Runners spread across a city avenue during a marathon

Cardiff Half Marathon

0975 km half marathon run through the streets of Cardiff, Wales. It holds a World Athletics Elite Road Race Label and is part of the European SuperHalf Series.

Prepare for Cardiff Half Marathon

A plan built from your answers and your race date.

half marathon training plan

Cardiff, the Welsh capital, hosts one of the largest half marathons in the United Kingdom. The route is entirely on road and flat, taking in the city centre, the bay area and park sections, in the atmosphere of a big mass-participation race with strong crowd support throughout.

The race carries a World Athletics Elite Road Race Label and belongs to the SuperHalf Series, the European half marathon circuit.

The formats

One format only.

Format	Distance
Semi-marathon	13.1 mi

Organizer information, checked on September 21, 2026 · cardiffhalfmarathon.co.uk

When to start

At this distance, a build usually runs 10 to 16 weeks. The 2027 date is not published, so counting back from October puts the start around June 21, 2027.

These ranges are working conventions, not a research finding — no trial has compared plan lengths against each other. What matters more is that the plan was built for the weeks you actually have, rather than shrunk down from a longer one.

How to choose your start date

When to start

June 21, 2027

→ August 2, 2027

Worth reading before you enter

Races and distances 10K, half, marathon: what each one really asks They are all running. They are not the same event. What limits you, how long you need, and how the race falls apart — all three change with the distance. Read Races and distances The big marathons: what each one actually demands A marathon is 42.195 km everywhere. What changes is the profile, the crowd, the weather you are likely to get — and so what your training should emphasise. Read Training Eating and drinking: what’s proven, what isn’t This is where confident advice most often runs ahead of the evidence. Some of it is well tested. Some is opinion wearing a number. And one common habit can kill you. Read

Questions

What is the date of Cardiff Half Marathon in 2027?

The organizer has not published the 2027 date for Cardiff Half Marathon yet. The race is usually held in October, in Cardiff.

How do I enter the Cardiff Half Marathon 2027?

Joining the list means you are notified as soon as places are released by the organiser.

Is the Cardiff Half Marathon a fast course?

Yes. 0975 km city route is flat and quick, and the race holds a World Athletics Elite Road Race Label. It attracts elite athletes alongside club and recreational runners chasing a personal best.

Other races

This list keeps growing; it draws no line. A race that is missing is prepared for in exactly the same way.

Bath · United KingdomHalf marathon GetPRO Bath Half Marathon Mar 14 1 km half marathon run through the streets of central Bath, England. Reading · United KingdomHalf marathon Green Park Reading Half Marathon Mar 21 A Mini Marathon runs alongside it for younger participants on the same day. London · United KingdomHalf marathon London Landmarks Half Marathon Apr 4 0975km route strings together the capital's best-known landmarks on roads shut to traffic. Your race is not here? Tell us about your race You can prepare for it all the same. Any race, anywhere, and even a goal without a race.

Your race is on the calendar. Your plan should be too.

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