The 10th edition of Les Courses du Mont-Terrible takes place on April 18–19, 2026, combining competitive challenge with the beauty of the Jura mountains. This event offers eight routes—5 km, 9 km, 15 km, 23 km, 36 km, 50 km, 70 km, and the demanding 106 km Ultra—featuring dirt paths, forest trails, gravel climbs, and steep descents. The 70 km Trail de Calabri boasts around 3,600 m of vertical gain, while the Ultra covers nearly 5,000 m D+ over two stages. With certified routes, dramatic scenery, and the prestige of serving as the Swiss Trail Running Championships, it draws elite athletes and passionate trail runners alike. Every race offers a unique balance of athletic endurance, scenic immersion, and Swiss mountain culture.
Races
106 km
70 km
50 km
36 km
23 km
15 km
9 km
5 km
Race Date:
18 April, 2026
The flagship 106 km is run over two days (18–19 April 2026) by combining the 36 km Trail de Pietchiesson + 70 km Trail de Calabri for about 4,990 m D+; it’s organized by the volunteer team behind Les Courses du Mont-Terrible / Club d’Athlétisme de Fontenais in Fontenais, Canton of Jura, Switzerland.
Race Date:
18 April, 2026
The 70 km Trail de Calabri unfolds on 18 April 2026, organized by the Club d’Athlétisme de Fontenais, offering a rugged ultra‑trail circuit through technical Jura terrain with heavy elevation gain.
Race Date:
18 April, 2026
On 18 April 2026, runners can test themselves on the 50 km Trail d’Outremont, traversing wild single-track and forest paths, hosted by Club d’Athlétisme de Fontenais.
Race Date:
19 April, 2026
Held on 19 April 2026, the 36 km Trail de Pietchiesson challenges intermediate‑level trail runners on scenic, technical terrain around ruined castles and wooded climbs.
Race Date:
18 April, 2026
Also on 18 April 2026, La Terrible, a 23 km mountain trail, delivers sharp climbs and rewarding views—ideal for experienced yet adventurous runners.
Race Date:
19 April, 2026
The 15 km La Brère takes place on 19 April 2026, offering a shorter, punchy trail experience on rolling Jura paths—great for trail enthusiasts.
Race Date:
19 April, 2026
Scheduled for 19 April 2026, the 9 km La Fontenelle delivers a beginner‑friendly trail run close to nature and perfect for a fast, sprint finish.
Race Date:
19 April, 2026
Also on 19 April 2026, the 5.6 km La Tchouatte provides a scenic and accessible introduction to trail running, blending forest paths with gentle elevation.
Weather based on historical averages.
FAQs
What is the Ultra Trail du Mont-Terrible 106km?
How long is the Ultra Trail du Mont-Terrible 106km?
Where does the Ultra Trail du Mont-Terrible 106km take place?
What is the elevation gain of the Ultra Trail du Mont-Terrible 106km?
How can I prepare for the Ultra Trail du Mont-Terrible 106km?
How do I choose the right training plan for the Ultra Trail du Mont-Terrible 106km?
The flagship 106 km is run over two days (18–19 April 2026) by combining the 36 km Trail de Pietchiesson + 70 km Trail de Calabri for about 4,990 m D+; it’s organized by the volunteer team behind Les Courses du Mont-Terrible / Club d’Athlétisme de Fontenais in Fontenais, Canton of Jura, Switzerland.
The Ultra Trail du Mont-Terrible 106km is 106km long.
The Ultra Trail du Mont-Terrible 106km takes place in Fontenais, Canton of Jura, Switzerland.
The Ultra Trail du Mont-Terrible 106km elevation gain is 4990 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 Ultra Trail du Mont-Terrible 106km?
The flagship 106 km is run over two days (18–19 April 2026) by combining the 36 km Trail de Pietchiesson + 70 km Trail de Calabri for about 4,990 m D+; it’s organized by the volunteer team behind Les Courses du Mont-Terrible / Club d’Athlétisme de Fontenais in Fontenais, Canton of Jura, Switzerland.
How long is the Ultra Trail du Mont-Terrible 106km?
The Ultra Trail du Mont-Terrible 106km is 106km long.
Where does the Ultra Trail du Mont-Terrible 106km take place?
The Ultra Trail du Mont-Terrible 106km takes place in Fontenais, Canton of Jura, Switzerland.
What is the elevation gain of the Ultra Trail du Mont-Terrible 106km?
The Ultra Trail du Mont-Terrible 106km elevation gain is 4990 metres, which Runna classifies as a Hilly race.
How can I prepare for the Ultra Trail du Mont-Terrible 106km?
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 Ultra Trail du Mont-Terrible 106km?
