The River Thames Half Marathon 2025 offers runners a picturesque 13.1-mile route along the River Thames, commencing and concluding at the iconic Walton Bridge in Walton-on-Thames, Surrey. The course is predominantly flat and fast, incorporating roads and towpaths leading to Hampton Court Bridge, providing an excellent opportunity for personal bests. Participants will receive a bespoke finisher medal, a technical T-shirt, and a well-stocked goody bag. The event is fully chip-timed and features enthusiastic marshals, water stations at regular intervals, and pacers to assist runners in achieving their target times. With its efficient organization and scenic route, the River Thames Half Marathon is a standout event in the UK’s running calendar.   
Race
Half Marathon
Race Date:
26 October, 2025
The River Thames Half Marathon is scheduled for Sunday, October 26, 2025, in Walton-on-Thames, Surrey, UK, and is organized by River Thames Running. This flat and fast 13.1-mile course starts and finishes at Walton Bridge, following the scenic River Thames towpath and roads to Hampton Court Bridge, making it ideal for first-time half marathoners or those aiming for a personal best.  
Weather based on historical averages. Route data provided by Strava, based on last year's race.
FAQs
What is the River Thames Half Marathon?
How long is the River Thames Half Marathon?
Where does the River Thames Half Marathon take place?
What is the elevation gain of the River Thames Half Marathon?
How can I prepare for the River Thames Half Marathon?
How do I choose the right training plan for the River Thames Half Marathon?
The River Thames Half Marathon is scheduled for Sunday, October 26, 2025, in Walton-on-Thames, Surrey, UK, and is organized by River Thames Running. This flat and fast 13.1-mile course starts and finishes at Walton Bridge, following the scenic River Thames towpath and roads to Hampton Court Bridge, making it ideal for first-time half marathoners or those aiming for a personal best.  
The River Thames Half Marathon is 21km long.
The River Thames Half Marathon takes place in Walton-on-Thames, UK.
Runna classifies the River Thames Half Marathon elevation profile as Flat.
The best way to train for the next race is to use a personalised 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 personalised 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 River Thames Half Marathon?
The River Thames Half Marathon is scheduled for Sunday, October 26, 2025, in Walton-on-Thames, Surrey, UK, and is organized by River Thames Running. This flat and fast 13.1-mile course starts and finishes at Walton Bridge, following the scenic River Thames towpath and roads to Hampton Court Bridge, making it ideal for first-time half marathoners or those aiming for a personal best.  
How long is the River Thames Half Marathon?
The River Thames Half Marathon is 21km long.
Where does the River Thames Half Marathon take place?
The River Thames Half Marathon takes place in Walton-on-Thames, UK.
What is the elevation gain of the River Thames Half Marathon?
Runna classifies the River Thames Half Marathon elevation profile as Flat.
How can I prepare for the River Thames Half Marathon?
The best way to train for the next race is to use a personalised 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 River Thames Half Marathon?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised 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!
More
Sport:
Running
Tags:
Nature
Fun Run
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by River Thames Half Marathon 2025 or RUN-FEST. 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 River Thames Half Marathon 2025 website.
