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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 52 exciting races across the region. Find your next race in South East (England) below and join the running community at these great events!

June 2025
Jun
15
Sunday

Royal Windsor Triathlon

Triathlon
Jun
15
Sunday

Beachborough & Brackley Triathlon

Triathlon
Jun
15
Sunday

Dartford White Oak Triathlon

Triathlon
Jun
22
Sunday

The Bridge Triathlon

Triathlon
Jun
22
Sunday

Box Hill Triathlon

Triathlon
Jun
22
Sunday

Bayside Sea Swim Triathlon

Triathlon
Jun
29
Sunday

Thorpe Park Sprint Triathlon

Triathlon
July 2025
Jul
2
Wednesday

Midweek Dorney Triathlon

Triathlon
Jul
2
Wednesday

Dorney Lake Triathlon

Triathlon
Jul
6
Sunday

The Swashbuckler Triathlon

Triathlon
Jul
9
Wednesday

Ocean Lake Midweek Splash and Dash 2

Aquathlon
Jul
12
Saturday

Conquer The Chilterns Triathlon

Triathlon
Jul
12
Saturday

Tri and Paratri Festival

Triathlon
Jul
13
Sunday

Dorney Triathlon

Triathlon
Jul
13
Sunday

Dorney Lake Triathlon

Triathlon
Jul
19
Saturday

Castle To Coast Triathlon

Triathlon
Jul
20
Sunday

Holly Hill Triathlon

Triathlon
Jul
20
Sunday

Guildford Triathlon

Triathlon
Jul
20
Sunday

Eton Dorney Family Triathlon

Triathlon
Jul
27
Sunday

Dorney Lake Triathlon

Triathlon
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