Triathlon Calendar United Kingdom
Triathlon Calendar United Kingdom is an events calendar for triathlons, aquathons and duathlons: any multi-discipline events which include running. The following is a list of triathlons around United Kingdom.
To filter the events by keywords, location, date range and event type - go to SEARCH.
Showing the list of events on a map is a great way of finding events near you, but is limited to logged in premium members.
Log in/register here, and find out more about our levels of membership and upgrade today if you are not already premium.
Premium membership provides an ad-free experience, and adds a number of useful functions to help you more easily find events near you, including location based searching and seeing the results on a map.
Events 1 to 48 of 48
Hever Castle Triathlon & Multisport Festival
Saturday, 27 September 2025 to Sunday, 28 September 2025Hever Castle, Edenbridge, Kent, UK
Warwickshire Triathlon
Sunday, 28 September 2025Stratford Leisure Centre, Stratford-upon-Avon, UK
Kielder Marathon
Saturday, 4 October 2025 to Sunday, 5 October 2025Kielder, Hexam, Northumberland, UK
Llandudno Triathlon & Duathlon
Saturday, 4 October 2025Llandudno, Conwy, North Wales, UK
Wilmslow Autumn Triathlon
Sunday, 5 October 2025Wilmslow Leisure Centre, Wilmslow, UK
Oulton Park Autumn Duathlon
Sunday, 19 October 2025Oulton Park, Cheshire, UK
Dorchester Sprint Triathlon
Sunday, 26 October 2025Dorchester, UK
The Dirty Devil Stampede
Saturday, 17 January 2026 to Sunday, 18 January 2026 (Date TBC)Bovington, Wareham, UK
XTERRA Matterley - Duathlon & Trail Runs
Saturday, 14 February 2026 to Sunday, 15 February 2026Matterley Basin, Winchester, UK
Osprey Sprint Triathlon
Sunday, 12 April 2026Portland, Dorset, UK
Stratford Triathlon
Sunday, 19 April 2026Stratford Leisure Centre, Stratford-upon-Avon, UK
Early Brigg Sprint Triathlon
Sunday, 26 April 2026Brigg, North Lincolnshire, UKWilmslow Spring Triathlon
Sunday, 26 April 2026Wilmslow Leisure Centre, Wilmslow, UK
Cheshire Kids Fun Duathlon
Saturday, 9 May 2026Nantwich, Cheshire, UK
Cheshire Triathlon
Sunday, 10 May 2026Nantwich, Cheshire, UK
Outlaw Nottingham Triathlon
Saturday, 16 May 2026 to Sunday, 17 May 2026National Water Sports Centre, Nottingham, UK
Storm The Castle Duathlon
Sunday, 17 May 2026Ludlow, Shropshire, UK
Swansea Triathlon
Sunday, 24 May 2026Swansea, Wales, UK
Henley Kids Fun Triathlon
Saturday, 30 May 2026Henley-on-Thames, Oxfordshire, UK
Henley Triathlon
Sunday, 31 May 2026Henley-on-Thames, Oxfordshire, UK
Blenheim Palace Triathlon
Saturday, 6 June 2026 to Sunday, 7 June 2026Blenheim Palace, Woodstock, UK
Wales Triathlon
Saturday, 6 June 2026Fishguard, Pembrokeshire, UK
IRONMAN 70.3 Bolton
Sunday, 7 June 2026Bolton, UK
Shropshire Triathlon
Saturday, 13 June 2026The Mere, Cremorne Gardens, Ellesmere, UK
Studland Swimrun
Saturday, 13 June 2026Studland, Dorset, UK
Slateman Triathlon & Duathlon
Sunday, 14 June 2026Llanberis, Gwynedd, UK
UK Ultimate Triathlon
Sunday, 14 June 2026The Mere, Cremorne Gardens, Ellesmere, UK
Weymouth Triathlon
Sunday, 14 June 2026Weymouth, Dorset, UK
Abersoch Triathlon
Saturday, 20 June 2026Abersoch, Gwynedd, Wales, UK
Cholmondeley Castle Triathlon & Multisport Festival
Saturday, 20 June 2026 to Sunday, 21 June 2026Cholmondeley Castle, Cheshire, UK
Accuro Jersey Triathlon
Sunday, 28 June 2026Jersey, Channel Islands, UK
The Northumbrian Triathlon
Sunday, 28 June 2026Kielder, Hexam, Northumberland, UKOutlaw Holkham Triathlon
Saturday, 4 July 2026 to Sunday, 5 July 2026Holkham Estate, North Norfolk, UK
Birmingham Triathlon
Saturday, 11 July 2026Sutton Park, Sutton Coldfield, Birmingham, UKUpton Triathlon & Duathlon
Saturday, 11 July 2026Upton-upon-Severn, Worcester, UK
Eastbourne Triathlon Festival
Sunday, 12 July 2026Western Lawns, Eastbourne, UK
IRONMAN 70.3 Swansea
Sunday, 12 July 2026Swansea, Wales, UK
Belvoir Castle Triathlon & Multisport Festival
Saturday, 18 July 2026 to Sunday, 19 July 2026Belvoir Castle, Grantham, UK
Bedford Team Triathlon Relays
Sunday, 19 July 2026Box End, Kempston, Bedford, UK
London T100 Triathlon
Saturday, 25 July 2026 to Sunday, 26 July 2026Royal Victoria Dock, London, UKOutlaw Original Triathlon
Saturday, 25 July 2026 to Sunday, 26 July 2026National Water Sports Centre, Nottingham, UK
York Kids Fun Triathlon
Saturday, 15 August 2026York Sports Village, York, UK
York Triathlon
Sunday, 16 August 2026York Sports Village, York, UK
The Restless Xtreme Gravel Triathlon
Saturday, 22 August 2026Lochgoilhead, Cairndow, UK
Alderford Kids Fun Triathlon
Saturday, 5 September 2026Alderford Lake, Whitchurch, UK
Alderford Triathlon
Sunday, 6 September 2026Alderford Lake, Whitchurch, UK
Mumbles Duathlon
Saturday, 26 September 2026Mumbles, Swansea, Wales, UK
Mumbles Triathlon
Saturday, 26 September 2026Mumbles, Swansea, Wales, UK
Events 1 to 48 of 48