Cardiff Half Marathon 2027: Guide to the Ballot, Course and Race Weekend

Cardiff in October: The Half Marathon That Has Grown Too Big to Ignore

There was a time when you could wake up on a Tuesday, decide you fancied running the Cardiff Half and register before lunch. That era is gone. The 2025 race sold out in hours. The 2026 ballot drew five times as many applications as there were available places. And on 4 October 2026, Joyciline Jepkosgei stood on King Edward VII Avenue in a new women’s course record of 1:05:40 while more than 24,000 runners crossed the line behind her. Cardiff is no longer a well-kept secret. It is one of the best half marathons in Europe and the world’s running community has figured that out.

The race threads through Wales’ capital in a way that feels nothing like an out-and-back slog or a looped circuit. You start outside Cardiff Castle, run past the Principality Stadium and Cardiff City Stadium, head south to the coast at Penarth Marina, cross the Barrage into Cardiff Bay with the Senedd and Wales Millennium Centre on your left, loop Roath Park Lake and finish under the elm-lined boulevard of King Edward VII Avenue at the Civic Centre. Every kilometre gives you something to look at. The course is flat enough for a serious PB attempt and distinctive enough to remember years later.

For international runners, Cardiff is also one leg of the SuperHalfs series alongside Lisbon, Prague, Berlin, Copenhagen and Valencia — all World Athletics label events. In 2026 alone, more than 10,500 SuperHalfs runners took part and 700 of them completed the full series on King Edward VII Avenue. Run 4 Wales have also removed the previous 60-month deadline for series completion. If you are working through the SuperHalfs passport, Cardiff is the leg most people describe as their favourite.

The 2027 race takes place on Sunday 3 October. The ballot for your place is open right now and closes on 18 October 2026 — if you are reading this, you have a week to enter. If you have already secured your place, or you are planning ahead, everything you need for race weekend is below.

Cardiff Half Marathon 2027 Ballot: How to Register

With demand for Cardiff Half places growing every year, Run 4 Wales introduced a ballot system for the first time in 2026 — the year the race’s popularity made a simple first-come, first-served registration unworkable. The ballot is free to enter. You register your details and payment information. If you are drawn, your entry fee is taken automatically and your place is confirmed. No queues, no crashing at 9am, no alarm clocks. Just register before the 18 October midnight deadline.

A separate UK ballot and International ballot run simultaneously to ensure a fair split between home runners and overseas participants, particularly those completing the SuperHalfs series. International runners can enter as a team of up to three — only the lead booker enters the draw, but if they are successful all three receive places. Entering multiple teams to improve your odds results in disqualification.

Entry Fees and Options

If you are unsuccessful in the ballot, charity places open from 22 October 2026. Official partner charities include the NSPCC (lead charity), Alzheimer’s Society, Cancer Research Wales, Mind, Tŷ Hafan, British Heart Foundation and Wales Air Ambulance among others. Running for charity requires a minimum fundraising pledge and guarantees your place without entering the draw.

Enter the 2027 Cardiff Half Marathon ballot →

Race at a Glance

What Makes Cardiff Half Worth Running?

One of the Flattest Certified Half Marathon Courses in the UK

The elevation profile on Cardiff is not a case of selective marketing. The course loses maybe 10 metres of net elevation from start to finish and the only thing approaching a gradient is the gentle coastal approach to Penarth Marina. If you are chasing a personal best, this course is designed for it. The men’s record sits at 59:22 and the women’s at 1:05:40 — both set in recent editions by East African elites who specifically choose Cardiff because they know time is possible here. The AIMS / World Athletics Grade B certification means your clock stops on an accurately measured course every time.

The Route Doubles as a Tour of Cardiff’s Best Bits

Cardiff Castle is literally the starting pistol backdrop. You run alongside both of Wales’s major stadiums within the first three kilometres, drop south to the Penarth coastline, cross the Cardiff Bay Barrage with water on both sides, pass the Senedd (the Welsh Parliament) and the Wales Millennium Centre in the same kilometre, loop Roath Park Lake and finish on the civic grandeur of King Edward VII Avenue. There is not a single boring stretch on this course. The architecture and the scenery do a significant amount of work when the legs are tired.

Thirteen Entertainment Zones and One of the UK’s Loudest Running Crowds

Cardiff’s rugby culture has given this city a very specific skill: making noise. The 2026 course placed 13 live acts along the route — from Batala Bristol’s samba drumming at the Barrage to a Superchoir at Roath Park Lake — at exactly the moments runners need them most. The Ein Dinas initiative (Welsh for “Our City”) brings community groups, cheer squads and local organisations into the quiet sections. Corbett Road near the finish has big screens, prize giveaways and is two-deep on both sides. This is a race where the crowd does some of the pacing for you.

