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Trail Running Calendar near Brentwood 2025-2026

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Explore the top trail runs near Brentwood for 2025-2026! We've gathered 51 exciting races in the area. Check out our detailed list below to find your next local race.

May 2026
May
10
Sunday

Oliver Fisher 10K & 5K

Trail Run 5 km 10 km
May
23-25
Sa - Mo

Grand Union Canal 145 Mile (GUCR)

Trail Run 11 mi 22 mi ... 133 mi 145 mi
May
30
Saturday

Three Castles 50Km

Trail Run 50 km
May
30
Saturday

Castle Trails 30km

Trail Run 30 km
June 2026
Jun
6-7
Sa - Su

Sundowner Marathon

Trail Run Marathon
Jun
20
Saturday

Beyond Trails London

Trail Run 26 km 55 km
Jun
27
Saturday

Zigzag - Cock-A-Doodle Dawdle

Trail Run 5 km 10 km Half Marathon Marathon
July 2026
Jul
3-4
Fr - Sa

The Full Essex Way Ultra

Trail Run 82 mi
Jul
5
Sunday

The Bishop's Stortford Mitre 10k

Trail Run 5 km 10 km
Jul
19
Sunday

ATW St Albans Summer 10k

Trail Run 10 km
August 2026
Aug
16
Sunday

The Black Bull 15 Trail Runs

Trail Run 15 km 15 mi
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