Ever wondered what it feels like to run past a 12th-century castle, a national stadium, and a buzzing waterfront — all in one race? That’s exactly what the Cardiff Half Marathon 2026 delivers, and it’s why the event has grown into one of Europe’s biggest road races.
Whether you’re chasing a personal best on one of the UK’s flattest courses or lining up for your very first 13.1 miles, this guide covers everything: the official date, the route, how entry works this year, what it costs, and how to train smart in the weeks before race day.
The Cardiff Half Marathon is Wales’ largest mass-participation event and the UK’s second-largest half marathon. It’s also a member of the SuperHalfs series and carries an Elite Label from World Athletics, placing it among the most competitive and well-organised half marathons in the world.
Each year the race draws tens of thousands of participants — over 27,000 runners crossed the line in the half marathon in recent editions, alongside junior races the day before. The result is a genuine city-wide occasion, with thousands of spectators lining the streets from start to finish.
| Detail | Information |
|---|---|
| Date | Sunday, 4 October 2026 |
| Location | Castle St, Cardiff CF10 1BT, Wales |
| Distance | 13.1 miles (half marathon) |
| Start time | 10:00 AM (varies slightly by wave) |
| Cut-off time | 4 hours |
| Course type | Flat, fast, single loop |
| Series | SuperHalfs, World Athletics Elite Label |
Mark the date: race day falls on Sunday, 4 October 2026. Start waves — Ballot, Charity, Reserved, and Business Challenge — all begin around 10:00 AM, so give yourself plenty of time to reach the start pens in central Cardiff.
One of the biggest draws of this race is the scenery. The course is famously flat and fast, which makes it a popular choice for runners chasing a PB, but it’s also genuinely scenic. Along the 13.1 miles you’ll pass:
Highlights of the Cardiff Half Marathon 2026
Why You Should Participate in the Cardiff Half Marathon 2026
- Cardiff Castle — a striking start-line backdrop with over 2,000 years of history
- Principality Stadium — home of Welsh rugby, right in the heart of the route
- Cardiff Civic Centre — grand Edwardian architecture around City Hall
- Cardiff Bay — a waterfront stretch that’s especially lively with spectators
Because the course loops through the city rather than heading out into open countryside, crowd support stays strong for almost the entire race — something many first-time half marathoners say makes a real difference in the tougher middle miles.
Entry for 2026 works differently than in previous years. Because demand has outstripped available spaces — the 2025 race reportedly sold out within hours — organisers introduced a ballot system for 2026, run separately for UK and international applicants.
There are four main ways to secure a place:
- Ballot entry — the main route for most runners, drawn at random
- “Skip the Ballot” options — limited guaranteed-entry packages
- Charity places — offered through official race charities in exchange for a fundraising commitment
- Business Challenge packages — for companies entering teams
Heads up: the standard registration deadline for confirmed entrants was Tuesday, 1 September 2026, and general ballot/public entry has now closed for this edition. If you haven’t secured a place yet, your best remaining option is almost always a charity place — several official charity partners still had capacity close to race day, though availability changes fast, so check directly with individual charities.
Costs vary depending on which route you take into the race. Here’s a general breakdown based on recent charity partner listings for 2026:
| Entry type | Typical fee | Fundraising minimum |
|---|---|---|
| Self-funded charity place | £130 | None |
| Fundraising charity place | £15–£65 | £200–£350 |
| University/community team place | £10 | £250 |
| Standard ballot entry | ~£36–£42 | None |
Charity places usually come with two options: a lower entry fee paired with a fundraising target, or a higher “self-funding” fee with no minimum sponsorship required. If you’re entering through a charity, read the terms carefully — some ask for sponsorship money to be collected by a set deadline after the race.
If you’ve secured your place, race-week nerves are normal — but a sensible final stretch of training will help you arrive at the start line confident rather than exhausted.
Weeks 8–6 before race day
- Build your long run to 8–10 miles
- Keep 2–3 easy runs per week at a conversational pace
- Add one session of light hill or tempo work
Weeks 5–3 before race day
- Peak long run: 11–12 miles
- Practice your race-day fuelling strategy on long runs
- Start breaking in the shoes you’ll wear on the day
Final 2 weeks — taper
- Cut weekly mileage by roughly a third
- Keep runs short and easy; avoid new hard sessions
- Focus on sleep, hydration, and carbohydrate intake in the final 3–4 days
Since the Cardiff course is flat, you don’t need heavy hill training — but you do want a few faster-paced sessions so your legs are used to sustained pace on level ground.
A flat, fast course still deserves solid preparation. Typical race-day kit includes:
- Moisture-wicking running top and shorts/tights — tested on a long run beforehand
- Well broken-in running shoes — never race in brand-new shoes
- A running belt or vest for gels, phone, and race number
- Energy gels or chews for fuelling around mile 6–8
- A lightweight throwaway layer for the cool October start, most events have donation points at the start line
- Body glide or anti-chafe balm, especially useful over 13.1 miles
- The event is organised by Run 4 Wales
- Recent editions have attracted around 27,000–29,000 total participants, including junior races
- It’s Wales’ largest multi-charity fundraising event
- The race carries a World Athletics Elite Label and is part of the SuperHalfs series, alongside other major UK and international half marathons
- Past champions have included elite Kenyan athletes in both the men’s and women’s fields, alongside a competitive wheelchair race
When is the Cardiff Half Marathon 2026? The race takes place on Sunday, 4 October 2026, in Cardiff, Wales.
Is the Cardiff Half Marathon course flat? Yes. It’s known as one of the flattest, fastest half marathon courses in the UK, making it popular with PB-chasers.
How do I enter the Cardiff Half Marathon 2026? Entry is via a public ballot, limited guaranteed-entry options, official charity places, or Business Challenge team packages. The general ballot and standard registration deadline have already passed for 2026, so charity places are typically the best remaining route.
What is the cut-off time for the Cardiff Half Marathon? Runners have 4 hours to complete the 13.1-mile course.
How many people run the Cardiff Half Marathon each year? Recent editions have drawn around 27,000+ half marathon finishers, plus additional participants in the junior races.
Can I still get a place if the ballot has closed? Often yes, through official charity partners, though spaces fill quickly and vary charity to charity — it’s worth contacting a few directly.
The Cardiff Half Marathon 2026 combines a genuinely fast, flat course with some of Wales’ most iconic scenery and one of the loudest crowds you’ll find at a UK road race. Whether you’re aiming for a personal best or simply want to finish strong on your first 13.1 miles, race day on Sunday, 4 October 2026 promises to be a memorable one.
If you haven’t secured your place yet, check in with the official charity partners soon — spaces for 2026 are limited. And if you’re already in, start locking in those long runs now, because race day will be here before you know it.
Ready for race day? Browse our guide to the best half marathon gear to make sure you’re fully kitted out before you toe the start line.