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 Trail de Calabri 70km?
How long is the Trail de Calabri 70km?
Where does the Trail de Calabri 70km take place?
What is the elevation gain of the Trail de Calabri 70km?
How can I prepare for the Trail de Calabri 70km?
How do I choose the right training plan for the Trail de Calabri 70km?
The 70 km Trail de Calabri unfolds on 18 April 2026, organized by the Club d’Athlétisme de Fontenais, offering a rugged ultra‑trail circuit through technical Jura terrain with heavy elevation gain.
The Trail de Calabri 70km is 70km long.
The Trail de Calabri 70km takes place in Fontenais, Canton of Jura, Switzerland.
The Trail de Calabri 70km elevation gain is 3630 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 Trail de Calabri 70km?
The 70 km Trail de Calabri unfolds on 18 April 2026, organized by the Club d’Athlétisme de Fontenais, offering a rugged ultra‑trail circuit through technical Jura terrain with heavy elevation gain.
How long is the Trail de Calabri 70km?
The Trail de Calabri 70km is 70km long.
Where does the Trail de Calabri 70km take place?
The Trail de Calabri 70km takes place in Fontenais, Canton of Jura, Switzerland.
What is the elevation gain of the Trail de Calabri 70km?
The Trail de Calabri 70km elevation gain is 3630 metres, which Runna classifies as a Hilly race.
How can I prepare for the Trail de Calabri 70km?
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 Trail de Calabri 70km?
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 Trail d' Outremont 50km?
How long is the Trail d' Outremont 50km?
Where does the Trail d' Outremont 50km take place?
What is the elevation gain of the Trail d' Outremont 50km?
How can I prepare for the Trail d' Outremont 50km?
How do I choose the right training plan for the Trail d' Outremont 50km?
On 18 April 2026, runners can test themselves on the 50 km Trail d’Outremont, traversing wild single-track and forest paths, hosted by Club d’Athlétisme de Fontenais.
The Trail d' Outremont 50km is 50km long.
The Trail d' Outremont 50km takes place in Fontenais, Canton of Jura, Switzerland.
The Trail d' Outremont 50km elevation gain is 2490 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 Trail d' Outremont 50km?
On 18 April 2026, runners can test themselves on the 50 km Trail d’Outremont, traversing wild single-track and forest paths, hosted by Club d’Athlétisme de Fontenais.
How long is the Trail d' Outremont 50km?
The Trail d' Outremont 50km is 50km long.
Where does the Trail d' Outremont 50km take place?
The Trail d' Outremont 50km takes place in Fontenais, Canton of Jura, Switzerland.
What is the elevation gain of the Trail d' Outremont 50km?
The Trail d' Outremont 50km elevation gain is 2490 metres, which Runna classifies as a Hilly race.
How can I prepare for the Trail d' Outremont 50km?
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 Trail d' Outremont 50km?
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 Trail de Pietchiesson 36km?
How long is the Trail de Pietchiesson 36km?
Where does the Trail de Pietchiesson 36km take place?
What is the elevation gain of the Trail de Pietchiesson 36km?
How can I prepare for the Trail de Pietchiesson 36km?
How do I choose the right training plan for the Trail de Pietchiesson 36km?
Held on 19 April 2026, the 36 km Trail de Pietchiesson challenges intermediate‑level trail runners on scenic, technical terrain around ruined castles and wooded climbs.
The Trail de Pietchiesson 36km is 36km long.
The Trail de Pietchiesson 36km takes place in Fontenais, Canton of Jura, Switzerland.
The Trail de Pietchiesson 36km elevation gain is 1360 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 Trail de Pietchiesson 36km?
Held on 19 April 2026, the 36 km Trail de Pietchiesson challenges intermediate‑level trail runners on scenic, technical terrain around ruined castles and wooded climbs.
How long is the Trail de Pietchiesson 36km?
The Trail de Pietchiesson 36km is 36km long.
Where does the Trail de Pietchiesson 36km take place?
The Trail de Pietchiesson 36km takes place in Fontenais, Canton of Jura, Switzerland.
What is the elevation gain of the Trail de Pietchiesson 36km?
The Trail de Pietchiesson 36km elevation gain is 1360 metres, which Runna classifies as a Hilly race.
How can I prepare for the Trail de Pietchiesson 36km?
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 Trail de Pietchiesson 36km?
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 La Terrible 23km?
How long is the La Terrible 23km?
Where does the La Terrible 23km take place?
What is the elevation gain of the La Terrible 23km?
How can I prepare for the La Terrible 23km?
How do I choose the right training plan for the La Terrible 23km?
Also on 18 April 2026, La Terrible, a 23 km mountain trail, delivers sharp climbs and rewarding views—ideal for experienced yet adventurous runners.
