Races Half marathon · Llanelli, UK
Llanelli Half Marathon
Llanelli Half Marathon is a flat half marathon in Llanelli, UK, held each May. The organiser says the route mostly follows flat terrain along the Millennium Coastal Path, with some closed roads. The 2027 route has not yet been published. Late May on the Carmarthenshire coast is usually mild, with temperatures of about 9 to 17°C and a chance of sea breeze. Flat courses like Llanelli's reward metronomic pacing — the danger is going out faster than goal pace because it feels cheap early.
Page rebuilt 2026-11-14 · race facts not independently verified — confirm dates and entries on the official race site
When
May
next: Sunday 23 May 2027
Course
flat
Half marathon
Conditions
Late May on the Carmarthenshire coast is usually mild, with temperatures of about 9 to 17°C and a chance of sea breeze.
Racing this course well
The organiser says the route mostly follows flat terrain along the Millennium Coastal Path, with some closed roads. The 2027 route has not yet been published.
Flat courses like Llanelli's reward metronomic pacing — the danger is going out faster than goal pace because it feels cheap early.
Getting a place
- How you get in
- Open entry: first come, first served
- Price
- General entry from £32 plus fees (2027 race)
Official Llanelli Half Marathon site →Checked November 2026
Race day
- Next race
- Sunday 23 May 2027
- Also on the day
- 10k
The course in numbers
- Surface
- Millennium Coastal Path and closed roads
Worth knowing
- The event used to be known as the Llanelli Waterside Half Marathon and now carries a Tata Steel sponsor name.
Pick your goal for Llanelli
Pace charts, weekly structure and timelines for the most common half marathon goals:
The date shown is the one the organiser has announced. Change it if yours differs.
Build your training around Llanelli Half Marathon.
RunV works backwards from race day to today. Your plan adapts when life interrupts, and you approve every change. It does not adapt to this specific course — the pacing guidance above is where the course knowledge is.
Everything above stays free and complete — this is an optional next step, not a paywall.
Asked often
- When is the Llanelli Half Marathon?
- The next Llanelli Half Marathon is on Sunday 23 May 2027 in Llanelli, UK. It is held each May.
- Is the Llanelli Half Marathon course flat?
- The organiser says the route mostly follows flat terrain along the Millennium Coastal Path, with some closed roads. The 2027 route has not yet been published.
- How do I enter the Llanelli Half Marathon?
- Open entry: first come, first served. Price: General entry from £32 plus fees (2027 race).
- How should I train for the Llanelli Half Marathon?
- Match your preparation to Llanelli Half Marathon's profile and the May weather, then protect consistency — with RunV Premium you can adapt your plan to fit your week, so one bad week never derails the block.
Not sure what to target? Predict your half marathon time from a recent race →
More half marathon races
Supplements research for this distance
Build for Llanelli — around your actual life
RunV engineers your block backwards from race day in May — and adapts it when training doesn't go to script. You approve every change.
