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Triathlon Calendar South East (England) 2025-2026

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Explore the best triathlons in South East (England) for 2025-2026! Our updated list features 75 exciting races across the region. Find your next race in South East (England) below and join the running community at these great events!

July 2026
Jul
5
Su

The Bridge Triathlon
Triathlon
Jul
11
Sa

Tri and Paratri Festival
Triathlon
Jul
12
Su

Winchester Pedal Paddle Pace
Multisport
Jul
12
Su

Holly Hill Triathlon
Triathlon
Jul
12
Su

Dorney Lake Triathlon
Triathlon
Jul
12
Su

Dorney Triathlon
Triathlon
Jul
18
Sa

Castle To Coast Triathlon
Triathlon
Jul
19
Su

Marlow Triathlon
Triathlon
Jul
26
Su

Dorney Lake Triathlon
Triathlon
Jul
26
Su

Guildford Triathlon
Triathlon
Jul
26
Su

Dorney Triathlon
Triathlon
Jul
26
Su

Big South East Swim & Aquathlon
Aquathlon
August 2026
Aug
2
Su

Cowman Triathlon
Triathlon
Aug
2
Su

The Bridge Triathlon
Triathlon
Aug
8
Sa

Dorney Lake Triathlon
Triathlon
Aug
8
Sa

Dorney Triathlon
Triathlon
Aug
23
Su

Thorpe Park Sprint Triathlon
Triathlon
Aug
26
We

Dorney Lake Evening Sprint Triathlon & Sprint Aquabike
Triathlon
Aug
26
We

Midweek Dorney Triathlon
Triathlon
Aug
31
Mo

Radley Triathlon
Triathlon