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UT4M race trail training, 3 days

UT4M race trail training, 3 days

Join Caroline, UIMLA certified mountain guide, trail running during 3 days in the massifs of Vercors, Oisans, Belledonne and Chartreuse, to train for the UT4M!



4 Days

Jul, Aug

Extremely Fit



Are you planning on running the UT4M? This trail running program is ideal to train and get to know the terrain in preparation for the race! 

We will run almost 120km of the UT4M race. We will go to all the key places, reach the summits, practice the technical descents. Besides, I organized this trip with the logistics of a transfer to transport our luggage and help us if necessary.

This is the best way to get prepared for the real race, enjoying the incredible variety of landscapes and the ambiance of Vercors, Oisans, Belledonne and Chartreuse.

The highlights of this trip are:
– A chance to properly get to know the UT4M
– Advice from a professional
– Logistics: transfers, luggage transfer, accommodation, meals

In the ‘extra’ section below, you’ll find information about the required trail running level you need to have. You will also see the equipment that you need to bring with you.

During these 3 days we will run on average 35km a day and go up from 1500 to 2500 meters. We will mainly be on single tracks and technical trails (stone, névé…). We will partially run off trails and be on aerial paths.

Ready to get familiarized with the route of UT4M during 3 intense and rewarding trail running days? Then book this trip and let’s get ready for the real deal! I also offer a similar program but in preparation for the UTMB, check it out here.

Price includes

- Guiding fee


Day 1: Vercors section

We meet at 8:30AM at the Grenoble train station. Short transfer to our starting point: the Tour Sans Venin, one of the 7 Wonders of Dauphiné.
Today we will run at Vercors. St Nizier du Moucherotte, le Moucherotte (1901m), Pic St Michel (1966m), Arc pass (1736m), St Paul de Varces and Vif.
The Vercors is a vast plateau surrounded by limestone cliffs huge and majestic.
We finally reach our accommodation, a lodge where we will sleep in comfortable yurts. There is a swimming pool at the lodge!
In the evening we will do some stretching and talk about some nutrition and hydration aspects before, during and after the effort.

Distance: 26km
Min altitude: 368m
Max altitude: 1966m
Total Altitude change +2211/-2126m
Duration: 5-6hs

Day 2: Oisans section

After a short transfer, we reach the Laffrey lake. It’s a different massif with a different ambiance. We enjoy here the lakes and summits of Oisans: Alpe du Grand
Serre (1368m), Arrête de Brouffier (2350m), Poursollet lake(1649m), Fourchu lake
(2068m), and finally the descent to Rioupéroux.
We finish at Bourg d’Oisans and reach the lodge, where you can get a massage or go to the spa (reservation required).
In the evening we will do some stretching and talk about training specifically for trail and ultra-trail.

Distance: 33km
Min altitude: 556m
Max altitude: 2329m
Total Altitude change +2354/-2719m
Duration: 7-8hs

Day 3: Belledonne section

Back to Rioupéroux, we face a wall this morning. It is the incredible ascent to the Arselle plateau: the vertical kilometer of the UT4M! Then the Belledonne massif appears, with lakes and summits: Achard lake (1917m), Croix de Chamrousse (2253m), Roberts lake(1998m), Longet lake (2027m) and Grand Colon (2402m). Then a last long descent to Freydières (1131m) and the Grésivaudan (220m) to end the day.
After a transfer, we reach the Chartreuse, and we spend the night in a 2* hotel at the heart of the Chartreuse Park.
In the evening we will do some stretching and talk about the complete trail.

Distance: 32km
Min altitude: 250m
Max altitude: 2362m
Total Altitude change +2423/-2759m
Duration: 7-8hs

Day 4: Chartreuse section

After a short transfer to St Nazaire les Eymes, we start ascending the Chartreuse, the Emerald of the Alps according to Stendhal.
Through green forests, we traverse the Faïta pass (1425m), Chamechaude (2082m), Porte pass (1327m), Sappey en Chartreuse (1000m), Fort du St Eynard and finally Vence pass (782m).
Transfer to the Grenoble train station, that we reach around 6PM.

Distance: 27km
Min altitude: 455m
Max altitude: 2015m
Total Altitude change +2216/-1850m
Duration: 6-7hs




Lodge and hotel.

More info

Clients are required to have a multi-risk insurance, covering cancellation fees, rescue and accident, repatriation and baggage loss or theft.

(Reconnaissance UT4M)

Level: - Regular practice of running and other activities: 4-5 times / week for at least 1:15h - Regular running in varied terrains - Regular mountain hiking - Experience in mountain trails at least 40km long and 2000m D+, and being able to run at least at 800mD+/h during 1h. - Knowledge of the mountain environment

Equipment: - During the day: a light backpack with a waterproof jacket, a long sleeve warm fleece type, a survival blanket, a whistle, an individual pharmacy kit*, a cap or headband, a hat and thin gloves, sunglasses suitable for running, long tights if you are wearing shorts to run, cereal bars and energy drinks, a plastic bag for waste, biodegradable toilet paper, a headlamp, a minimum reserve water of 1.5L, an elastic strapping strip and some cash - To wear: running short, a short-sleeved t-shirt, running socks and already worn trail shoes - For the whole stay: spare clothes for 3 days, a personal hygiene kit, spare shoes, a spare water socket, spare batteries for the headlamp, a pair of spare laces, a pocketknife and earplugs - Recommended additional equipment: poles, leggings and camera * Individual pharmacy kit: anti-friction cream, sunscreen, double skin dressings, elastic band, paracetamol, anti-diarrheal, antiseptic and personal drugs

Meeting point

At the Grenoble train station. Getting there: - By car, let me know so I can guide you to leave it in a free parking - By train, TGV Grenoble station.