Your SuperHalfs Passport Counts Here

Cardiff is one of six legs of the SuperHalfs series alongside Lisbon, Prague, Berlin, Copenhagen and Valencia — all World Athletics label events run on fast, certified city courses. Over 10,500 SuperHalfs runners competed in Cardiff in 2026 and 700 completed the full series on King Edward VII Avenue. Run 4 Wales has also removed the previous 60-month time limit on series completion, so there is no deadline pressure. If Cardiff is the leg you are missing, the ballot is how you get it — or a charity place if the ballot does not go your way.

The Race Has Serious World Athletics Credentials

Cardiff is one of only three UK events to hold a World Athletics Elite Race Label — the others being the London Marathon and the Antrim Coast Half. This is not a marketing badge. It means the course is independently certified, the elite field meets World Athletics standards and the timing system is verified to Grade B accuracy. Cardiff hosted the 2016 IAAF World Half Marathon Championships, the 2015 British Half Marathon Championships and the 2018 Commonwealth Half Marathon Championships. The Welsh Half Marathon Championships are held here every year. When you finish on King Edward VII Avenue, you finish on a course that has been used to crown world champions.

Easy to Reach, Compact to Navigate

Cardiff Central station sits 10-15 minutes’ walk from the start. Direct trains run from London Paddington in around two hours, from Bristol in 50 minutes and from Manchester in approximately two and a half hours. Cardiff Airport is the official race partner and Bristol Airport — roughly 40 minutes by road — has broader international connections. Most city-centre hotels are within easy walking distance of both the start and the finish. For a race of this calibre, the logistics are unusually straightforward.

The Course — Mile by Mile

Kilometres 0-3: Cardiff Castle to the Stadiums — The Most Dangerous Miles on This Course

The race starts directly outside Cardiff Castle on Castle Street and turns immediately into the first trap. The road is wide, the crowd noise is enormous and your legs feel like they could run forever. Within two kilometres you are running alongside the Principality Stadium — Wales’ 74,000-capacity rugby cathedral — and then Cardiff City Stadium at Sloper Road where the first entertainment zone sits. These three kilometres are where virtually every recreational runner goes 10-15 seconds per kilometre faster than planned. The city is loud, there is no headwind and nothing hurts yet. Bank time here only if you are doing it deliberately. Most people who blow up at Roath Park trace the problem back to this stretch.

Kilometres 3-7: Sloper Road South to Penarth — Where the Field Spreads and the Work Becomes Internal

After the stadiums, the field thins and the crowd noise drops. The route heads south out of the city centre on roads that are flat but noticeably quieter. The entertainment zone at the Pumping Station on Sloper Road provides a beat to run to. But from here, pace has to come from within. This is the section where the gap between planned pace and actual effort becomes clear — if you are already breathing hard through Sloper Road, you went out too fast in the first three kilometres. Use the quieter kilometres to settle and find your rhythm. The next four kilometres will decide the second half of your race.

Kilometres 7-10: Penarth Marina — The Beautiful Deception

The route drops into Penarth, one of Cardiff’s most attractive coastal suburbs, and takes in the marina. The VOG Brass Band at the Oyster Catcher pub is a proper mid-course lift. The scenery here is genuinely good — clean water views, sea air, a moment of running by the coast that feels nothing like a city race. This is where Cardiff flatters you most convincingly. Legs feel fine. Conditions feel easy. The slight coastal breeze is manageable. What is actually happening is that you are approaching the midpoint of the race with glycogen stores quietly depleting. Enjoy Penarth. Do not let it talk you into pace you cannot sustain.

Kilometres 10-13: The Barrage and Cardiff Bay — One of the Best Stretches in British Road Running

Crossing the Cardiff Bay Barrage is the visual highlight of the race. The causeway runs between two bodies of water and is exposed to whatever wind the day brings — a headwind here is a real factor, not a negligible one. After the Barrage, the route enters Cardiff Bay proper: the Norwegian Church, Roald Dahl Plas, the Senedd and the Wales Millennium Centre in the space of less than two kilometres. Batala Bristol’s samba drumming at the Barrage car park arrives at exactly the right moment — around half distance when the body starts asking questions. Cardiff Bay is where the crowds build again after the quieter mid-section. Run through it. Do not sprint through it.

