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Running Calendar South East (England) 2025-2026

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Explore the best running races in South East (England) for 2025-2026! Our updated list features 477 exciting races across the region. Find your next race in South East (England) below and join the running community at these great events!

Half Marathons Marathons Trail Runs Triathlons
August 2026
Aug
7
Friday

Saturn 7 Hour Time Challenge - Wraysbury

Trail Run 3 km 7 km ... Marathon 50 km
Aug
7
Friday

Saturn Running - Midweek Chasing Numbers

3 km 5 km 7 km 50 km
Aug
8
Saturday

The MTC Windsor Ultra

Trail Run 47 mi
Aug
8
Saturday

Dorney Lake Triathlon

Triathlon
Aug
8
Saturday

Run Dorney Lake Half Marathon

5 km 10 km Half Marathon
Aug
8
Saturday

North Downs Way 100

Trail Run 103 mi
Aug
8
Saturday

Dorney Triathlon

Triathlon
Aug
9
Sunday

Newbury Racecourse Half Marathon

5 km 10 km Half Marathon
Aug
9
Sunday

Mount Ephraim 10K

Trail Run 10 km
Aug
16
Sunday

Henfield Half Marathon

Trail Run Half Marathon
Aug
16
Sunday

Southampton Running Festival

Trail Run 5 km 10 km Half Marathon
Aug
23
Sunday

Thorpe Park Sprint Triathlon

Triathlon
Aug
26
Wednesday

Dorney Lake Evening Sprint Triathlon & Sprint Aquabike

Triathlon
Aug
26
Wednesday

Run Dorney Lake Evening Runs 10k

5 km 10 km
Aug
26
Wednesday

Midweek Dorney Triathlon

Triathlon
Aug
30
Sunday

Windsor Trail Run Half Marathon

Trail Run 10 km Half Marathon
Aug
30
Sunday

Woldingham Marathon

Trail Run 13 mi 26 mi
September 2026
Sep
5
Saturday

Henley River Half Marathon

Trail Run 10 km Half Marathon
Sep
5-6
Sa - Su

South Coast Challenge

Trail Run 25 km 50 km 100 km
Sep
6
Sunday

New Forest Triathlon

Triathlon
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