About the guide

I hold the State Certificate of Mountain Leader (UIMLA), Athlete of Team Garmin Adventure. I won many trail competitions such as Oxygen Challenge, The Glaciers Tour of Vanoise, Albertville Trail, Drayes Blanches of Vercors, the Frison Roche Beaufort, Run and skate of Chamonix… I have also some racing podiums such as the Saintélyon, the Lyon Urban Trail, the Causses Marathon, the Allobroges. I am an ex-sportswoman of high level in rowing (World Championships, World Cups, France Championships). I have a mastery STAPS (Sport) and BEES First degree in rowing.
I organise and supervise many trail courses in the Alps with a pro team, a friends group with whom we have a mission: Run and enjoy! I invite you to contact me if you want to train and/or discover these incredible massifs.


French | English



What people are saying about Caroline Freslon

Andrew Smith


August, 2022

The traveller did not leave a comment.

Antoine van Outryve d'Ydewalle


June, 2021

Amazing 4-days trip with Caroline!!

Plgm Freitas


August, 2019

The traveller did not leave a comment.

James Jirn


August, 2019

Great experience, but definitely favored toward elite runners. One of our guides, JC, was amazing. He cared about every runner. The other guide seemed only to care for the elites (and himself). On top of Col des Montets, I asked if we had time to put on warm layers. The guide said "of course," but then quickly proceeded to run off with the entire group while I stood bare and freezing with my gear unpacked. Total lack of consideration for the well-being of his runners. Otherwise a great tour.

Christopher Woodrow


July, 2019

Well organized tour of the TDS course. Amazing views await even if you’re not planning to run the race

Andrew Pidden


July, 2018

Awesome and very well organised

Iván Qart


August, 2017

Ha sido una experiencia inolvidable. El lugar es impresionante y el grupo de personas con el que compartí la semana eran majísimas. Los alojamientos y la comida han estado muy bien. La guía Carol excepcional. Muy simpática, atenta y con extensos conocimientos sobre la actividad a realizar y la zona. Totalmente recomendable. En cuanto pueda repetiré.

Kurt Deleu


July, 2017

Great trip. Good balanced program, valuable tips from experienced guide and breathtaking environment.



September, 2016

Mon stage initiation trail à La Plagne avec Caroline a été une très belle expérience. Son expérience sa disponibilité son sourire m'ont permis d'assimiler les bases du trail. Mes compères et moi même avons progressé jour après jour toujours dans la bonne humeur. Aujourd'hui je me sens capable de faire mes premières courses avec des bases techniques, alimentaire et de sécurité. Je compte continuer mon apprentissage avec un stage intermédiaire en 2017.



January, 2016

Pour moi le trail c'est avant tout la découverte de nouveaux territoires, les rencontres et les échanges avec d'autres passionnés, le respect de la nature. Mes 3 stages avec Caroline m'ont permis de retrouver ces fondamentaux dans un cadre toujours bon enfant, mais pas moins professionnel. Caroline est une passionnée de montagne et de tout ce qui y touche (sport, culture, gastronomie) et elle sait comme personne transmettre sa passion et ses bons conseils, toujours avec le sourire. Je garde un excellent souvenir des rencontres avec les autres stagiaires et mais aussi avec les autres encadrants, Guillaume, Seb, Cédric, Lydie et tant d'autres rencontrés au cours de ces stages.

Jean G.


January, 2016

J'ai fait deux stages avec Caro, c'est devenu une amie, et chacun de ces stages m'a laissé des souvenirs inoubliables. Le premier stage en 2014 en Haute Savoie à l'occasion du Trail du Gypaète. Le Deuxième stage en 2015, dans les Calanques de Marseille. Ces stages auront été parfaits à tous les niveaux: Paysages grandioses (on sent qu'ils ont été choisis avec soin), des échanges techniques avec des "pros" (un grand moment quand Caro inspecte les sacs à dos...), pleins de conseils nutrition - mode de vie etc... La découverte des autres stagiaires mais aussi des autres encadrants (très bon contact avec Guillaume Lenormand par ex.). Des conditions matérielles top (hébergement, repas, organisation etc...). Seule critique: le temps passe trop vite, c'est toujours trop court! Donc au final quand c'est fini, on n'a qu'une envie... c'est de repartir pour un autre stage! Et vu le nombre de personnes que l'on croise sur les stages qui en sont à leur n-ième participation, je peux affirmer que ce sentiment est partagé!

Laurent B.


January, 2016

J'ai eu l'opportunité de participer à deux stages, l'un dans le Cantal, l'autre à Chamonix. Un grand plaisir de partager une passion commune avec des participants très sympas de tous niveaux et de tous horizons. Caroline, une grande professionnelle de la montagne et du trail, n'a pas son pareil pour organiser ces rencontres, et tout cela dans une super ambiance et des paysages à couper le souffle.


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