Debuting on September 13–14, 2025, the Festival des 3 Forêts offers one of the first ultra-trail experiences in Île‑de‑France, starting in Mériel and linking three iconic forest massifs: Carnelle, Île‑Adam, and Montmorency. . Runners can choose from seven distances—ultra-trail options of 162 km (4 800 m+), 100 km (2 500 m+), 70 km (1 700 m+), 65 km (2 500 m+), 45 km (1 500 m+), 25 km (650 m+), and a 13 km loop (300 m+)—with events spanning both days. . The scenic routes traverse woodland trails, Vexin naturel park, riverside paths, and quaint villages, with multiple aid stations, water points, and generous cutoff times (up to 36 h for the 162 km ultra). . Organisers aim to blend ultrarunning performance with regional discovery, showcasing local heritage and inviting community support for this inaugural event.
Races
162 km
100 km
70 km
65 km
45 km
25 km
13 km
Race Date:
14 September, 2025
Scheduled for Sunday, September 14, 2025, the 13 km trail begins in Mériel and takes runners on a scenic loop through forested trails, with approximately 300 meters of elevation gain. Organized by Sport Nature pour Tous, this short-distance race offers an accessible introduction to trail running in the lush landscapes of Val-d’Oise.
Weather based on historical averages.
FAQs
What is the Forets 13?
How long is the Forets 13?
Where does the Forets 13 take place?
What is the elevation gain of the Forets 13?
How can I prepare for the Forets 13?
How do I choose the right training plan for the Forets 13?
Scheduled for Sunday, September 14, 2025, the 13 km trail begins in Mériel and takes runners on a scenic loop through forested trails, with approximately 300 meters of elevation gain. Organized by Sport Nature pour Tous, this short-distance race offers an accessible introduction to trail running in the lush landscapes of Val-d’Oise.
The Forets 13 is 13km long.
The Forets 13 takes place in Mériel, France.
The Forets 13 elevation gain is 300 metres, which Runna classifies as a Hilly race.
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 Forets 13?
Scheduled for Sunday, September 14, 2025, the 13 km trail begins in Mériel and takes runners on a scenic loop through forested trails, with approximately 300 meters of elevation gain. Organized by Sport Nature pour Tous, this short-distance race offers an accessible introduction to trail running in the lush landscapes of Val-d’Oise.
How long is the Forets 13?
The Forets 13 is 13km long.
Where does the Forets 13 take place?
The Forets 13 takes place in Mériel, France.
What is the elevation gain of the Forets 13?
The Forets 13 elevation gain is 300 metres, which Runna classifies as a Hilly race.
How can I prepare for the Forets 13?
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 Forets 13?
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!
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Sport:
Running
Tags:
Altitude
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by Festival des 3 Forêts 2025 or Sport Nature pour Tous. 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 Festival des 3 Forêts 2025 website.