Kilometres 13-17: Cathays — The Long Quiet Grind

After Cardiff Bay the route turns north through Cathays toward Roath. On paper this looks like a recovery section — flat roads heading toward the lake. In practice it is kilometre 13 to 17, which means mile 8 to 10.5, and the legs know the difference. Entertainment zones at the Magic Roundabout and Pen Y Lan Community Centre help. The Rock Choir and Tune Truck zones are well placed. But this is where the honest conversation between a runner and their body happens. Anyone who went out even five seconds per kilometre too fast through the first half will feel a slow-building tightness in the quads through Cathays. Hold form, shorten the stride if necessary and do not panic. The race is not lost here. It can be held.

Kilometres 17-19: Roath Park Lake — Where Cardiff Half Times Are Made or Broken

The loop around Roath Park Lake arrives at kilometre 17 — approximately mile 10.5. On any elevation chart it reads as flat relief. It is flat. But it is also the point where the race has been running for over an hour, glycogen is genuinely depleted for anyone who started too fast and the loop format means you can see other runners at different stages of the same lap. The psychological load of watching faster runners ahead of you while your legs go heavy is one that course profiles do not capture. This is the specific kilometre where recreational Cardiff Half times are won or lost. The Superchoir at the top of the lake loop is extraordinarily well timed. Use it. This is the place to race, not the place to drift.

Kilometres 19-21.1: Cathays Terrace to King Edward VII Avenue — Commit and Get Home

From Roath the route tracks back through Cathays Terrace toward Corbett Road and the city. The crowd builds again from here. Corbett Road has big screens, music and spectators two-deep on both sides — it is the loudest stretch since the stadiums and arrives when you need it most. Then the turn onto King Edward VII Avenue. The finish looks further than it is. The tiered terraces are visible. The finish line will appear when your legs have forgotten how to lift. Commit to the boulevard, hold whatever form you have left and get across the timing mat. The time on the clock is fixed the moment your chip crosses.

Race Weekend Schedule

Weather on Race Day

Cardiff’s early October weather is honest rather than extreme. Temperatures are close to ideal for half marathon racing — cool enough to run fast, warm enough that you will not seize up at the start line. The bigger variable is wind, particularly on the Barrage crossing at km 10. Check the forecast on the Friday before the race. A disposable top layer for the start corral is useful if conditions are cold and wet at gun time. Most runners drop it within the first kilometre and the event collects and donates discarded clothing.

Prize Money and Elite Field

Past Results — Defending Champions

2026 Cardiff Half Marathon — 4 October 2026

2025 Oysho Cardiff Half Marathon — 5 October 2025

Course Records

Full results archive on the official Cardiff Half Marathon site →

Spectator Guide — Where to Watch

Where to Stay for Race Weekend

Cardiff is a compact city. Most hotels in the city centre are within 10-15 minutes’ walk of both the start at Cardiff Castle and the finish at King Edward VII Avenue. Book as early as possible: race weekend accommodation sells out quickly and prices surge sharply in the two weeks before the race. If you are travelling from another UK city, consider arriving Saturday to collect your race pack without the Sunday morning rush.

International Runners — Visa and Travel

A Short History of the Cardiff Half Marathon

The Cardiff Half Marathon was first run in 2003, alongside a full marathon that shared the same event weekend. As the half grew in popularity and the field sizes increased year on year, the full marathon was quietly dropped after 2006. Cardiff became a half marathon-only event and has never looked back. From the beginning it was organised by Run 4 Wales, a not-for-profit social enterprise whose mandate is to use event revenue to fund grassroots athletics across Wales. That structure has shaped the race’s identity: charitable in approach, genuinely community-focused and increasingly ambitious in its elite programming. The 100 Club — the community of runners who have completed multiple Cardiff Half editions — reflects how deeply the race is woven into the local running culture.

The race’s international profile took its biggest leap in 2016 when Cardiff hosted the IAAF World Half Marathon Championships. Geoffrey Kamworor of Kenya won the men’s title and Peres Jepchirchir took the women’s — both on the same city-centre course that recreational runners use every October. Hosting the World Championships gave Cardiff a template for running world-class elite fields alongside mass participation on the same closed streets, and the race has maintained that ambition ever since. The 2014 and 2015 editions hosted the British Half Marathon Championships. The 2018 race hosted the Commonwealth Half Marathon Championships. Cardiff now sits alongside the London Marathon and the Antrim Coast Half as one of only three UK races to hold a World Athletics Elite Race Label.

The 2026 edition — the 23rd running — became the largest in the race’s history by international reach. More than 5,700 runners from 99 countries entered, a new record. Joyciline Jepkosgei set a women’s course record that had stood since 2017. The race introduced its ballot entry system for the first time, an acknowledgement that demand had outgrown anything a conventional registration could manage fairly. For 2027 — the 24th edition — Cardiff arrives with more international credibility, a stronger elite field and a ballot system that for the first time reflects genuine global appetite for this race. It is not where it started. It is better.