The La Terrible 23km is 23km long.
The La Terrible 23km takes place in Fontenais, Canton of Jura, Switzerland.
The La Terrible 23km elevation gain is 850 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 La Terrible 23km?
Also on 18 April 2026, La Terrible, a 23 km mountain trail, delivers sharp climbs and rewarding views—ideal for experienced yet adventurous runners.
How long is the La Terrible 23km?
The La Terrible 23km is 23km long.
Where does the La Terrible 23km take place?
The La Terrible 23km takes place in Fontenais, Canton of Jura, Switzerland.
What is the elevation gain of the La Terrible 23km?
The La Terrible 23km elevation gain is 850 metres, which Runna classifies as a Hilly race.
How can I prepare for the La Terrible 23km?
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 La Terrible 23km?
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 La Brère 15km?
How long is the La Brère 15km?
Where does the La Brère 15km take place?
What is the elevation gain of the La Brère 15km?
How can I prepare for the La Brère 15km?
How do I choose the right training plan for the La Brère 15km?
The 15 km La Brère takes place on 19 April 2026, offering a shorter, punchy trail experience on rolling Jura paths—great for trail enthusiasts.
The La Brère 15km is 15km long.
The La Brère 15km takes place in Fontenais, Canton of Jura, Switzerland.
The La Brère 15km elevation gain is 540 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 La Brère 15km?
The 15 km La Brère takes place on 19 April 2026, offering a shorter, punchy trail experience on rolling Jura paths—great for trail enthusiasts.
How long is the La Brère 15km?
The La Brère 15km is 15km long.
Where does the La Brère 15km take place?
The La Brère 15km takes place in Fontenais, Canton of Jura, Switzerland.
What is the elevation gain of the La Brère 15km?
The La Brère 15km elevation gain is 540 metres, which Runna classifies as a Hilly race.
How can I prepare for the La Brère 15km?
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 La Brère 15km?
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 La Fontenelle 9km?
How long is the La Fontenelle 9km?
Where does the La Fontenelle 9km take place?
What is the elevation gain of the La Fontenelle 9km?
How can I prepare for the La Fontenelle 9km?
How do I choose the right training plan for the La Fontenelle 9km?
Scheduled for 19 April 2026, the 9 km La Fontenelle delivers a beginner‑friendly trail run close to nature and perfect for a fast, sprint finish.
The La Fontenelle 9km is 9km long.
The La Fontenelle 9km takes place in Fontenais, Canton of Jura, Switzerland.
The La Fontenelle 9km elevation gain is 290 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 La Fontenelle 9km?
Scheduled for 19 April 2026, the 9 km La Fontenelle delivers a beginner‑friendly trail run close to nature and perfect for a fast, sprint finish.
How long is the La Fontenelle 9km?
The La Fontenelle 9km is 9km long.
Where does the La Fontenelle 9km take place?
The La Fontenelle 9km takes place in Fontenais, Canton of Jura, Switzerland.
What is the elevation gain of the La Fontenelle 9km?
The La Fontenelle 9km elevation gain is 290 metres, which Runna classifies as a Hilly race.
How can I prepare for the La Fontenelle 9km?
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 La Fontenelle 9km?
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 La Tchouatte 5km?
How long is the La Tchouatte 5km?
Where does the La Tchouatte 5km take place?
What is the elevation gain of the La Tchouatte 5km?
How can I prepare for the La Tchouatte 5km?
How do I choose the right training plan for the La Tchouatte 5km?
Also on 19 April 2026, the 5.6 km La Tchouatte provides a scenic and accessible introduction to trail running, blending forest paths with gentle elevation.
The La Tchouatte 5km is 5km long.
The La Tchouatte 5km takes place in Fontenais, Canton of Jura, Switzerland.
The La Tchouatte 5km elevation gain is 133 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 La Tchouatte 5km?
Also on 19 April 2026, the 5.6 km La Tchouatte provides a scenic and accessible introduction to trail running, blending forest paths with gentle elevation.
How long is the La Tchouatte 5km?
The La Tchouatte 5km is 5km long.
Where does the La Tchouatte 5km take place?
The La Tchouatte 5km takes place in Fontenais, Canton of Jura, Switzerland.
What is the elevation gain of the La Tchouatte 5km?
The La Tchouatte 5km elevation gain is 133 metres, which Runna classifies as a Hilly race.
How can I prepare for the La Tchouatte 5km?
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 La Tchouatte 5km?
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
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by Les Courses du Mont-Terrible 2026 or Club d’Athlétisme de Fontenais. 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 Les Courses du Mont-Terrible 2026 website.
