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Half Marathon Calendar near Cardiff Bay 2025-2026

Monthly updates for Cardiff Bay

Get new running races (and updates) in your inbox every month.

Explore the top half marathons near Cardiff Bay for 2025-2026! We've gathered 39 exciting races in the area. Check out our detailed list below to find your next local race.

January 2026
Jan
24
Sa

Saturn Running - Cwmdare

Trail Run 3 km 5 km ... Marathon 50 km
Jan
24
Sa

Saturn Running - Aberdare

Backyard Ultra 3 km 5 km ... Marathon 50 km
Jan
25
Su

Chepstow Running Festival Half Marathon

5 km 10 km Half Marathon
Jan
25
Su

Phoenix Running - Trelewis

Backyard Ultra 5 km 10 km Half Marathon Marathon
February 2026
Feb
1
Su

The Cardiff Half Marathon Winter Warmer Run

5 km 10 km Half Marathon
Feb
14
Sa

Phoenix Running - Trelewis

Backyard Ultra 5 km 10 km Half Marathon Marathon
March 2026
Mar
1
Su

St David's Day Run

5 km 10 km Half Marathon
Mar
1
Su

City Of Newport Half Marathon

Half Marathon
Mar
1
Su

Saturn Running - Cwmdare

Trail Run 3 km 5 km ... Marathon 50 km
Mar
15
Su

Saturn Running - Cwmdare

Trail Run 3 km 5 km ... Marathon 50 km
Mar
22
Su

Merthyr Half Marathon

Half Marathon
Mar
29
Su

Phoenix Running - Trelewis

Backyard Ultra 5 km 10 km Half Marathon Marathon
April 2026
Apr
5
Su

Brabazon Half Marathon

10 km Half Marathon
Apr
19
Su

Newport Wales Marathon

10 km Half Marathon Marathon
Apr
25
Sa

Phoenix Running - Trelewis

Backyard Ultra 5 km 10 km Half Marathon Marathon
Apr
26
Su

Saturn 7 Hour Time Challenge - Aberdare

3 km 7 km ... Marathon 50 km
Apr
26
Su

Saturn Running - Cwmdare

Trail Run 3 km 5 km ... Marathon 50 km
Apr
26
Su

St David's Day Run

5 km 10 km Half Marathon Marathon
May 2026
May
10
Su

Great Bristol Run

10 km Half Marathon
May
30
Sa

Saturn Running - Cwmdare

Trail Run 3 km 5 km ... Marathon 50 km