- Olympic
- Circuit
- Independent
- Water
- n/a
- Bike
- n/a
- Run
- n/a
- Entries
- CELTMAN! XTRI Solo Point Five
Shieldaig, United Kingdom
- Date
- 19 Jun 2027
- Distance
- Middle, extreme
- Circuit
- XTRI
- Water
- 15 °C
- Bike
- Hilly
- Run
- n/a
- Entries
- Open
- Lakesman Full
Keswick, United Kingdom
- Date
- 20 Jun 2027
- Distance
- Full
- Circuit
- Independent
- Water
- n/a
- Bike
- n/a
- Run
- n/a
- Entries
- Open
- IRONMAN 70.3 Swansea
Swansea Bay, United Kingdom
- Date
- 11 Jul 2027
- Distance
- Middle
- Circuit
- IRONMAN
- Water
- 16 °C
- Bike
- Hilly
- Run
- Flat
- Entries
- Sold out
- IRONMAN Leeds
Leeds, United Kingdom
- Date
- 15 Aug 2027
- Distance
- Full
- Circuit
- IRONMAN
- Water
- 21 °C
- Bike
- Hilly
- Run
- Hilly
- Entries
- Open
- London T100
London, United Kingdom
- Date
- 22 Aug 2027
- Distance
- 100 km
- Circuit
- T100
- Water
- n/a
- Bike
- Flat
- Run
- Flat
- Entries
- Open
- Supertri Brighton – Olympic
Hove, United Kingdom
- Date
- 29 Aug 2027
- Distance
- Olympic
- Circuit
- Independent
- Water
- n/a
- Bike
- Flat
- Run
- Flat
- Entries
- Open
- IRONMAN 70.3 Weymouth
Weymouth, United Kingdom
- Date
- 12 Sept 2027
- Distance
- Middle
- Circuit
- IRONMAN
- Water
- 17 °C
- Bike
- Rolling
- Run
- Flat
- Entries
- Sold out
- IRONMAN Wales
Pembrokeshire, United Kingdom
- Date
- 19 Sept 2027
- Distance
- Full
- Circuit
- IRONMAN
- Water
- 17 °C
- Bike
- Hilly
- Run
- Hilly
- Entries
- Sold out
- Hever Castle Triathlon The Gauntlet Middle Distance
Hever, United Kingdom
- Date
- 26 Sept 2027
- Distance
- Middle
- Circuit
- Independent
- Water
- n/a
- Bike
- Hilly
- Run
- Rolling
- Entries
- Open