On 4 October 2026, runners will gather in Cardiff to take on one of the UK’s biggest and most admired half-marathons. The course is flat, fast and scenic, winding past landmarks such as Cardiff Castle, the Principality Stadium and Cardiff Bay before finishing at the Civic Centre. Known for its vibrant crowds and festival atmosphere, this race attracts both elite athletes and first-time half-marathoners. With places in the event now allocated via a ballot due to high demand, the Cardiff Half Marathon continues to grow in reputation, scale and ambition. Whether you’re pursuing a personal best or simply soaking up a major city race experience, this event is designed to deliver.
Race
Taking place on Sunday, 4 October 2026, this iconic half-marathon through the streets of Cardiff is organised by Run 4 Wales. The flat, fast 13.1-mile course winds past landmarks such as Cardiff Castle, the Principality Stadium and Cardiff Bay, making it one of the UK’s largest and most scenic autumn running events.
Weather based on historical averages.
FAQs
What is the Cardiff Half Marathon?
How long is the Cardiff Half Marathon?
Where does the Cardiff Half Marathon take place?
What is the elevation gain of the Cardiff Half Marathon?
How can I prepare for the Cardiff Half Marathon?
How do I choose the right training plan for the Cardiff Half Marathon?
Taking place on Sunday, 4 October 2026, this iconic half-marathon through the streets of Cardiff is organised by Run 4 Wales. The flat, fast 13.1-mile course winds past landmarks such as Cardiff Castle, the Principality Stadium and Cardiff Bay, making it one of the UK’s largest and most scenic autumn running events.
The Cardiff Half Marathon is 21km long.
The Cardiff Half Marathon takes place in Cardiff, UK.
Runna classifies the Cardiff Half Marathon elevation profile as Flat.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Cardiff Half Marathon?
Taking place on Sunday, 4 October 2026, this iconic half-marathon through the streets of Cardiff is organised by Run 4 Wales. The flat, fast 13.1-mile course winds past landmarks such as Cardiff Castle, the Principality Stadium and Cardiff Bay, making it one of the UK’s largest and most scenic autumn running events.
How long is the Cardiff Half Marathon?
The Cardiff Half Marathon is 21km long.
Where does the Cardiff Half Marathon take place?
The Cardiff Half Marathon takes place in Cardiff, UK.
What is the elevation gain of the Cardiff Half Marathon?
Runna classifies the Cardiff Half Marathon elevation profile as Flat.
How can I prepare for the Cardiff Half Marathon?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Cardiff Half Marathon?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by Cardiff Half Marathon or Run 4 Wales. All event details are based on publicly available information and are provided solely to help users discover running events. Runna does not use any official logos, images, or proprietary content from this event or its organiser. Any trademarks or names mentioned are used descriptively to identify the event in a factual manner. For the most accurate and up to date information (including to register or purchase an entry to the event), please visit the Cardiff Half Marathon website.
